I have four 184 pin-DIMM sockets Supports Dual Channel DDR 400 ECC/non-ECC un-buffered memory Suppports up to 4GB RAM Existing Memory is OCZ DDR PC-3200 / 400MHz / Value Series / Dual Channel . New memory is Micron/Crucial 1GB PC2700UNBUFF PBF /333Mhz This would make a total of 3GB and totally populate the MBD with 4 sticks. I spent$70 (if I get the rebates) for the new 2GB of memory. Questions: 1. Do I keep the faster 400MHz 1GB memory in Bank A 2. Do I need all 400MHz memory? (I can return the new stuff) 3. Can I overclock any of this if it is better matched? Any comments appreciated. This is a noobe post. (My first post.) MY motherboard is ABIT KN8 SLI(NF-CK804) Socket 939 AMD Athlon 64 Processor 3700+ 2200MHz THANKS ALL!