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Memory and motherboard, ok to have different types?

Last response: in Motherboards
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Anonymous
a b V Motherboard
a b } Memory
December 18, 2008 1:34:18 PM

Hello there!

I currently have a Asus P5W DH Deluxe motherboard with Corsair XMS2-5400 TWIN2X2048 memory (2GB).

Now I'd like to expand and get some more memory, however, I can't help to wonder if it is OK to mix types.

Example: Would it be ok for me to buy Corsair TWIN2X 6400 DDR2, 4096MB CL5, so I get a total of 6 GB? Also, the specs are slightly different, (PC5400 vs PC6400). I also read somewhere that you need to have an OS that is 64-bit in order to run RAM over 4 GB, is this true?

Best regards, Thomas.
a b V Motherboard
December 18, 2008 1:55:58 PM

If you mix different speeds, it should all run at the lowest of both.

Moreover, since all modules are not of the same size, your board might revert back to single-channel (instead of dual). If placed correcly (3GB per channel), some boards will be able to run in dual channel.

Finally, yes you need a 64 bits OS to use more than 4GB.
!