# Problem transcode Nvidia GTX
**URL:** https://community.wowza.com/t/problem-transcode-nvidia-gtx/37210
**Category:** Wowza Streaming Engine
**Created:** [February 17, 2014, 4:54pm UTC](https://community.wowza.com/t/problem-transcode-nvidia-gtx/37210 "2014-02-17T16:54:03Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Cesar\_Garcia](https://community.wowza.com/u/Cesar_Garcia)
#### Post date: [February 17, 2014, 4:54pm UTC](https://community.wowza.com/t/problem-transcode-nvidia-gtx/37210/1 "2014-02-17T16:54:03Z")
Hi all
I am trying to get hardware acceleration with Nvidia GTX660 and NVEC:
**In logs i can see:**
INFO server comment - JNI:TranscoderSession.isCUDAAvailable[_defaultVHost_:rtvcnet/_definst_/rtvcnet.stream]: NVidia NVENC hardware acceleration is available
INFO server comment - JNI:NVidiaCUDAUtils.logCUDAGPUInfo[_defaultVHost_:rtvcnet/_definst_/rtvcnet.stream]: GPU[0]: name:“GeForce GTX 660” version:3.0 driver:6000 memory:2047MB processors:5 cores:960 clockRate:1032MHz NVENC:yes
INFO server comment - JNI:TranscoderSession.isQuickSyncAvailable[_defaultVHost_:rtvcnet/_definst_/rtvcnet.stream]: Intel Quick Sync hardware acceleration is NOT available.
**But later i obtain:**
INFO server comment - JNI:TranscoderSession.videoEncoderAdd[_defaultVHost_:rtvcnet/_definst_/rtvcnet.stream:360p]: Create video encoder: H.264: NVENC
File: nvenc/src/CNVEncoder.cpp, Line: 1783, nvEncOpenEncodeSessionEx() returned with error 21
Note: GUID key may be invalid or incorrect. Recommend to upgrade your drivers and obtain a new key
NVENC error at nvenc/src/CNVEncoder.cpp:1785 code=21(NVENC Feature not available for current license key type) “nvStatus”
WARN server comment - JNI:VideoEncoderH264NVENC.initialize[_defaultVHost_:rtvcnet/_definst_/rtvcnet.stream:360p]: OpenEncodeSession failed: gpuid:0 result:-1
Where is the problem? i just spent 1000€ on hardware.
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### Author:  [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)
#### Post date: [February 17, 2014, 8:42pm UTC](https://community.wowza.com/t/problem-transcode-nvidia-gtx/37210/2 "2014-02-17T20:42:58Z")
Hi,
The error you are seeing may very well be a driver issue.
However, Wowza uses the NVidia NVENC SDK to implement this type of hardware accelerated transcoding.
The consumer level GTX GPUs are not on NVidia’s[list of GPUs supported](https://developer.nvidia.com/nvidia-video-codec-sdk#gpulist) for use with the NVENC SDK.
It’s not advisable to use these GPUs for this purpose.
Daren
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### Author:  [@Thomas\_Gires](https://community.wowza.com/u/Thomas_Gires)
#### Post date: [February 23, 2014, 10:44am UTC](https://community.wowza.com/t/problem-transcode-nvidia-gtx/37210/3 "2014-02-23T10:44:11Z")
AFAIK NVENC in Wowza will work with Quadro class GPUs, even if a GTX has NVENC, I suppose it is a more basic/crippled version (otherwise why would anyone want to buy Quadros?)