I could be wrong but I don't think you can. All the memory will run at the same speed. Anyone else................ :?: I think if the speed of one set is faster or has different timings than the other set it would not work right.
Thanks for the posts people!
It seems all RAM defaults to the slowest stick.
I'll need to replace my slow DD2 800 RAM and get 4 gigs of high-speed RAM when ready to upgrade.
So, the moral is: If you care about overclocking, get good RAM !! I thought even cheap DD2 800 RAM can reach 400 Mhz with mild timings and high voltage. I was wrong. Don't skimp on RAM.
You can mix RAM on different channels.
I would put the faster RAM in channel zero.
Not sure if you will get any benefit. All the memory might run at the lowest speed of the two.
You think the if I had 2x 1 gig and 1x 512. I should put the 512m stick on one channel and the 2x 1 gig sticks on the second channel. It seems impossible to get a dual-channel benifit with these sticks. (unless I remove the 512m stick)