That mobo seems to have 4 DIMM slots (Dual Inline Memory Modules) so unless I were trying to run amazingly taxing programs, I would get 2 sticks of dual channel, 512 pc3200 DDR RAM, as you can get another two sticks of the same and get your system up to over 2 gigs of memory. For most programs, 1000 RAM is fine, so I think this should work. Two memory modules of half the capacity of one tend to work slightly faster also.