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GTX 660 bad performance on Mavericks

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I found the solution but I've not tried it.
It seems that is a problem related to cpu power management. I want underline that ALL people have that problem in 10.9.1 and later. Also in mac edition cards and also in real Mac Pro computer.

solution here

http://forum.netkas.org/index.php/topic,8206.180.html

cit."
Ok, so, just remove these two and get fine perf:

AppleIntelCPUPowerManagement.kext:
AppleIntelCPUPowerManagementClient.kext:


Using them from d21 makes them not loaded, equal to removing them


So prolly on macpro3,1 CPU isn't working at proper speed when opencl needs it.
"
 
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