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mixing DDR RAM?


Active Member
I'm about to upgrade my main PC and was wondering about dual channel RAM, specifically, can I use the 2x256MB sticks I have now with another 2x 512MB sticks to get 1.5GB of dual channel memory or do all 4 sticks have to match?


The Dude

Distinguished Member
dont quote me on this :devil: but i'm fairly sure as long as the two channels match you should be ok.


Active Member
well, i'll probably just give it a go as i'm getting a pair of 512s any way, if the 256s work then fine. if not, ebay :)


Well-known Member
That sounds about right to me, each memory channel (i.e. one pair of DIMM sockets) has to comprise the same RAM modules, but the channels themselves can differ.

I have an nforce NF7-S which only has 3 dimm sockets, but you can put a single 512 in socket 1 (a single socket channel) and pair it with 2x256 in the other 2 sockets (a 2-socket channel) to make up 1Gb.


Distinguished Member
On some motherboards, using all 4 DIMM slots can result in reduced Mhz, sometime as low as 166mhz.

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