Vegas Pro 15 and GTX 1080Ti performance drop??

cyvideo wrote on 7/18/2018, 8:53 AM

VP 15 build 361 was using the GTX 1080Ti beautifully at Best / Full on 4K. Running at 23.976 no problems. Now all of a sudden it won't play any better than 1-6fps at Preview / Half. This all off a 2TB dedicated video drive. Cleaned out and reinstalled Nvidia drivers 398.36, uninstalled v15 b361 and reinstalled it and no improvement? Previously VP15 would use around 40-60% GPU. Now it wont go above5-8%. Any ideas anyone? Tested 1080 GPU with Heaven Benchmark 4.0 and it's running beautifully at an average 248fps with 98% GPU utilization so the 1080Ti is fine. Davinci Resolve also running beautifully at 4K with anywhere between 40-80% GPU. VP15 suddenly dropped the bundle!

i7 8700k, GTX 1080Ti, 32 Ram, Win 10

Thanks in advance

Chris

Comments

AlesCZ wrote on 7/19/2018, 3:02 PM

I have a 1080 card and I use Vegas without GPU acceleration. It's faster, but still slow (with Blackmagic ProRes and 32bit project settings)

cyvideo wrote on 7/19/2018, 8:56 PM

Thanks for feedback but I have now discovered what happened.

As I said the timeline performance was great with Best / Full performance with 4k LOG footage with LUTs and grades applied then all of a sudden it dropped to 1-6 fps. Something had gone wrong. This is what I discovered. In BIOS I had enabled the on board IGPU that the newer i7's have. This is the Intel UHD Graphics 630 GPU on the 8700k. I wanted to be able to access Intel's QuickSync. After enabling QuickSync Vegas 15's Nvidia performance when the GTX 1080Ti was selected just didn't perform as it had previously. Sure I now had access to QuickSync but somehow enabling Intel QS had somehow impacted the Vegas / Nvidia GPU interaction. The next step was to go back into BIOS and turn off the Intel iGPU 630 engine. After rebooting I was hoping that the previous good performance that Vegas had displayed with the Nvidia card would be restored. No this was not the case, the GTX 1080Ti just continued to stagger along slowly. Double checking the Preferences / Video tab did confirm that the 1080Ti was selected and that the Intel 630 was no longer an option. Yet even with the Intel QS option now disabled the Nivida / Vegas performance was now irreparably damaged. I then took the extreme step of doing doing a fresh Win 10 install. I then installed the Nvidia drivers v398.36 and Vegas 15 build 384. The previous great 4k Best / Full performance was now back and working beautifully. Obviously this Intel / Nvidia / Vegas interaction needs to be investigated further. I will feed this back to the Beta team.

Chris

Former user wrote on 7/20/2018, 3:07 AM

I then took the extreme step of doing doing a fresh Win 10 install. I then installed the Nvidia drivers v398.36 and Vegas 15 build 384. The previous great 4k Best / Full performance was now back and working beautifully. Obviously this Intel / Nvidia / Vegas interaction needs to be investigated further. I will feed this back to the Beta team.

Chris

I think vegas themselves may have found this fault themselves as I also had a older version of vegas working fine until *somthing* happened & for months it never used my nvidia gpu. It wasn't until the latest version of windows 10 installed (1803) I tried installing latest version of vegas (384) & nvidia GPU worked fine again.

The difference is that I still have intel GPU enabled in bios & intel quick sync drivers installed. What is different is that I no longer have the magix AVC Quicksync hardware encode option where previous I did. Also I can still choose intel gpu in vegas video preferences. That seems to indicate Vegas turns off QSV hardware rendering when it detects both gpu's & that solves the gpu problem.

cyvideo wrote on 7/20/2018, 7:12 AM

Thanks for you experience Bob. It's all grist to the mill and just goes to show what works on one box often doesn't on another.

I'm also on Win 10, build 17134.165 and there is no way I can have Quicksync enabled on my 8700k in BIOS without screwing the Nvidia / Vegas GPU relationship. To try and get around this situation as an experiment I tried three times after enabling the Intel GPU in BIOS and with each new installation if the Intel GPU was on in BIOS and the Intel drivers were installed it killed the performance of the Nvidia GPU. The good Nvidia performance could not be recovered by turning off the Intel GPU and uninstalling the Intel drivers. The only thing that fixed it each time was going through the Update & Security menu using the "Reset this PC" option. Well I couldn't be bothered going through the full Reset option again for the 4th time so I'm just going to do away with the Quicksync encode option for the time being. Happy to do that to keep the very good Best / Full performance on 4K with the 1080Ti.

A weird one indeed. Don't you just love these diagnostic sessions... not!

Chris

Shinra Bansho wrote on 7/20/2018, 7:39 PM

@cyvideo, I read your post with a keen interest because I had gone through almost the same process as you did although I am an AMD card user and things may be a little different. I do not know what your motherboard is and how multiple GPUs are handled but, in my case, a change to the BIOS setting on "Internal Graphics" seemed to solve all the issues I had suffered. Now I can use QSV and VCE without an issue (albeit this is still an initial test result and more tests are deemed necessary). In any case, I wrote about this in the following thread if you're interested.

https://www.vegascreativesoftware.info/us/forum/vegas-pro-15-update-5-build-361-general-discussion--111550/?page=13#ca692923