Athlon ii x4 645 bottleneck?

Does my CPU bottleneck my HD 5770s crossfire? Because I think with 2 5770s I can play ac3 on highest, or am I wrong?
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More about athlon bottleneck
  1. If you have both, the easiest way to check is to monitor the load of both the GPU and CPU during game play. If your GPU is bottlenecked, you will see the CPU Load up above 80% while the GPU is not even close to 100%.

    Ideally, you want the GPU to be hitting 100% in demanding games. If it isn't doing that, something's bottlenecking.
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