I have a workstation with two GTX 970 boards. Using Blender 2.78c, regardless of the settings under File | User Preferences:

No Cuda Use one GTX 970 Use two GTX 970s

the workstation immediately becomes unstable as soon as I try a Cycles render. This either makes the workstation unusably slow or blue screens altogether.

Are there alternatives to Cycles that work with CUDA?

System Info:

Windows 10 Pro
Version 1607
OS Build 14393.1358

Processor:   Intel Core i7-6700K @ 4GHz
System Type: 64-bit OS, x64 based processor
Installed RAM: 32 GB

Two NVIDIA GeForce GTX 970 Driver NVIDIA 2017-Feb-23


  • The NVIDIA Drive has been updated to 2017-Jun-27 version
  • The resource monitor shows CPUs at 100% as soon as a render in Cycles is initiated. (Even with both GTX 970s selected). Should the use of GTX 970s reduce the burden on the CPUs?
  • I was able to close Blender 2.78c during one test and saw CPU usage immediately drop when Blender was closed.
  • A complete hard shutdown is required after trying a Cycles render.
  • $\begingroup$ Same setup, works flawless. What OS? Latest drivers? Related: blender.stackexchange.com/a/7486/31447 $\endgroup$
    – brockmann
    Jul 8, 2017 at 14:10
  • $\begingroup$ Added system info to question. $\endgroup$ Jul 8, 2017 at 15:27
  • 1
    $\begingroup$ Try to update your drivers. February is outdated, obviously. Also windows 10 has some serious issues: blender.stackexchange.com/questions/68311/… $\endgroup$
    – brockmann
    Jul 8, 2017 at 15:50
  • 1
    $\begingroup$ Also make sure your scene is not too big or complex for your hardware and available memory. Slowness and unresponsiveness is highly probable and totally expected while rendering, especially with bigger tile sizes and the closer you get to your memory limits $\endgroup$ Jul 8, 2017 at 18:53
  • 1
    $\begingroup$ Probably worth mentioning that issues like this are usually due to drivers or hardware (ex, cooling) rather than Cycles. It is highly likely that any other CUDA-based renderer would exhibit the same issues. $\endgroup$
    – JtheNinja
    Jul 9, 2017 at 3:21


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