What RAM did the old Pentium I MMX processors use?

[lchyi]

Uh, I guess I should type something here. Hehe. Thanks for your help in advance.

 

[mechBgon]

Some PentiumMMX systems used DIMMs of either EDO or SDRAM, and some used paired SIMMs of EDO or Fast Page. If you have a PentiumMMX system now, you can spot SIMMs quite easily just by their short length compared to a DIMM (such as is in your Yellow Submarine system). They're about an inch shorter in length.

 

[ChefJoe]

My lappy (ThinkPad 380D - Pentium 1 MMX) uses the small EDO.

 

[Peter]

Processors don't "use" RAM. Chipsets do. (Exception: AMD Opteron)

So it all depends on what chipset is in that machine. It might use FPM/EDO, or SDRAM. Also depending on the chipset, there might be both capabilities. The chipset also might impose size limitations on RAM sticks.

 

[pspada]

Whichever one it is, I have bags of the SIMMs for it, if you are interested. Usually, FPM/EDO, or SDRAM all work - as long as you don't mix types. So, all FPM or EDO is fine, but half and half would not run properly. And you did not push the modules in like you do with DIMMs, you would put them in at an angle, and then raise them to click them into place.

 

[Peter]

FPM and EDO are mixable.

 

[pspada]

Sure, the system will boot and run if you mix FPM and EDO, but it induces errors that eventually cause system and/or data problems.

 

[Peter]

No it doesn't. All the chipsets from back then could run FPM and EDO mixed, bank for bank. I'm 100 percent sure since I've been involved in designing mainboards back then already.
Populating one single bank with one FPM and one EDO SIMM is Not Good though. You need to use an identical pair - but what you do in the next bank doesn't matter then.

Mixing SDRAM with EDO and/or FPM is what absolutely doesn't work.