Question / Help An FPS abnormality

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MrBr1ghtsid3

New Member
Sup people? Ever since I began taking interest in livestreaming, I believed firmly that a decent CPU is ALWAYS the better choice when upgrading a livestreaming dedicated machine. That might change if some of you, the more technically knowledgeable than me, can explain why after changing my GPU's, I've noticed my FPS plummet?
The details: initially, I used a Radeon Vaporx 4000 series GPU with my i5 3470 to stream 1280x720, veryfast 48fps 160k bitrate stream. It worked pretty much flawlessly. Recently, I've decided to replace the 300W VaporX with a 200W GTX 210, which is also passively cooled = less noisy. Needless to say, I've used AMD driver removing tool and all, done a clean installation of the new drivers etc etc. Then, it all began - the 48fps dipped to 36fps (an unstable 36, too).
In my honest opinion, this is a clear sign that the CPU gets extra work from something, but for the life of me, I cannot figure out what or why. Also, just so you know, the PC i'm talking about is strictly dedicated to livestreaming and I have a 2nd one to game with. Share thy wisdom with me, ye beautiful minds of the interwebz! Thank you for taking the time to read and respond!
 
Krazy

Krazy

Town drunk
Well, OBS uses the GPU quite heavily to do it's thing, and is greatly benefited by GPUs that have lots of parellel procesing power (looking for high stream processor count). The GTX 210 is an incredibly weak GPU, which is why you probably noticed the difference.

Having said that, however, the HD4000 that's on your 3470 should be more than enough to run OBS, with the added benefit of not needing a dedicated GPU. Your motherboard chipset does have to support being able to use the iGPU, however.
 
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MrBr1ghtsid3

New Member
So are you saying that if I get my hands on a new motherboard, the i5 will run obs and the rest at the same time? I mean, would NOT using a dedicated GPU further increase the stress on the CPU?
 
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Kharay

Member
No. The GPU portion of OBS will not be offloaded to the CPU in case of an absent or weak GPU. Anyhow, if you use that streaming PC just for streaming, a "modern" integrated GPU should be more than sufficient for OBS. As basically all of its processing power will be available to OBS (not running a game and all). As far as the CPU portion goes: I'm on an i5 760 and a discrete GPU (HD 6870). The 760 is a first generation i5, doesn't even have an integrated GPU and what not. And, still, the PC has little to no issue streaming. So, a 2nd/3rd gen i5 with integrated GPU should mock most of what you could ask of OBS.

Unless you're looking to stream in 1080p at 60 FPS. Which is ill advised either way, as it is far too bandwidth hungry.
 
dodgepong

dodgepong

Administrator
Community Helper
Krazy is suggesting you run OBS on your integrated GPU, if you have access to it. Not all motherboards give you access to the integrated GPU, but if you have one such motherboard, then the integrated GPU that comes with your i5 CPU should be sufficient (your particular model, at least). If you don't have access to your integrated GPU, then the suggestion is moot.

Although the lion's share of computer load goes onto the CPU during the encoding process of streaming, the GPU is still important for OBS, since OBS uses the GPU to construct the scene that the encoder is encoding. So swapping out for a weaker GPU can give you performance loss.
 
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MrBr1ghtsid3

New Member
I fully understood that. What I cannot process through my tiny brain, is how come a combo of GPU and CPU can be generally worse than a CPU only? ;D
 
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MrBr1ghtsid3

New Member
But of course! Thank you for that! I completely ignored the fact that I could be "bottlenecking" my system. Okay, back to the drawing board!
 
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