What are DIMM modules?

DIMMs (Dual In line memory modules) have a wide path for data written to, refreshed and read from. A DIMM connector may accept EDO, FPM, or SDRAM DIMM modules.

168-pin DIMM modules are 64 bit and 72 bit, so your mainboard can use single modules. Just as SIMMs can be single sided or double sided, DIMMs can also be manufactured this way.

 

SIMM

DIMM

100 mm

133.3 mm

5 Volts

3.3 Volts

4 bytes

8 bytes

EDO/FPM

SDRAM/EDO/ECC, EDO/FPM

Asynchronous

Synchronous

72 pins

168 pins

No Host Clocks

2 Host Clocks or 4 Host Clocks

Buffered of Unbuffered

What are the different types of DIMM modules on the market?

The current standard for the PC DIMMs is 3.3 V Unbuffered DIMM. Also see, PC100 compliant SDRAM.

Motherboard

DIMM Module
PC66

DIMM Module
PC100

3.3v SDRAM

3.3v SDRAM

Abit BX6

Yes
with PII 233-333

Yes
with PII 233-450

Abit BH6

Yes
with PII 233-333

Yes
with PII 233-450

AOpen AX6B

Yes
with PII 233-333

Yes
with PII 233-450

Atrend ATC-6220

Yes
with PII 233-333

Yes
with PII 233-450

ASUS P2B series

Yes
with PII 233-333

Yes
with PII 233-450

ASUS P5A series

Yes
when running system bus at 66 MHz

Yes

Intel SE440BX

Yes
when running system bus at 66 MHz

Yes
with PII 233-450

Epox EP-58MVP3C-M
EP-51MVP3E-M

Yes

Gigabyte GA-5AX

Yes
when running system bus at 66 MHz

Yes

Gigabyte 686BX

Yes
with PII 233-333

Yes
with PII 233-450

Gigabyte 6BA

Yes
with PII 233-333

Yes
with PII 233-450