I wouldn't waste my time on chinese knockoffs if I were you, especially when you can get genuine parts, there's no knowing if the same might happen with the cheap one, the genuine seem to be a bit more sturdy than the cheap one.
There are now 2 revisions of the normal Aorus card and the Extreme Aorus:
The old normal one had a slight overclock from the factory, the new one has 11Gbps memory now
The old extreme one had a considerable bump in clocks all around, but the new one bumped the memory even further to 11Gbps as well
With Vsync on, you can still get the occasional stuttering once in a while, its just a nature of the beast, I'm not sure how you can differentiate between 250 and 245 fps though, its just humanly impossible.
From my own streaming experience, doing it on a non-HT quad core is a very painful one, so for you @Szentii , either a capture card, or an i7 could give you the results you would want, whichever is more affordable to you.