needles27 wrote: I did do a clean install of Lion, but to be honest, I don't think that was necessary. I am on a MacPro 4,1 with 32 GB of RAM and a nVidia GTX 285. I don't have the driver numbers in front of me, but they are the latest available - both card and CUDA drivers. More questions: When you nuked your system from orbit and installed Lion from scratch, did you also upgrade to 10.7.1 (recent release)? I assume you downloaded the two image files from nVidia for the card driver and the CUDA driver installer, correct? When you ran the installer for the card (not the CUDA one), did it bitch at you and say, "Hey dummy, there's already nVidia support on this system!" and kick you out? Or did the install complete and force you to do a reboot? Here's why I ask: I'm considering picking up a Quadro 4000 for my Mac Pro. Yesterday, I DL'd the most recent nVidia drivers for the card and CUDA. All of my Macs are running the updated 10.7.1 Lion, for what it's worth. Upon trying to install the nVidia drivers, I got that message. Bear in mind: I'm running an 'old' 3,1 Mac Pro which has the nVidia 8800GT in it. But according to the installer, it didn't need to run. The CUDA installer ran fine, however. The interesting note here is that, according to the CUDA driver, my system has a newer nVidia driver on it than what's available for download through their web site. 270.05.05f01 according to the CUDA screen here. But the retail download from nVidia is still 256.02.25f1v1. I'm just kicking around ideas here, trying to figure out what the problem is, not necessarily how to fix it. I'm wondering if people with Mac Pro 4,1 and 5,1s with the stock ATI cards were or are having this problem? I'm just wondering: is it ultimately an nVidia driver issue at hand here? While they're renown for making superb cards, nVidia is also infamous for their horrendous driver writing. I wonder if 10.7.1 finally has good nVidia drivers here, and why when Butch runs it on his ATI-powered iMacs, he doesn't see the problem? Hm. jas
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