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September 21, 2006 There are currently 5 major types (technologies) of computer memory
in use: This article is only focusing on the packaging intended for use
by desktop computers: DIMM/SIMM/RIMM). Notebook computers use SoDIMM and
other variants that are more compact.
DDR2 (DDR2 SDRAM) 240-pin 1
notch DIMM, and 200-pin SO-DIMM
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Specification |
Market Name |
Bus Speed |
Data Rate |
| DDR2-400 |
PC2-3200 |
200MHz |
3.200GB/s |
| DDR2-533 |
PC2-4200 |
266MHz |
4.267GB/s |
| DDR2-667 |
PC2-5300 |
333MHz |
5.333GB/s |
| DDR2-800 |
PC2-6400 |
400MHz |
6.400GB/s |
DDR (Double Data Rate SDRAM)
184-pin 1 notch DIMM, and 200-pin SO-DIMM
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Specification |
Market Name |
Bus Speed |
Data Rate |
| DDR-200 |
PC-1600 |
100MHz |
1.600GB/s |
| DDR-266 |
PC-2100 |
133MHz |
2.133GB/s |
| DDR-333 |
PC-2700 |
166MHz |
2.667GB/s |
| DDR-400 |
PC-3200 |
200MHz |
3.200GB/s |
SDR (Single Data
Rate SDRAM) 168-pin 2 notches DIMM, and 144-pin SO-DIMM
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Specification |
Market Name |
Bus Speed |
Data Rate |
| PC-66 |
PC-66 |
66MHz |
528MB/s |
| PC-100 |
PC-100 |
100MHz |
800MB/s |
| PC-133 |
PC-133 |
133MHz |
1.064GB/s |
RDRAM (Rambus)
184-pin RIMM
EDO/FPM DRAM
(Extended Data-Out/Fast Page Mode DRAM)
Memory Glossary:
SIMM: Single in-line memory module
DIMM: Dual in-line memory module
SO-DIMM: Small outline dual in-line memory module
DDR: Double Data Rate
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