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Slow graphics on Gigabyte GA-Z77M-D3H when accessing disk


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Hello,

 

I installed Snow Leopard 10.6.8 on a Gigabyte GA-Z77M-D3H, core i7 Ivy Bridge, nVidia 9800GT graphics card, using LegacyAppleAHCIPort.kext for SATA to be recognized, NVEnabler.kext for the nVidia card.

 

Everything is working, except I noticed the graphics are not fast as it should be - actually it's kinda choppy. The card seems to be recognized by the system, system profiler shows it as it should be, it really seems to be working fine - the thing is, the more disk access, the more slow are the graphics. Tried with an 8600GT, same thing.

 

I confess that SATA is not really my field of expertise, and I googled a lot for similar symptoms and I found nothing. If it were on a standard PC I would dare to say that the graphics card and the SATA controller are competing for the same IRQ, but this one uses UEFI and it's completely different. Am I using the wrong kext for SATA? I couldn't make it boot without so far without this one.

 

Please help!!! Many thanks.

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