If you just got the board recently, then you might want to look into some good Winbond CH5 RAM (something like Corsair XMS). I have read from many sources that the newer versions of the NF7-S have been optimized for CH5 RAM instead of the higher performing BH5. If it's an older board, try and find some BH5 (Mushkin Level II, Kingston Hyper-X 3200 Non-A) or BH6 (Mushkin 2-2-2 Special, OCZ PC3200 EL Limited Edition). Eother of those two chips will work well with the older 2.0 boards.