A 3DMark06 score of about 4000 with that setup is not too low depending on your settings. Mine was about 4500 when I had the single 7900GT KO before I went to two 7900GT KOs in SLI. The 4500 was with AA and AF turned on as high as it would go, so if you are running the same settings you should expect about that score (yours should be lower then mine as I have a 4400+ OCed to 2.4GHz). Expect to get a higher score with the AA and AF settings off. 3DMark06 is a very, very demanding test, especially in the CPU test. There could be background apps slowing your system down, higher AA and AF settings making your score lower or it could just be the Pine Technologies (Pine is a bottom of the barrel, low end PC components maker that uses the alias XFX to hide their true name, manufacturer) video card that is slowing things down and making your score lower. But it's probably just 3Dmark06 being very demanding.