# CUDA device not detected ?! **URL:** \ **Category:** Issues\ **Created:** [October 23, 2013, 2:57pm UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715 "2013-10-23T14:57:39Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\ **Post date:** [October 23, 2013, 2:57pm UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/1 "2013-10-23T14:57:39Z")
Hello everyone, I am facing an annoying problem with **VRay RT 2.40.04** on **3ds max Design 2013 x64** : it only works on “ **cpu** ” type mode. If I switch to “**CUDA (single kernel)**” type mode, it crashes. Here is what’s written in **“V-Ray RT render server window”** : _Querying for CUDA devices_ Warning: Environment variable VRAY\_OPENCL\_PLATFORMS\_x64 not found - using all available devices Device GeForce GTX 580 has compute capability 2.0 Driver API error : 999 Driver API error : 201 Thank you in advance for your help ! ---
**Author:** ![tashko.zashev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tashko.zashev/32/275280_2.png) [@tashko.zashev](https://forums.chaos.com/u/tashko.zashev)\ **Post date:** [October 24, 2013, 8:00am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/2 "2013-10-24T08:00:08Z")
Hi, I see the graphic device is GTX 580, what is the exact Nvidia driver version installed ? Do you get the same error with very simple scene setup, just a box for an example? Is the card listed in our OpenCl device selector? Program file\Chaos Group\ V-Ray Rt for 3DS max..\Select OpenCL devices.. ---
**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\ **Post date:** [October 24, 2013, 9:42am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/3 "2013-10-24T09:42:08Z")
Hi, The driver version is 9.18.13.2018 (May 12th 2013) according to the windows device manager. I know it is not the very last one but it used to work fine until few days ago so I never felt the need to update it. I get the same error with just a simple box in the scene. And yes, my GTX 580 is listed in the OpenCL devices selector. ---
**Author:** ![tashko.zashev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tashko.zashev/32/275280_2.png) [@tashko.zashev](https://forums.chaos.com/u/tashko.zashev)\ **Post date:** [October 24, 2013, 10:59am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/4 "2013-10-24T10:59:24Z")
I see that the Nvidia driver (May 12th 2013) is a beta, would it be possible to install a stable one, form the NVIDIA Driver Downloads web site? Also before doing any RT renders, try to delete all .CLBIN files located in the local Temp folder (%temp%). ---
**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\ **Post date:** [October 25, 2013, 10:02am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/5 "2013-10-25T10:02:17Z")
Sure: can you please tell me what nVidia driver version exactly I have to install ? Also, for the .CLBIN files: I didn’t find any on my computer but maybe I didn’t searched in the right places. Can you tell me what temp folder I have to look into ? Thank you, ---
**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\ **Post date:** [October 25, 2013, 10:05am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/6 "2013-10-25T10:05:10Z")
Sorry, I just typed “%temp%” in explorer adress bar and then searched for .CLBIN: I didn’t find anything neither. ---
**Author:** ![tashko.zashev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tashko.zashev/32/275280_2.png) [@tashko.zashev](https://forums.chaos.com/u/tashko.zashev)\ **Post date:** [October 25, 2013, 11:42am UTC](https://forums.chaos.com/t/cuda-device-not-detected/46715/7 "2013-10-25T11:42:35Z")
Ok, thank you. Could you try to install GeForce 320.18 driver and if you still has problems with RT/GPU, please drop us an email to [support@chaosgroup.com](mailto:support@chaosgroup.com). So we can do a remote session and investigate directly on your machine, if it’s convenient for you.