| You shouldn't have any problems on the K8N, as long as that is your exact board. It has 3 DIMM slots, and all can run different sizes.
On some boards, with 4 slots, usually capable of dual channel (socket 939 and later for AMD), 3 sticks wont work.
__________________ 
Silverstone ST405, AMD64 3500+ Winchester, Gigabyte GA-K8NXP-SLi,
4x512MB Generic, Palit 8600GT Super, 120GB WD SATA, 2x 320GB Seagate, Asus LightScribe DVDRW |