I am currently running a FX-8350 with a GTX960 2GB version and I can tell you that that 2GB VRAM on the GPU already tends to bottleneck me on titles like GTAV. It seems that in 2016 titles, 2gigs are the absolute minimum. If you want a mid-range card, I suggest you shoot for a GTX 950 2GB for a 150$ range or the new XFX RX 480 / GTX 1060 for the ~200$ range. Otherwise pairing up a 6400 i5 with a (these days) low-end 750 seems like a bit of a waste.
But in the end setting up your own rig is the fun of it. I suggest you see what price-performance level you can grab yourself these days. http://www.videocardbenchmark.net/gpu_value.html (Take all of this with a grain of salt - the list is formulated by running the test via artificial benchmarks and all games will have different results in terms of FPS vs Price.)
And as Dur already pointed out, do NOT skimp out on the PSU. You should not need more than a 500W for an Intel build, but make sure it is certified, preferably a 80W Platinum.
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PSA: If you have been having stutter/FPS lag on Disco where it does not run as smoothly as other games, please look at the fix here: https://discoverygc.com/forums/showthrea...pid2306502
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