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I have an HP d530 SFF desktop PC.

It was running as a test box and has 1.5 GB RAM. I just opened the lid and
noticed that there are three 512 RAM chips:

1 x PC2100R
1 x PC2700U
1 x PC3200U

Three different speeds for memory chips in the same PC, but the PC seems to
run ok. Can they all run ok together?

Jim

Jim wrote:
> I have an HP d530 SFF desktop PC.
>
> It was running as a test box and has 1.5 GB RAM. I just opened the lid and
> noticed that there are three 512 RAM chips:
>
> 1 x PC2100R
> 1 x PC2700U
> 1 x PC3200U
>
> Three different speeds for memory chips in the same PC, but the PC seems to
> run ok. Can they all run ok together?
>
> Jim
>
>

They will be run, at the speed of the slowest one. A PC3200 DIMM, can
run slower than that, and can run all the way down to PC1600 if necessary.

I notice one of your part numbers ends in an "R" and the others are "U".
A possible meaning for "R" is registered. And the "U" could be unbuffered.
Generally, only one type of RAM should be used at a time. I don't remember
seeing any PCs that mix the RAM types.

Everything in the list here, is unbuffered.

http://www.crucial.com/store/listpar...l+Form+Factors

Paul