Help for MSI 790FX-70GD & Sapphire 4890 Toxic Problem

So I have a Sapphire 4890 Toxic and I'm using ATI driver 10.1 (problem occurs with older drivers if I revert back), as well as a Phenom II x4 955 and a MSI 790FX-70GD (1.8 BIOS). I've noticed that my FPS have dropped a little and I can't seem to OC as high as I used to (previously 1050/1140, now I'm barely stable at 985/1100). My Vantage scores have dropped from 12-13k(stock-OCed) down to 10k(stock and OCed) and I don't know what's wrong. I did notice that during idle, CPU-Z/GPU-Z/Everest read that I'm at PCI-E 2x v1.1 speed, while during load, I'm at PCI-E 2x v2.0 speed. My motherboard supports 16x/16x/8x/8x and both PCI-E 16x slots report the same thing. Am I facing a problem here or what?

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More about help 790fx 70gd sapphire 4890 toxic problem
  1. Well after a few days of searching, I found out that reseating the GPU reverted it back to it's 16x speed.
  2. people reported dropped scores in the new 10.1 catalyst driver. you can go back to 9.12
  3. Hmm, well I can OC back up to 1050/1130 on stock voltages now, but my Vantage score is still at 10.2k regardless of stock or OCed clocks. I'm probably being limited by Win7. I remember there was a recent article in THG that mentioned lower 2D performance with Win7. Having previously used Win7 RC, my scores would be 12k @ stock and 13k OCed, but ever since I've installed Win7 Professional during December, my scores have been rather low.

    EDIT: Btw, I've tried using 9.7,9.9,9.12, and 10.1 drivers and I'm still stuck at 10k.
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