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Most streamers have a dedicated streaming machine or a 6/8 core processor in their gaming desktop.
https://pcpartpicker.com/list/qGYskd
Then it shouldn't have much impact and you'll be fine. The video quality of that encoder supposedly is worse than software based encoders but using a software based encoder at good quality have a decent impact even with 8 core processors and with 4 cores both your stream will drop frames and your game will run much worse. So using a software based encoder isn't really an option as is and even with a Ryzen 7 2700X you'd still have an impact.
Your graphics cards encoder you can already use but if you want to use something else / not use any part of your machine two alternative solutions it to get another secondary PC with a capture card which can grab your game play and then encode and stream that and handle your things there or simply a device made for that purpose.
The guy at "Tech Deals" on YouTube use some 4K capable streaming box for his game stream. I don't know what it cost but he can of course stream without a performance impact on his game since he use that. An external PC is just the same and I don't know how much of an impact using ShadowPlay/nvenc would result in.
However, if you use NVidia Shadowplay for streaming, you will have just fine stream quality.
But you will lack a lot of control over the stream, like proper layout, the stream stopping if you change game etc.
And maybe the Intel one too.
It may also help to set OBS affinity to 1 core (two threads) and unless Windows plus the game doesn't make it nice automatically set the game to use the other three cores.
I think one core on the 6700K is capable of pretty good video quality and then you'd have three unaffected cores for games and many games run well on dual core i3s so shouldn't that be pretty ok?
If you don't do it though maybe both programs try to use all cores and threads and Windows switch between them which get to run on each hw thread resulting in small breaks at each switch.
The "Ryzen is better for streaming talk" is basically about how when streaming at very good quality the Intel CPUs won't keep up and drop frames in the stream / not finish all in time leading to a more jerky stream than with Ryzen with more cores. However Intel run games faster and in the case of the 8700K will likely do so even when streaming. By changing affinity you can improve the quality of the Intel stream to a similar result as with Ryzen and maybe keep you own game play advantage too. It's just that it take a tiny bit of additional work.
I've done ~6000 kbps 720p 60 fps one with the 2700X. That use very little CPU capacity but the in game impact is noticable.
I haven't changed core affinity though. I'd assume on the 2700X you could put OBS on 2 cores and game on 6 cores or 5+3 o whatever and be pretty fine with it.
As for the 6700K if you run OBS on 1-2 cores and the game on 2-3 cores I think it will be perfectly fine and enjoyable for all. Or if you use the hardware encoder on the graphics card.
How much upload do you have?
And yes you need an ISP Upload speed of approx 5-10 mbps for best results; unless you want picture quality to look like crap, in which no one will even look at your channel.
Overwatch is very CPU demanding game that's why you may get stuttering, however I know few streamer that have no problem streaming games like Witcher 3 in 1080p/60fps from their PC with i7 4790K/6700K with gtx 1070.
An OC'd Pentium GOLD should be fine if he stream 1280x720p low settings (he may have low quality internet) DOTA 2 or CS:GO which are the most viewed games on streaming.
FXAA as antialiasing.
Use a cable nor Wi-Fi.
2. Not if you plan on playing anything more demanding then Hearthstone.
I find that unlikely. But it does really depend on the game, I am unsure if the Witcher 3 is CPU heavy or not. It strikes me as a more GPU heavy game.
I’m going to look into these solutions but getting a whole another pc seems a bit out of my budget. Is just getting a single capture card okay? Im also gonna look into shadowplay, etc
Try optimizing your system doing performance-only and setup your stream with low video settings and bitrate.