GTX 560 poor performance Mac Pro 4.1 Yosemite

[YURII]

Hey there, after upgrading from Mavericks to Yosemite, I encountered a significant drop in overall performance with my gigabyte gtx 560. Nvidia drivers doesn't work (its stuck on grey screen upon restart). Would really appreciate if someone could suggest a noob tutorial or give me an advice how to make this card run faster with some tweaks or something! Thank you!

 

[YURII]

Could someone please help?

 

[MacVidCards]

Your post is confusing, are you saying it doesn't work at all or has poor performance? You should probably post in the sticky thread at top of page.

FWIW, I happened to try some 560 cards last night in Yosemite and they didn't work.

 

[YURII]

Yup, Im running native yosemite drivers and it is laggy, like with the GT120 which comes with 2009 mac pro. To be honest I was using the wrong DVI port it seems when I tried it with NVIDIA drivers, thats why it was showing a white screen upon startup. Still Im confused, because the same card was working fine running Mavericks native drivers.