Originally posted by: SeanRinVA
WRONG!!!
Dual Channel means that if you have matched pairs, you will see an improvement in performance. You can absolutely run with 3 DIMMs. It's not something that is recommended because you will not see the performance boost of Dual Channel, but it can definitely be done.
Recommendation - go w/ 2 1GB DIMMs, preferably Corsair or Crucial.
Athlon 939's memory controller WILL NOT tolerate 3 DIMMs.
Quote from DFI NF4 Ultra manual.
Q: Why will the board fail to boot when 3 Dimms re used?
A: The integrated memory controller in AMD's 64-bit socket 939 series CPU supports dula channel however the controller is not capable of accurately distinguishing detween dual and single channels resulting to boot up problem. If you have luckily booted the system, the total memory size detected is from 2 Dimms only, not 3. Therefore we do not suggest using 3 Dimms.
Going to be the same for all S939 boards.
As for 1GB modules,
Patriots are good.