Poor memory performance?

[uncoolfish]

Hi, I recently got a new shuttle SN85G4V3. It has a nforce3 250 chipset, and I am running an athlon 64 3000+ (newcastle) in there. I got 1gb (2x512mb) kingston hyperX memory (running at 2-3-2-6-1T), and I only get 3000MB in sandra memory benchmark. That seems a bit low right? I know that newcastle has a single channel memory controller, could this be the thing holding it back? Other than that, I can't see what could be wrong... Thanks in advance for any help!