My shiny new Hackintosh https://www.tonymacx86.com/threads/...ene-i7-6700k-asus-geforce-gtx970-gigi.202270/ Hardware Overview: Model Name: Mac Pro Model Identifier: MacPro3,1 Processor Name: Intel Core i7 Processor Speed: 4.01 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 16 GB Bus Speed: 400 MHz Boot ROM Version: MP31.006C.B05 SMC Version (system): 1.25f4 has been working perfectly since final assembly and test about a week ago. It's been absolutely problem-free and every OSX app and function has "just worked". But then [cue Jaws theme]: Yesterday evening while playing a favourite game I heard audio stutter, then saw video stutter, then WHAM, crash -- not just to desktop but to a reboot (kernel panic). "That was strange," sez I, and when boot was complete I cautiously restarted the game, then played for a couple of hours without incident. Thought it might have been a power glitch or gremlins, who knows. A once-off event. But tonight, I can't do anything gpu intensive for more than a few minutes without a kernel panic: Tue Sep 27 20:48:25 2016 *** Panic Report *** panic(cpu 0 caller 0xffffff7f9721aeab): NVRM[0/2:0:0]: Read Error 0x006100c0: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xde000000 0xffffff82108ae000 0x124020a1, D0, P3/4 [...] Tue Sep 27 20:56:55 2016 *** Panic Report *** panic(cpu 6 caller 0xffffff7f8aa1aeab): NVRM[0/2:0:0]: Read Error 0x00100f04: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xde000000 0xffffff8203f8e000 0x124020a1, D0, P3/4 [...] Tue Sep 27 21:02:59 2016 *** Panic Report *** panic(cpu 0 caller 0xffffff7f8941aeab): NVRM[0/2:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xde000000 0xffffff820296e000 0x124020a1, D0, P3/4 [...] Tue Sep 27 21:12:27 2016 *** Panic Report *** panic(cpu 0 caller 0xffffff7f88f10eab): NVRM[0/2:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xde000000 0xffffff8200e7e000 0x124020a1, D0, P3/4 [...] In every case the backtrace leads to the NVIDIA driver and Apple IOKit. I can't play the aforementioned game and I can't run the Heaven benchmark any more; it runs for a while -- not a consistent length of time, but "sorta" the same length of time -- and then wham, audio glitch, audio loop, screen goes dark, crash. And the reboot about 3 out of 4 times does not succeed; I get lots of disk LED blinking but a dark screen. However if I cycle power, I get a normal boot with both screens working... so long as I just run ordinary apps that don't challenge the GTX970. Hackie seems perfectly normal so long as I don't stress the GPU. I note that my GPU temp has been reaching 70C when playing demanding game, and reached 66C before the Heaven benchmark crashed. Is this "too hot" for the GTX970? Googling around, the consensus seems to be that 70C during demanding gameplay is not unusual, and 90C is the trouble threshold. In some discussions about stock Apple Macs, I have seen advice along the lines of "disable your NVIDIA GPU and use only the native graphics." Since the whole point of my Hackie is to support the GTX970 this is not helpful I am running NVIDIA Web Driver 346.03.15f02 -- is this a dangerous revision? should I roll forward, or back, to some other release? [see below, I've tried every valid release of the web driver and nothing helps so far] Lastly I ask with dread... does this mean my expensive new Asus GeForce GTX970 is defective? What is an NVRM Read Error and whose NVRAM is being read? mobo? gpu? or does NVRM mean my M2 SSD, the system disk? What diagnostics can I use to locate the problem definitely in one component? Is this a known symptom of something such as overheating, card not properly seated, or other "dumb" physical causes that I might be able to remedy? I am about to try running Geekbench for the GPU to see if one particular test mode always causes the panic. I'm bewildered because I have not changed *anything* about my Hackie since I got it running, yet all of a sudden the kernel is panicking after just a minute or two of any graphics-intensive app. So it sounds to me like hardware failure and that means hassle and expense (sigh). POSTSCRIPT: just found a link here at tonymacx86 that might address my issue https://www.tonymacx86.com/threads/...e-to-nvidia-driver-346-03-15f02.201022/page-8 what a relief it will be if this works. will report back. UPDATE: nope, too bad. I tried (a) rolling back to 15b01, that did not stop the nvrm panic running Heaven. (b) 15f01, no good either, panic after similar number of seconds. (c) back to 15f02, no good, panic. (d) update OSX via Apple Store and try 15f03, compatible with latest patch. no good, Heaven benchmark still panics. I am now out of ideas, other than to have a long talk with my retailer. Please tell me my GTX970 is not broken... FINAL POSTSCRIPT: https://www.reddit.com/r/hackintosh/comments/4fxlow/gtx_970_panic_restarts_under_heavy_load/ This sounds similar. Should I change my system definition from MacPro 3,1 to iMac 15,1? Might this help? I also have read in one similar case a suggestion that too weak a power supply might cause the GPU to fail in this way. Does anyone think my P/S is underpowered for the configuration?