I currently have an Asus K8N-E Deluxe (for 754) mobo it's 8x AGP and 3 ram slot but currently only have two 512MB muskin's in them. I'm looking at getting a new mobo for my 754, one that has PCIe as those cards are about half of there AGP counter parts and I'd get a newer chipset out of it. Anyway most the newer mobos I look at that are socket 754 with PCIe but only 2 ram slots (most I see). I recently ran this program that came with my curret mobo and after starting the computer and letting it sit for 10mins I ran this program and it showed before I did anything the ram was already at 44% usage! and this is 1GB of ram! So I believe I could use 2GB of ram as I game and have alot running in the background (most seem to be norton (big surprise I know) and x-fi software) but I'm also looking to spend as little as possible. So the real point of this thread is, with a new mobo with only 2 slots would/could I run it with one 512MB stick and one 1024MB stick for a total of 1536Mb of ram. or would I be better off (or have to) by two 1GB sticks for it to work correctly? I've always bought in pairs b4 but the different between 1536MB of ram and 2048MB of ram is about $70 or so now.