Why is my benchark bad? 3dmark06..

I have a gtx 280
2gb ram ddr2
Quadcore Xeon 5150 @ 2.6ghz x4
bootcamp- Vista32

My 3dmark benchmark: http://service.futuremark.com/home.action;jsessionid=BED75AD4C456F09AB5E59604D1D28570

Running at any resolution in FC2, Fallout3, and other games, they all pretty much have the same fps but on ultra high I was getting 30 fps and very high was like 35-40s.

My fps seems to go down alot and compared to other ppl with similar setups they get alot more fps. During the 3dmark test the 'gpu test' was really choppy getting like 3 fps and the cpu was also. I am just wondering, should I build a new pc with a new board and processor? Or maybe get more ram?

cpu usage goes up to 60% even 70%. But my 'physical memory' (ram) goes up to 80%-90%.

 

Ok so I used vantage instead.

These are my results: http://img75.imageshack.us/img75/8565/3dmarkin0.jpg

It says my cpu is pretty good compared to 'fast machines' but my graphics score is pretty low. Wtf? Maybe I have a bad 280?

Edit: Just realized their comparing my score to a tri-sli pc but still my score seems to be lower than it should!