HD 4850 problems

I have a xfx hd 4850 xxx and it have problems booting it gives no video for the firts 10 seconds and the it gives video I have noticed that in some games it have very low fps like dirt 2 and f1 2010 gives only 12fps and that in gpu-z it says that the pcie bus speed is x1 could that be the problem i tried my 8600gt and it gives fullx16 and boots normal

my specs
E3300 @ 3.0
2gb ram 800mhz
80gb hard drive
650watts psu
biostar g31m7te motherboard
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More about 4850 problems
  1. Your card is probably defective,RMA it(if it's still under warranty)
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