4850x2 in x4 performance?

I have an Asus P8P67-LE, and recently discovered that I have a bad PCIEx16 slot. My other slot works fine, but I'm pretty sure that it will only run at x4. How much will this hurt gaming performance? It seems to run Crysis 1 just fine. I don't have a lot of graphically demanding games right now, but I probably will in the future. Basically, will I need to replace my motherboard if I want to run anything newer? I'm using a Radeon 4850x2 for my graphics.
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More about 4850x2 performance
  1. I don't have any hard numbers, but have seen multiple times that x8 is the minimum to not result in degraded performance. That being said, I have 4870s in crossfire at x16/x4...
  2. Depends on the game. The 4x slot isn't too bad since it's 2.0 and it's got a decently fast link to the CPU, but not ideal.
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