I would like to know if my new PC version of the ATI 5770 is working properly in my Mac Pro. Just installed my new (unflashed) PC single-slot version of the XFX ATI Radeon 5770 - ZMF3 Revision A.5 in my 2008 Mac Pro 3,1. It eventually booted, although without the normal Apple grey screen. It's driving an extended desktop on two Dell DVI monitors from its DVI ports and after a reboot everything seemed normal. I don't know if the mini-DisplayPort is working, or how to test it. I was able to install and run Final Cut Pro X, which I couldn't do with my Mac Pro's original ATI 2660 non-OpenCL card. But I don't know if it's working as well as the official Mac version of the card. I'd read that under 10.6.7 the 5770 ran natively without the need for flashing, but that 10.6.8 (my current version) broke some of that compatibility (maybe the DisplayPort). My principal interest is in getting OpenCL working properly. Can anyone suggest a good way to check if OpenCL is working, or a general benchmark program that might include OpenCL info? I'm not sure if I need to install extra drivers, or do some other stuff to get the card's full functionality. Thanks.