NVENC Render Incredibly slow on new machine

GeorgeG wrote on 1/9/2020, 2:16 PM

I have a new laptop, I7 9750H, GTX 1660 TI 6GB, 16GB RAM. I just edited my first video on this machine and am rendering but the NVENC encoding is terrible. It runs very fast for the first 4000-5000 frames or so, then becomes painfully slow, rendering about 1 frame per second.

I've changed a ton of settings and preferences, tried numerous different driver versions, ensured that NVIDIA control panel is running Vegas at maximum performance, etc, nothing has changed a thing. It took almost 2 hours to render a 10 minute 1080p video at 9MBPS average bitrate in Magix AVC...

I'm thinking there's some obscure setting I'm missing or something but I'm really at a loss. My old laptop which had a mobile AMD GPU with just 2gb of vram renders much faster than this, so this is incredibly disappointing.

Comments

joost-berk wrote on 1/9/2020, 2:40 PM

I have noticed the same with my new laptop. I think this has something to do with thermal throttling. This is because of the heat that the chips produce. This can be managed in workstations easily, but in a laptop this is difficult. I don't have a solution for this yet. But I keep searching!

My laptop is a Dell SPX15 7590 with a Core i9, GTX-1650ti and 32 GB RAM.

j-v wrote on 1/9/2020, 3:03 PM

@GeorgeG
Which program and buildnr.?
The Nvidia needs for Nvenc encoding and NVDEC decoding ( only VP17) this one

GeorgeG wrote on 1/9/2020, 3:07 PM

Vegas 17 Pro and I have the latest studio driver. GPU is not above 55 celsius so doubt it's thermal throttling. But Vegas isn't even putting it under any load. I have Vegas set to maximum performance in Nvidia control panel.

joost-berk wrote on 1/9/2020, 3:09 PM

I use VP17 build 387 and Nvidia Studio Driver 441.66, but this is not the issue. Believe me, it is thermal throttling. :-)

GeorgeG wrote on 1/9/2020, 3:26 PM

NVENC is putting the GPU at literally 0% load though, so it's not even doing anything at all. CPU is at 71 celsius so it's fine. I tried legacy GPU rendering with Sony AVC and with that GPU usage gets up to about 30% but NVENC should be waaaay better :(. Wondering if I should go back to Vegas 16 or something...

joost-berk wrote on 1/9/2020, 3:37 PM

@GeorgeG hmmm that is interesting... Did you test it also with the "Magix AVC" Render template?

GeorgeG wrote on 1/9/2020, 3:42 PM

@GeorgeG hmmm that is interesting... Did you test it also with the "Magix AVC" Render template?

Yeah, I've tried MAGIX AVC and HEVC with various different settings, bitrates, etc, no luck. I bought this laptop specifically to use with Vegas so the fact that my old one with a much much much much much worse GPU performs better rendering is not good. I've been unable to even finish a single render so far...

joost-berk wrote on 1/10/2020, 2:23 AM

@GeorgeG I will also test this further over the weekend with my XPS15, see if I am able to manage a solution for it. It bothers me as well.

GeorgeG wrote on 1/10/2020, 10:27 AM

@GeorgeG I will also test this further over the weekend with my XPS15, see if I am able to manage a solution for it. It bothers me as well.

I set Maximum CPU performance in Power Plan > Advanced Options to 99%. This turns off CPU turbo boost which brings the thermals way down and allows it to avoid throttling. Not an ideal solution but I was able to at least render with Intel QSV quite fast.