It supports 400...I upgrading my step daughters computer with parts from me and my wifes old computer. Right after i posted this it dawned on me that the mb will have 4 slots not 2. So I will have a 1 gig 400 stick, a 1 gig 333 stick, 4 512 400 sticks to choose from to load her up. Using xp 32 bit so I know there is a limit. Only game she really plays is WoW. Rest of her stuff will be 256mb radeon x1300 and an Athlon 64 3000+.
So which combo of sticks should I use? The choice would be easy had my kingston 1 gig 400 not crapped out on me..lol