Memory

From HwB

(Difference between revisions)
Line 1: Line 1:
 
{{todo}}
 
{{todo}}
  
−
== SIMM ==
+
== DRAM ==
  
 
=== Module sizes ===
 
=== Module sizes ===
  
 
{| {{border}}
 
{| {{border}}
−
! Pins !! Data Bus Width<br />[bits]
+
! Module    !! Pins     !! Data Bus Width<br />[bits] !! Width [mm] !! Height [mm] !! Max memory !! Voltage
 
|-
 
|-
−
| 30   || 8/9
+
| SIMM      || 30 pin    || 8/9 (non-parity/parity)    ||            ||            || 16 MB      || 5V
 
|-
 
|-
−
| 72   || 32/36
+
| SIMM      || 72 pin    || 32/36 (non-parity/parity)  ||            ||            || 128 MB    || (3.3V) / 5V
 +
|-
 +
| SO-DIMM    || 72 pin    || 32/36 (non-parity/parity)  ||            ||            || 64 MB      || 3.3V / 5V
 +
|-
 +
| SO-DIMM    || 144 pin  || 64 ?                      ||            ||            || 128 MB    || 3.3V / 5V
 +
|-
 +
| DIMM      || 168 pin  ||                            ||            ||            || 128 MB    || 3.3V / 5V
 
|}
 
|}
−
 
−
''Note: Parity vs Non-parity modules''
 
  
 
=== RAM technologies ===
 
=== RAM technologies ===
Line 20: Line 24:
 
! DRAM type !! Description !! Note
 
! DRAM type !! Description !! Note
 
|-
 
|-
−
| FPM || Fast Page Mode    ||  
+
| FPM || Fast Page Mode    ||
 
|-
 
|-
−
| EDO || Extended Data Out || 5% faster than FPM if supported  
+
| EDO || Extended Data Out || 5% faster than FPM if supported. Not available for 30 pin SIMM
 
|}
 
|}
  
−
== SO-DIMM ==
+
== SDRAM ==
  
−
SO-DIMM=Small Outline DIMM
+
SDRAM=Synchronous Dynamic RAM.
  
−
SO-DIMM is a smaller than DIMM to fit in notebooks etc.
+
SDRAM is a variant of DRAM in which the memory speed is synchronized with the clock pulse from the CPU.
 +
 
 +
This synchronization enables the SDRAM to pipeline read and write requests. Pipelining enables the SDRAM to accept commands at the same time as it is processing other commands.
 +
 
 +
Voltage: 3.3 V
  
 
{| {{border}}
 
{| {{border}}
−
! Pins !! Data Bus Width<br />[bits]
+
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s]
 
|-
 
|-
−
| 72  || 32
+
| PC66        || 10ns      || 66                    || 66                  || 533
 
|-
 
|-
−
| 144  || 64
+
| PC100      || 8ns      || 100                    || 100                  || 800
 
|-
 
|-
−
| 200  || 72
+
| PC133      || 7.5/7ns  || 133                    || 133                  || 1,066
 
|}
 
|}
  
−
== DIMM ==
+
{| {{border}}
 +
! Module    !! Pins    !! Data Bus Width<br />[bits] !! Width [mm] !! Height [mm] !! Power dissipation !! Max memory !! Usage
 +
|-
 +
| DIMM     || 168 pin ||                            ||    133.35 ||      31.75 ||                  || 1024 MB    || Desktop computers
 +
|-
 +
| DIMM LP  || 168 pin ||                            ||    133.35 || 28.58-22.86 ||                  || 1024 MB    || Desktop computers?
 +
|-
 +
| SO-DIMM  || 144 pin ||                        64 ||      67.6 ||      31.75 ||                  || 512 MB    || Notebook computers
 +
|-
 +
| MicroDIMM || 144 pin ||                            ||        38 ||          30 ||                  || 512 MB    || Notebook computers?
 +
|}
  
−
DIMM modules are sold according to clock speed (MHz), bus speed (mega-transfers per second), and transfer rate (megabytes per second).
+
* Registred/Unregistred
 +
* ECC/Non-ECC
  
−
=== SDR SDRAM DIMM/SO-DIMM ===
+
=== 168 pin DIMM ===
  
−
SDRAM=Synchronous Dynamic RAM.
+
It is possible to determine the configuration of the DIMM by examining the placement of notches on the bottom of the DIMM.
−
 
+
−
SDRAM is a variant of DRAM in which the memory speed is synchronized with the clock pulse from the CPU.
+
−
 
+
−
This synchronization enables the SDRAM to pipeline read and write requests. Pipelining enables the SDRAM to accept commands at the same time as it is processing other commands.
+
−
 
+
−
3.3 V
+
  
 
{| {{border}}
 
{| {{border}}
−
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s]
+
|+DIMM Notch Key One
−
|-  
+
|-
−
| PC66       || 10ns      || 66          || 66        || 533
+
! Position !! Meaning
−
|-  
+
|-
−
| PC100      || 8ns      || 100        || 100      || 800
+
| 1       || Reserved
−
|-  
+
|-
−
| PC133      || 7.5/7ns  || 133        || 133      || 1,066
+
| 2        || Buffered
 +
|-
 +
| 3        || Unbufered
 
|}
 
|}
 +
  
 
{| {{border}}
 
{| {{border}}
−
! Module  !! Pins
+
|+DIMM Notch Key Two
 
|-
 
|-
−
| DIMM    || 168 pin
+
! Position !! Meaning
 
|-
 
|-
−
| SO-DIMM || 144 pin
+
| 1        || 5.0V (unusual?)
 +
|-
 +
| 2        || 3.3V
 +
|-
 +
| 3        || Reserved
 
|}
 
|}
  
−
=== DDR SDRAM DIMM/SO-DIMM ===
+
== DDR SDRAM ==
  
 
DDR SDRAM=Double Data Rate SDRAM.
 
DDR SDRAM=Double Data Rate SDRAM.
Line 81: Line 101:
 
DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.
 
DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.
  
−
2.5V
+
Voltage: 2.5V
  
 
{| {{border}}
 
{| {{border}}
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
−
|-  
+
|-
 
| PC1600      || DDR200    || 100        || 200      || 1,600  || <sup>1)</sup>
 
| PC1600      || DDR200    || 100        || 200      || 1,600  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2100      || DDR266    || 133        || 266      || 2,133  || <sup>1)</sup>
 
| PC2100      || DDR266    || 133        || 266      || 2,133  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2400      || DDR300    || 150        || 300      || 2,400
 
| PC2400      || DDR300    || 150        || 300      || 2,400
−
|-  
+
|-
 
| PC2700      || DDR333    || 166        || 333      || 2,667  || <sup>1)</sup>
 
| PC2700      || DDR333    || 166        || 333      || 2,667  || <sup>1)</sup>
−
|-  
+
|-
 
| PC3000      || DDR366    || 183        || 366      || 2,933
 
| PC3000      || DDR366    || 183        || 366      || 2,933
−
|-  
+
|-
 
| PC3200      || DDR400    || 200        || 400      || 3,200  || <sup>1)</sup>
 
| PC3200      || DDR400    || 200        || 400      || 3,200  || <sup>1)</sup>
−
|-  
+
|-
 
| PC3500      || DDR433    || 216        || 433      || 3,466
 
| PC3500      || DDR433    || 216        || 433      || 3,466
−
|-  
+
|-
 
| PC3700      || DDR466    || 233        || 466      || 3,733
 
| PC3700      || DDR466    || 233        || 466      || 3,733
−
|-  
+
|-
 
| PC4000      || DDR500    || 250        || 500      || 4,000
 
| PC4000      || DDR500    || 250        || 500      || 4,000
−
|-  
+
|-
 
| PC4300      || DDR533    || 266        || 533      || 4,266
 
| PC4300      || DDR533    || 266        || 533      || 4,266
 
|}
 
|}
Line 110: Line 130:
  
 
{| {{border}}
 
{| {{border}}
−
! Module    !! Pins      !! Power dissipation !! Usage
+
! Module    !! Pins      !! Width [mm] !! Height [mm] !! Power dissipation !! Max memory !! Usage
 +
|-
 +
| DIMM      || 184 pin  ||    133.35 ||      30.00 || 5.4 W            || 4 GB      || Desktop computers
 +
|-
 +
| DIMM VLP  || 184 pin  ||    133.35 ||      18.29 ||                  ||            || ?
 
|-
 
|-
−
| DIMM     || 184 pin  || 5.4 W            || Desktop computers
+
| SO-DIMM   || 200 pin  ||       67.6 ||        31.5 ||                  || 1 GB      || Notebook computers
 
|-
 
|-
−
| SO-DIMM  || 200 pin  ||                  || Notebook computers
+
| MiniDIMM  || 200 pin  ||      68.8 ||        30.0 ||                  ||           || ?
 
|-
 
|-
−
| MicroDIMM || 172 pin  ||                  || Notebook computers
+
| MicroDIMM || 172 pin  ||      38.0 ||        30.0 ||                  ||            || Notebook computers
 
|}
 
|}
  
−
=== DDR2 SDRAM DIMM/SO-DIMM ===
+
* Registred/Unregistred
 +
** Registered modules are slightly slower than non-registered modules, because the registering process takes one clock cycle.
 +
* ECC/Non-ECC
 +
 +
== DDR2 SDRAM ==
  
 
DDR2 SDRAM is the second generation of DDR SDRAM.
 
DDR2 SDRAM is the second generation of DDR SDRAM.
Line 132: Line 160:
 
{| {{border}}
 
{| {{border}}
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
−
|-  
+
|-
 
| PC2-3200    || DDR2-400  || 200        || 400      || 3,200  || <sup>1)</sup>
 
| PC2-3200    || DDR2-400  || 200        || 400      || 3,200  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2-4200    || DDR2-533  || 266        || 533      || 4,266  || <sup>1)</sup>
 
| PC2-4200    || DDR2-533  || 266        || 533      || 4,266  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2-5300    || DDR2-667  || 333        || 667      || 5,333  || <sup>1)</sup>
 
| PC2-5300    || DDR2-667  || 333        || 667      || 5,333  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2-6400    || DDR2-800  || 400        || 800      || 6,400  || <sup>1)</sup>
 
| PC2-6400    || DDR2-800  || 400        || 800      || 6,400  || <sup>1)</sup>
−
|-  
+
|-
 
| PC2-8500    || DDR2-1066 || 533        || 1066      || 8,500
 
| PC2-8500    || DDR2-1066 || 533        || 1066      || 8,500
 
|}
 
|}
Line 147: Line 175:
  
 
{| {{border}}
 
{| {{border}}
−
! Module     !! Pins      !! Width [mm] !! Height [mm] !! Power dissipation !! Usage
+
! Module       !! Pins      !! Width [mm] !! Height [mm] !! Power dissipation !! Max memory !! Usage
 
|-
 
|-
−
| DIMM       || 240 pin  ||           ||             || 4.4 W            || Desktop computers
+
| DIMM         || 240 pin  ||     133.35 ||       30.00 || 4.4 W            || 4 GB      || Desktop computers
 
|-
 
|-
−
| SO-DIMM   || 200 pin  ||       67.6 ||       30.0 ||                  || Notebook computers
+
| DIMM VLP    || 240 pin  ||     133.35 ||       18.29 ||                  ||           || Server computers
 
|-
 
|-
−
| FB-DIMM    ||           ||           ||             || 10.4 W           || Server computers
+
| RDIMM        || 240 pin  ||     133.35 ||       30.00 ||                  ||            || Desktop computers
 
|-
 
|-
−
| Micro-DIMM || 214 pin  ||      54.0 ||       30.0 ||                  || Notebook computers?
+
| SO-DIMM      || 200 pin  ||      67.6 ||      30.00 ||                  || 2 GB      || Notebook computers
 +
|-
 +
| FB-DIMM      || 240 pin  ||    133.35 ||      30.00 || 10.4 W            ||            || Server computers
 +
|-
 +
| Micro-DIMM   || 214 pin  ||      38.0 ||      30.00 ||                  ||            || Notebook computers?
 +
|-
 +
| Micro-DIMM /M|| 214 pin  ||      54.0 ||       30.00 ||                  ||            || Notebook computers? (with Mezanine socket)
 +
|-
 +
| MiniDIMM    || 200 pin  ||      68.8 ||      30.00 ||                  ||            || Notebook computers?
 +
|-
 +
| MiniDIMM    || 244 pin  ||      82.0 ||      30.00 ||                  ||            || Notebook computers?
 +
|-
 +
| VLP MiniDIMM || 244 pin  ||      82.0 ||      18.20 ||                  ||            || Notebook computers?
 
|}
 
|}
  
−
=== DDR3 SDRAM DIMM/SO-DIMM ===
+
* Registred/Unregistred
 +
* ECC/Non-ECC
 +
* Fully Buffered/Unbuffered
 +
** DDR2 modules with an integrated memory controller that helps send data in packets down the line to the CPU without any errors.
 +
** The FB-DIMM’s most noticeable feature is the Advanced Memory Buffer that separates the data into packets that are more easily handled and allow for a more error free data flow.
 +
** The FB-DIMMs have ECC or Error Checking and Correcting functionality as well.
 +
 
 +
== DDR3 SDRAM ==
  
 
Same pinout as DDR3?
 
Same pinout as DDR3?
  
−
1.5V
+
Voltage: 1.5V
  
 
{| {{border}}
 
{| {{border}}
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
 
! DIMM Module !! Chip Type !! Clock Speed<br />[MHz] !! Bus Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
−
|-  
+
|-
 
| PC3-6400    || DDR3-800  || 100        || 400      || 6,400  ||
 
| PC3-6400    || DDR3-800  || 100        || 400      || 6,400  ||
−
|-  
+
|-
 
| PC3-8500    || DDR3-1066 || 133        || 533      || 8,533  ||
 
| PC3-8500    || DDR3-1066 || 133        || 533      || 8,533  ||
−
|-  
+
|-
 
| PC3-10600  || DDR3-1333 || 166        || 667      || 10,667 ||
 
| PC3-10600  || DDR3-1333 || 166        || 667      || 10,667 ||
−
|-  
+
|-
 
| PC3-12800  || DDR3-1600 || 200        || 800      || 12,800 ||
 
| PC3-12800  || DDR3-1600 || 200        || 800      || 12,800 ||
 
|-
 
|-
Line 179: Line 226:
  
 
{| {{border}}
 
{| {{border}}
−
! Module    !! Pins      || Width [mm] || Height [mm]
+
! Module    !! Pins      !! Width [mm] !! Height [mm]
 
|-
 
|-
 
| DIMM      || 240 pin
 
| DIMM      || 240 pin
Line 196: Line 243:
 
244 pin Mini-RDIMM Form Factor ??
 
244 pin Mini-RDIMM Form Factor ??
  
−
 
+
== Rambus DRAM ==
−
==== Micro-DIMM ====
+
−
* Delivers highest memory density of all modules on smallest space
+
−
* 30% DIMM size reduction
+
−
* 35% space on board reduction compared to SO-DIMM
+
−
* JEDEC compliant
+
−
* Mezzanine connector
+
−
* 214pins, FBGA
+
−
 
+
−
Memory sizes:
+
−
* 256MB
+
−
* 512MB
+
−
* 1GB
+
−
 
+
−
Memory speed:
+
−
* PC2-3200 (DDR2-400)
+
−
* PC2-4200 (DDR2-533)
+
−
 
+
−
=== RIMM ==
+
  
 
RIMM uses Direct Rambus DRAM memory technology.
 
RIMM uses Direct Rambus DRAM memory technology.
 +
 +
Voltage: 2.5V or 1.8V
  
 
{| {{border}}
 
{| {{border}}
 
! RIMM Module        !!          !! Clock Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
 
! RIMM Module        !!          !! Clock Speed<br />[MHz] !! Transfer Rate<br />[MB/s] !! Note
−
|-  
+
|-
 
| PC600              || 16-bit  || 300                    || 1,200  ||
 
| PC600              || 16-bit  || 300                    || 1,200  ||
−
|-  
+
|-
 
| PC700              || 16-bit  || 355                    || 1,420  ||
 
| PC700              || 16-bit  || 355                    || 1,420  ||
−
|-  
+
|-
 
| PC800              || 16-bit  || 400                    || 1,600  ||
 
| PC800              || 16-bit  || 400                    || 1,600  ||
−
|-  
+
|-
 
| PC1066 (RIMM 2100) || 16-bit  || 533                    || 2,133  ||
 
| PC1066 (RIMM 2100) || 16-bit  || 533                    || 2,133  ||
 
|-
 
|-
Line 241: Line 272:
  
 
{| {{border}}
 
{| {{border}}
−
! Module      !! Pins      || Width [mm] || Height [mm]
+
! Module      !! Pins      !! Width [mm] !! Height [mm] !! Voltage !! Max memory !! Notes
 
|-
 
|-
−
| 16-bit RIMM? || 168 pin  ||           ||
+
| SO-RIMM     || 160 pin  ||     67.60 ||      31.75 ||    2.5V || 256 MB    ||
 
|-
 
|-
−
| 16-bit RIMM? || 184 pin  ||           ||       
+
| 16-bit RIMM || 168 pin  ||     133.35 ||      31.75 ||    2.5V ||            || Rare?
 
|-
 
|-
−
| 32-bit RIMM  || 242 pin  ||           ||       
+
| 16-bit RIMM  || 184 pin  ||    133.35 ||      31.75 ||    2.5V || 512 MB    ||
 +
|-
 +
| 32-bit RIMM  || 232 pin  ||     133.35 ||      34.93 ||    2.5V || 512 MB    ||
 +
|-
 +
| 64-bit RIMM  || 326 pin  ||    133.35 ||      34.93 ||    1.8V ||            ||
 
|}
 
|}
  
−
=== 168 Contact DIMM's ===
+
* C-RIMM = Continuity RIMM
 +
** Free memory slots has to be filled with C-RIMMs
  
−
The earliest DIMM's were of the 168 contact variety.  These DIMM's have come in a variety of configurations. It is possible to determine the configuration of the DIMM by examining the placement of notches on the bottom of the DIMM.
+
Q: Can I install a PC800 RDRAM in my system that already has a PC1066 RDRAM module installed?
 +
A: You can mix speeds in most systems. However the system will run at the lowest speed of RDRAM installed. In this case your system would only run at 800 Mhz.
  
−
{| {{border}}
+
Q: What are the common motherboards with RDRAM technology?
−
|+DIMM Notch Key One
+
A: Common motherboards that support RDRAM: Abit SI7, Asus P4T533, Asus P4T533C, Asus P4TE, Epox EP-4T2A3/4/+, Gigabyte GA-81HXP, Intel 850EMV2, Intel 850GB, IWILL P4R533N, IWILL PX400-SN, MSI 850Emax2 Most popular machines that take RDRAM: Dell Dimension 8100/8200/8250, XPS B866, Gateway XL700, Alienware Area-51 with Intel 850E chipset, Falcon NW Mach V with Intel 850E chipset, etc.
−
|-  
+
−
! Position !! Meaning
+
−
|-  
+
−
| 1        || Reserved
+
−
|-  
+
−
| 2        || Buffered
+
−
|-
+
−
| 3        || Unbufered
+
−
|}
+
  
−
+
Q: Can I install both ECC and non-ECC?
−
{| {{border}}
+
A: Mixing ECC and non-ECC is not recommended. If any of the modules do not support ECC, then the ECC functionality will be disabled and in some cases you may have difficulty booting your machine.
−
|+DIMM Notch Key Two
+
−
|-  
+
−
! Position !! Meaning
+
−
|-  
+
−
| 1        || 5.0V
+
−
|-
+
−
| 2        || 3.3V
+
−
|-
+
−
| 3        || Reserved
+
−
|}
+
  
 +
== Modules ==
  
 +
DIMM = D
  
 +
SO-DIMM=Small Outline DIMM
  
 +
SO-DIMM is a smaller than DIMM to fit in notebooks etc.
  
 +
 +
 +
== Time line ==
 +
* 1987: FPM
 +
* 1995: EDO
 +
* 1997: PC66 SDRAM
 +
* 1998: PC100 SDRAM
 +
* 1999: RDRAM
 +
* 1999: PC133 SRAM
 +
* 2000: DDR SDRAM
 +
* 2001: DDR SDRAM
 +
* 2002: DDR SDRAM
 +
* 2003: DDR SDRAM
 +
* 2004: DDR2 SDRAM
 +
* 2005: DDR2 SDRAM
 +
* 2006: DDR3 SDRAM
  
 
== Corsair FAQ ==
 
== Corsair FAQ ==
Line 304: Line 342:
 
=== Can I run PC1600 memory in a PC3200 computer? ===
 
=== Can I run PC1600 memory in a PC3200 computer? ===
 
Maybe?
 
Maybe?
 +
 +
 +
== Single Rank vs Dual Rank ==
 +
 +
One rank is 64 bits (ECC: 72 bits) of DRAM. Use single rank to utilize the motherboard best.
 +
Dual rank requires switching between ranks with a CS pin.
 +
 +
Mixing Single Rank and Dual Rank is generally allowed, but you might have to insert your Dual Rank modules in the first slots.
  
 
== Links ==
 
== Links ==
Line 309: Line 355:
 
* [http://www.interfacebus.com/Memory_Module_VLP_DIMM_Manufacturers.html www.interfacebus.com VLP-DIMM description]
 
* [http://www.interfacebus.com/Memory_Module_VLP_DIMM_Manufacturers.html www.interfacebus.com VLP-DIMM description]
 
* [http://www.infineon.com/upload/Document/Memory%20Products/Micro_DIMM.pdf Qimonda Product Information June 2006: Micro-DIMM]
 
* [http://www.infineon.com/upload/Document/Memory%20Products/Micro_DIMM.pdf Qimonda Product Information June 2006: Micro-DIMM]
 +
* [http://oem.vikingcomponents.com/brochure/overview.asp Viking InterWorks' memory module capacities, mechanical dimensions and performance]
  
 
[[Category:Information]]
 
[[Category:Information]]
 
[[Category:Memory]]
 
[[Category:Memory]]

Revision as of 22:27, 3 January 2007

Todo: This page needs some editing.

Contents

DRAM

Module sizes

Module Pins Data Bus Width
[bits] 		Width [mm] Height [mm] Max memory Voltage
SIMM 30 pin 8/9 (non-parity/parity) 16 MB 5V
SIMM 72 pin 32/36 (non-parity/parity) 128 MB (3.3V) / 5V
SO-DIMM 72 pin 32/36 (non-parity/parity) 64 MB 3.3V / 5V
SO-DIMM 144 pin 64 ? 128 MB 3.3V / 5V
DIMM 168 pin 128 MB 3.3V / 5V

RAM technologies

DRAM type Description Note
FPM Fast Page Mode
EDO Extended Data Out 5% faster than FPM if supported. Not available for 30 pin SIMM

SDRAM

SDRAM=Synchronous Dynamic RAM.

SDRAM is a variant of DRAM in which the memory speed is synchronized with the clock pulse from the CPU.

This synchronization enables the SDRAM to pipeline read and write requests. Pipelining enables the SDRAM to accept commands at the same time as it is processing other commands.

Voltage: 3.3 V

DIMM Module Chip Type Clock Speed
[MHz] 		Bus Speed
[MHz] 		Transfer Rate
[MB/s]
PC66 10ns 66 66 533
PC100 8ns 100 100 800
PC133 7.5/7ns 133 133 1,066
Module Pins Data Bus Width
[bits] 		Width [mm] Height [mm] Power dissipation Max memory Usage
DIMM 168 pin 133.35 31.75 1024 MB Desktop computers
DIMM LP 168 pin 133.35 28.58-22.86 1024 MB Desktop computers?
SO-DIMM 144 pin 64 67.6 31.75 512 MB Notebook computers
MicroDIMM 144 pin 38 30 512 MB Notebook computers?
  • Registred/Unregistred
  • ECC/Non-ECC

168 pin DIMM

It is possible to determine the configuration of the DIMM by examining the placement of notches on the bottom of the DIMM.

DIMM Notch Key One
Position Meaning
1 Reserved
2 Buffered
3 Unbufered


DIMM Notch Key Two
Position Meaning
1 5.0V (unusual?)
2 3.3V
3 Reserved

DDR SDRAM

DDR SDRAM=Double Data Rate SDRAM.

DDR SDRAM is an improvement over regular SDRAM, also known as SDR SDRAM (Single Data Rate SDRAM).

DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.

Voltage: 2.5V

DIMM Module Chip Type Clock Speed
[MHz] 		Bus Speed
[MHz] 		Transfer Rate
[MB/s] 		Note
PC1600 DDR200 100 200 1,600 1)
PC2100 DDR266 133 266 2,133 1)
PC2400 DDR300 150 300 2,400
PC2700 DDR333 166 333 2,667 1)
PC3000 DDR366 183 366 2,933
PC3200 DDR400 200 400 3,200 1)
PC3500 DDR433 216 433 3,466
PC3700 DDR466 233 466 3,733
PC4000 DDR500 250 500 4,000
PC4300 DDR533 266 533 4,266

Note: 1) Standardised by JEDEC

Module Pins Width [mm] Height [mm] Power dissipation Max memory Usage
DIMM 184 pin 133.35 30.00 5.4 W 4 GB Desktop computers
DIMM VLP 184 pin 133.35 18.29  ?
SO-DIMM 200 pin 67.6 31.5 1 GB Notebook computers
MiniDIMM 200 pin 68.8 30.0  ?
MicroDIMM 172 pin 38.0 30.0 Notebook computers
  • Registred/Unregistred
    • Registered modules are slightly slower than non-registered modules, because the registering process takes one clock cycle.
  • ECC/Non-ECC

DDR2 SDRAM

DDR2 SDRAM is the second generation of DDR SDRAM.

DDR2 SDRAM improves on DDR SDRAM by using differential signaling and lower voltages to support significant performance advantages over DDR SDRAM.

Differential signaling requires additional contacts, so the number of contacts on a DDR SDRAM DIMM module was raised from 184 to 240. The voltage of DDR SDRAM DIMM's was lowered from 2.5V to 1.8V. This improves power consumption and heat generation, as well as enabling more dense memory configurations for higher capacities.

1.8V

DIMM Module Chip Type Clock Speed
[MHz] 		Bus Speed
[MHz] 		Transfer Rate
[MB/s] 		Note
PC2-3200 DDR2-400 200 400 3,200 1)
PC2-4200 DDR2-533 266 533 4,266 1)
PC2-5300 DDR2-667 333 667 5,333 1)
PC2-6400 DDR2-800 400 800 6,400 1)
PC2-8500 DDR2-1066 533 1066 8,500

Note: 1) Standardised by JEDEC

Module Pins Width [mm] Height [mm] Power dissipation Max memory Usage
DIMM 240 pin 133.35 30.00 4.4 W 4 GB Desktop computers
DIMM VLP 240 pin 133.35 18.29 Server computers
RDIMM 240 pin 133.35 30.00 Desktop computers
SO-DIMM 200 pin 67.6 30.00 2 GB Notebook computers
FB-DIMM 240 pin 133.35 30.00 10.4 W Server computers
Micro-DIMM 214 pin 38.0 30.00 Notebook computers?
Micro-DIMM /M 214 pin 54.0 30.00 Notebook computers? (with Mezanine socket)
MiniDIMM 200 pin 68.8 30.00 Notebook computers?
MiniDIMM 244 pin 82.0 30.00 Notebook computers?
VLP MiniDIMM 244 pin 82.0 18.20 Notebook computers?
  • Registred/Unregistred
  • ECC/Non-ECC
  • Fully Buffered/Unbuffered
    • DDR2 modules with an integrated memory controller that helps send data in packets down the line to the CPU without any errors.
    • The FB-DIMM’s most noticeable feature is the Advanced Memory Buffer that separates the data into packets that are more easily handled and allow for a more error free data flow.
    • The FB-DIMMs have ECC or Error Checking and Correcting functionality as well.

DDR3 SDRAM

Same pinout as DDR3?

Voltage: 1.5V

DIMM Module Chip Type Clock Speed
[MHz] 		Bus Speed
[MHz] 		Transfer Rate
[MB/s] 		Note
PC3-6400 DDR3-800 100 400 6,400
PC3-8500 DDR3-1066 133 533 8,533
PC3-10600 DDR3-1333 166 667 10,667
PC3-12800 DDR3-1600 200 800 12,800
PC3-14900 DDR3-1866 233 933 14,930
Module Pins Width [mm] Height [mm]
DIMM 240 pin
SO-DIMM 200 pin 67.6 30.0
Micro-DIMM 214 pin 54.0 30.0
  • VLP DIMM [Registered / Unregistered]: 8.3mm [H] x 133.35mm [L] [Height x Length]
  • VLP FB-DIMM: 18.29mm [H] x 133.35mm [L] [Height x Length]
  • VLP Mini-DIMM: 18.28mm [H] x 82mm [L] [Height x Length]

VLP DIMMs 184-pin, 240-pin, VLP MiniDIMM; 244-pin

244 pin Mini-RDIMM Form Factor ??

Rambus DRAM

RIMM uses Direct Rambus DRAM memory technology.

Voltage: 2.5V or 1.8V

RIMM Module Clock Speed
[MHz] 		Transfer Rate
[MB/s] 		Note
PC600 16-bit 300 1,200
PC700 16-bit 355 1,420
PC800 16-bit 400 1,600
PC1066 (RIMM 2100) 16-bit 533 2,133
PC1200 (RIMM 2400) 16-bit 600 2,400
RIMM 3200 32-bit 400 3,200
RIMM 4200 32-bit 533 4,200
RIMM 4800 32-bit 600 4,800
RIMM 6400 32-bit 800 6,400
Module Pins Width [mm] Height [mm] Voltage Max memory Notes
SO-RIMM 160 pin 67.60 31.75 2.5V 256 MB
16-bit RIMM 168 pin 133.35 31.75 2.5V Rare?
16-bit RIMM 184 pin 133.35 31.75 2.5V 512 MB
32-bit RIMM 232 pin 133.35 34.93 2.5V 512 MB
64-bit RIMM 326 pin 133.35 34.93 1.8V
  • C-RIMM = Continuity RIMM
    • Free memory slots has to be filled with C-RIMMs

Q: Can I install a PC800 RDRAM in my system that already has a PC1066 RDRAM module installed? A: You can mix speeds in most systems. However the system will run at the lowest speed of RDRAM installed. In this case your system would only run at 800 Mhz.

Q: What are the common motherboards with RDRAM technology? A: Common motherboards that support RDRAM: Abit SI7, Asus P4T533, Asus P4T533C, Asus P4TE, Epox EP-4T2A3/4/+, Gigabyte GA-81HXP, Intel 850EMV2, Intel 850GB, IWILL P4R533N, IWILL PX400-SN, MSI 850Emax2 Most popular machines that take RDRAM: Dell Dimension 8100/8200/8250, XPS B866, Gateway XL700, Alienware Area-51 with Intel 850E chipset, Falcon NW Mach V with Intel 850E chipset, etc.

Q: Can I install both ECC and non-ECC? A: Mixing ECC and non-ECC is not recommended. If any of the modules do not support ECC, then the ECC functionality will be disabled and in some cases you may have difficulty booting your machine.

Modules

DIMM = D

SO-DIMM=Small Outline DIMM

SO-DIMM is a smaller than DIMM to fit in notebooks etc.


Time line

  • 1987: FPM
  • 1995: EDO
  • 1997: PC66 SDRAM
  • 1998: PC100 SDRAM
  • 1999: RDRAM
  • 1999: PC133 SRAM
  • 2000: DDR SDRAM
  • 2001: DDR SDRAM
  • 2002: DDR SDRAM
  • 2003: DDR SDRAM
  • 2004: DDR2 SDRAM
  • 2005: DDR2 SDRAM
  • 2006: DDR3 SDRAM

Corsair FAQ

I've heard of PC1600 and PC2100. What does this mean, and what is the difference? Well, it's kind of like PC100 and PC133. Since it is double datarate, you might expect that DDR would be PC200 and PC266. In fact, the RAM chips themselves are sold as PC200 and PC266. HOWEVER, us module guys did not want you to think that Rambus (at 800 MHz) is four times as fast as PC200 DDR. So, we went with a number that reflects the MODULE bandwidth. Since DDR DIMMs are eight bytes wide, the designation becomes PC200*8 = PC1600 and PC266*8 = PC2100. So, to repeat, PC1600 uses both edges of a 100MHz clock, and PC2100 uses both edges of a 133MHz clock. And now, you're only a little less confused than me!

FAQ

Can I run PC3200 memory in a PC1600 computer?

Yes. Underclocking at PC1600 speed is alright.

Can I run PC1600 memory in a PC3200 computer?

Maybe?


Single Rank vs Dual Rank

One rank is 64 bits (ECC: 72 bits) of DRAM. Use single rank to utilize the motherboard best. Dual rank requires switching between ranks with a CS pin.

Mixing Single Rank and Dual Rank is generally allowed, but you might have to insert your Dual Rank modules in the first slots.

Links

Retrieved from "http://www.hardwarebook.info/index.php?title=Memory&oldid=7614"