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How to identify the Type of Memory your Computer Needs

Memory Module Types

30 Pin SIMM

The 30 Pin SIMM was the first generation of the SIMM memory family.

They are typically found in older Intel 286 and 386 desktop computer systems. They come in both 8 bit and 9 bit (parity) configurations, with memory ranges of 256K to 8 megabyte, 60ns to 80ns and are  5 Volts only. The DRAM types supported are mostly Page Mode and Nibble Mode DRAM which comes in both DIP, PLCC and SOJ packages.

72 Pin SIMM

The 72 Pin SIMM was the second generation of the SIMM family.

They are typically found in the Intel 486, 486DX, 586 and some early Pentium desktop computer systems. They come in both 32 bit and 36 bit (parity) configurations, with memory ranges of 4, 8, 16 and 32 megabytes. These were normally produced in two voltage, 5V and 3.3V, and theirs speeds ranged from 60ns to 70ns.

Both Fast Page Mode (FPM) and Extended Data Out (EDO) were standard DRAM types offered in 72 pin configurations. Dram chip packaging consisted of DIP, PLCC and SOJ packages.

168 Pin DIMM

The 168 PIN DIMM is what is found in most desktop computers today.

Early on there were three memory types offered in the 168 Pin DIMM form factor, FPM, EDO and Synchronous DRAM (SDRAM). Their configurations include 64bit, 72bit and 80Bit, ECC and Non-ECC, and memory sizes included 16, 32, 64, 128, 256, 512 and 1,024 megabytes. Available voltages included 3.3v and 5v for FPM and EDO, and 3.3v for  SDRAM.

Features added to later versions of the168 Pin DIMM family were the inclusion of a serial EEPROM called the "Serial Presence Detect" which contains information about the module type. Some of the later versions of the SDRAM modules (usually higher cost modules) could reach a maximum frequency of 150Mhz. Present day SDRAM technology has passed this 150 MHz range. Later generations of the 168 Pin DIMM became available as Registered DIMM's or Buffered DIMM's for high-end workstations and servers and Un-buffered DIMM's for most personal computers. There are many variants to be found with 168 Pin DIMM's, as they are the current popular form factor. The post popular of these today are the PC 100 and PC 133 varieties. 

72 Pin SODIMM

72 Pin SODIMM's are typically found in Pentium II Laptop computer. They come in 64 bit configurations, with memory ranges of 8, 16 and 32 megabyte. These modules are designed around lower power consumption and only one voltage is offered, FPM and EDO at 3.3v. FPM and EDO are the standard DRAM types offered and the packaging is referred to as SOJ.

144 Pin SODIMM

144 Pin SODIMM's are typically used in PC 66 and PC 100 SDRAM Laptop compatible computers. It comes in both 64 bit and 72bit ECC versions and the memory ranges were 16 to 256 megabyte. The SDRAM chips used in 144 Pin SODIMM's are typically SDRAM in the form of TSOP packaging and available in 3.3v only.

100 Pin DIMM

100 Pin DIMMs are primarily used in printers. It comes in both 64 bit and 72bit ECC configurations, and is available in memory ranges of 16 to 128 megabytes. The SDRAM chips used on the 100 Pin DIMM are typically SDRAM in TSOP packaging. Both FPM and EDO were/are used in 100 Pin DIMM.

184 Pin RIMM

The 184 pin RIMM is used on motherboards using the latest Intel i820/i840 chipsets and is referred to as Rambus. The 184 pin RIMM module comes in both 16bit and 18bit ECC configurations, operating frequencies of 600MHz, 700MHz and 800 MHz and are available with memory ranges of 64 through 512 megabytes. The Rambus packaging is referred to as the Ball Grid Array (BGA) form factor. The Rambus modules only require 2.5 volts. There is a 1 GHz Rambus chip under development that was slated for release in 2001.

184 Pin DIMM

DDR SDRAM is the newest of the memory types under development that will be available in the 184 Pin DIMM form factor. The principle difference between conventional SDRAM and DDR SDRAM is its ability to read/write data on both edges of a clock, therefore resulting in faster data transfer. DDR SDRAM will be available in two frequencies, 200Mhz and 266Mhz, and operational voltage is 2.5v. There is speculation (these have not been released to manufacturing as of this writing) that these modules will be available in both 64 bit and 72bit ECC configurations, with memory ranges of 64 megabytes through to 1 gigabyte. The DDR SDRAM chips used are of the TSOP package.

200 Pin SODIMM

The 200 Pin SODIMM module comes in both 64 bit and 72bit ECC configurations, with memory ranges of 64 megabyte through 512 megabyte. DDR SODIMM modules are slated for use in next-generation DDR Laptop applications. The DDR SDRAM chips used on the 200 DIMM are typically in TSOP packaging.

Chip's ID Type size
(if known)
312804CT3A-260 PC-100
5264805FTTA60 PC-100 64 Mib X
81F16822B102FN PC-100
81F64842B-103FN PC-100
CSH64V0808T4 PC-100 64 Mib
D4564841G5-A10B-9JF PC-66 16 Mib
D4516821AG5-A10-7JF PC-100 64 Mib
D4564841G5-A10-9JF PC-100 64 Mib
D4564841G5-A80-9JF PC-100 64 Mib
GM72V16821BJ-16K PC-66
GM72V16821CT10K PC-66 16 Mib X
GM72V66841CT10K PC-66
GM72V66141CT-10K PC-66
GM72V16821DT-7K PC-100
GM72V661641CT7J PC-100
GM72V66841CT7J PC-100 64 Mib
GM72V66841ET7KAG5 PC-100
HM5216805TT10H PC-66
HM52164165TT-B60 PC-100
HM5264805TT-B60 PC-100
HM5264805CTT-B60 PC-100
HY57V168010ATC-10 PC-66
HY57V168010BTC-10 PC-66
HY57V168010CTC-10 PC-100
HY57V168010CTC-10S PC-100 16 Mib
HY57V651620ATC-10P PC-100 16 Mib
HY57V65800ALTC-10P PC-100
HY57V658020TC-10 PC-66
HY57V658020-10 PC-66
HY57V658020-11 PC-66
HY57V658020-12 PC-66
HY57V658020ATC-10S PC-100 64 Mib
HY57V658020ATC-10P PC-100
HY57V658020BTC-10P PC-100 64 Mib
HYB39S16800AT-8 PC-100 64 Mib
HYB39S16800AAT-8 PC-100
HYB39S64800AT-8 PC-100 64 Mib
HYB39S64800BT-8 PC-100
HYB39S64800CT-8 PC-100
ISGD08C2434MT PC-100
KM4... all see http://www.chipmunk.nl/DRAM/Samsung.html
KM416S4030BT-G10 PC-66
KM416S4030CT-GL PC-100 64 Mib X
KM48S2020BT-G12 PC-66 16 Mib X
KM48S2020CT-G10 PC-66 or PC-100 16 Mib X
KM48S2020CT-G8 PC-100
KM48S8030AT-F10 PC-66
KM48S8030BT-F10 PC-66
KM48S8030BT-G8 PC-100
KM48S8030BT-GH PC-100
KM48S8030BT-GL PC-100
KM48S83CT-GH PC-100
KSV884T4A1A-07 PC-133 64 Mib
M2V64S30BTO PC-100
M5M4V16S30CTP PC-66
M5M4V16S30BTP-10 PC-66
M5M4V64S30ATP-10 PC-66
M5M4V16S30DTP-8 PC-100
M5M4V64S40ATP-8 PC-100
M5M4V64S30ATP-8 PC-100
MT48LC2M8A1-10 PC-66 16 Mib
MT48LC2M8A1-10S PC-66 16 Mib X
MT48LC2M8A1-8B PC-100
MT48LC2M8A1TG-10S PC-66
MT48LC8M8A2TC-10 PC-100
MT48LC2M8A2-8E PC-100
MT48LC8MBA2-75B PC-133
MT48LC8M8A2-75C PC-133
MT48LC8M8A2-7EC PC-133
NP33S886400K-8 PC-100
NT56V6610C0T-75S PC-133
P2V64S30BTP PC-100 or PC-133
PQ3S88S8 PC-133
S133K800AT-7A PC-133
SDS82V6684157-6K PC-133
SM39S64800AT-7A PC-133
TBS6408B4E-6 PC-133
TC59... all see http://www.chipmunk.nl/DRAM/Toshiba.html
TC59S1608AFT-10 PC-66 16 Mib X
TC59S6404FTL-80H PC-100
TC59S6408BFT-80 PC-100 64 Mib
TC59S6408CFT-80 PC-100
TC59S6408FT-10 PC-66
TC59S6408FTL-80H PC-100
TC59S6416BFT-80 PC-100
TC59S6416FTL-80H PC-100
TM31S06584BP-7H PC-100
TMS... all see http://www.chipmunk.nl/DRAM/Texas.html
TMS3816B4E-7 PC-100 64 Mib
TMX626812BDGE5M PC-100
TMX664814A81A7ET PC-100
TSV884T4ATA PC-100
V54C365804VBT8PC PC-100
V54C365804VCT8PC PC-100 64 Mib
VC532881FT-8 PC-100
VG3617801BT-10 PC-66 16 Mib
VG36648041BT-8H PC-100
VTMS8M8-75 PC-133
W986408BH-8H PC-100 64 Mib
W986408CH-75 PC-133