GT240 poor OpenGL results on SL10,6,8

[abds69]

Hello guys, i'm running a Gigabyte P55M-UD4 with a i7-860 and a patched DSDT with an GT240. Everything fine, no graphics problem, QE/CI ok, CUDA ok, video smooth...
Installed CUDA 5,0, nvidia retail 256 driver.
Applegraphicspowermanagement.kext removed.
gigabyte GT240 1GB DDR5 silent

But in CINEBENCH R11,5, i'm making only 13,5 fps against 33,78 fps under Windows 7 ????
I think the card does not reach max clock in test and i know that someone in forum declared realizing more than 25 fps in mac os X.
Could these persons tell me which kexts are installed, which driver they used, did they customize something....
In Windows 7, i monitor :
GPU clock 270 Mhz -->1330
MEM -->1701 MHz
GPU graphics clock 135MHZ -->549MHz
In mac, i saw GT240 processor going to 100% , but with what clock ?
Also Win 7 show me in cinebench SSE2, although in Mac version Only OpenGL driver.

I'm stuck...please help !

 

[abds69]

I launch CUDA-Z on both platform, Win and mac. The boottleneck is in host to device and device to host (pinned), half in mac and about 5500 in Win. How to optimize this...

 

[abds69]

OK found something, when i move the card on second slot on my G P55M-UD4, which is a x8 pcie slot, CUDA-Z is windows become the same as Mac, so in ML 10.8.2 my PCIe x16 work as an x8 !!!!
Is it a bios config set to auto which didn't correctly initialized ? Is it a DSDT bad parameters ? Is it a kext or nvidia driver forcing x8 for stability ?

Thanks for help, 1 week on that problem for now !!!

 

[abds69]

Finally got the point, forced in PCIE 1.0 because may graphic card has no EFI mac. Even with the retail 10.8.2 nvidia driver, still staying in PCIE 1.0 ie 2.5 GT/s.
Any clue to gain PCIE 2.0 !!!!