I have the same problem. My 8800gt & q6600 went on my EP45-UD3P v1.0 and my 10.7.4 has been running perfect since 10.5.3. Then I bought a xfx 6870 and had a qx9650 which gave me the same issues with windows of apps englarging slowly just as the same as in About Mac in the apple menu. Then i returned and bought a evga 570gtx and again same issues. Even with 10.8. I've tryed npci=0x3000, pciuidroot-1. I think it has to with my cpu.
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