Need Help on a "New" built

I built a new PC and it works well!
But here is my Question? I have a "PowerColer Radion 6450 2gb Video card!
(My Setup)
Asus motherbroad FM1
8gb G-Skill
A6-3500 cpu
128 ssd plexor
128 ssd Oz
plus two "7200" hhd's

Now! back to the Video Card, in windows 7 my preformance is (4.5) for this card.
Can anyone tell me why this? am i doing something wrong? my Video Card can't be that bad can it?

 

Thanks, i know its not the most powerful, but heres the thing, i had a 4250 and it came up as 5.9/8 and when i ghanged it the D-- thing went down not the same but down and i just wondered why..The 4250 had DDR3 (1gb) and this card has DDR3 at 2gb,You would thank it would at least stay the same if not go up 1,2 or???

 

i dont think the memory has much to do with it ,its the clock speed that matters the more mhz the better

 

The HD6450 is at the very bottom end of the pack. It's the slowest new card you can currently buy.