Question / Help DOOM (2016) Impossible to stream/record

SGT.Hartman.

New Member
Hello everyone.

I got a really surprising issue recently, I streamed DOOM with my old config, which was:

Windows 10 64bit
i5-3570K
8Gb RAM
GeForce 660Ti

And I was streaming no problem at all. Then I upgraded my RAM to 16Gb and added a second 660Ti in SLi with a more powerful PSU.
Everything works smoothly, and I usually have no problem at all with streaming or gaming. But then I tried to stream DOOM again.
As soon as I set the game capture to DOOM. The game that I usually play at 60FPS drops to 9FPS. Even in the menu. I don't have to stream or record for this to happen, only OBS has to be open and game capture set to the game and boom unplayable.

I contacted Bethesda support about the issue and they gave me some things to try like playing in borderless window (which I already did), run steam, the game and OBS as administrator. Double check that the game was using the right GPU, I tried to run the game on Vulkan and OpenGL, double checked all my drivers etc... Not a single thing worked. And they kind of gave up on my issue.

So I was wondering maybe the problem comes from OBS, I tried to record locally just for the test and post my logfile here. During the recording I started the game with OBS running and game capture set to another game (which wasn't running). When in DOOM, switch the game capture to DOOM. Experience the drop in framerates ingame and stopped the recording.

So if someone has any kind of idea on how to fix this, the game is a lot of fun to stream and play. I'd like to keep doing it.

Here is my logfile: http://pastebin.com/xwSdiEyK
 

Harold

Active Member
On your system, using two video cards in SLI actually halves the available bandwidth for OBS and Doom on your video card.

You basically need to be running an x99 based system in order to avoid this.
 

SGT.Hartman.

New Member
Thanks for the answer!
I'm a bit lost though, what is a x99 system? Also how my GPU has an effect on the bandwidth? I'm a bit confused. OBS is using my integrated Intel GPU to encode so it shouldn't be affected by my SLi.

Edit: I only have this issue with this game in particular. I can play and stream way better looking games than this with no issue at all.
 
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Harold

Active Member
Scene composition still happens on your main video card (and cannot be split between the cards in sli mode) The added bandwidth use of that over and above what the game itself is already using is enough to put it over the pci-e x8 limit into needing pci-e x16.

X99 based systems are enthusiast-grade systems. High end i7 processors with 28 or 40 pci-e lanes. Your system only has 16 pci-e lanes TOTAL.

Try without the second video card.
 
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