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GTX 670 Working in PCIE 1.0 mode on 2.0 motherboard

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Hi everyone, 
First of all I apologize if there is similar thread, I tried to google my problem but  I didn't found anything.
I sucessfully installed Mavericks on my AMD PC which  has : FX 8320 GIGABYTE 990XA-UD3 and Asus GTX 670. 
I noticed something wears - in Cinebench in Windows GPU result is 90 fps and on OSX its 45. Then I tried using AMD HD6850 and results were interesting - 75 in Windows and 71 in OSX , so it's not AMD kernel problem.  I tried latest NVIDIA drivers for 10.9.5 but it didn't fixed the problem. Some people said that changing   smbios from 3,1 to 4,1 or 5,1 would fix the problem, so I tried that, but it didn't help.  Maybe it's DSTD problem, i'm bad at that stuff so i think I got that thing wrong.
I'm uploading my IOReg, maybe someone could figure out how to make PCIE work in 2.0 mode.

WideKing’s Mac Pro.zip

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