6. For the most part, every variation of the 670 (doesn’t seem to matter who the mfg is) seem to have between 20% and 30% RMAs. In addition, all of the “Top” versions were recently discontinued. I’m really sold on the 670’s specs and features, and there are some pretty good deals right now, but in your opinion, should I wait to see if the problems get fixed or play the odds and get the cards now (evga’s support seems to be very highly rated)?
1. Get a dual channel kit then. There isn't really much difference.
2. No, stick with 1600MHz CL9. Intel CPU architectures don't get much benefit from high frequency unlike AMD systems. Don't ask me why, I don't really know.
3. Honestly, 8gb would be more than enough for gaming and light video rendering. If the video thing is a bit of a hobby or work though, get 16gb to be sure.
4. RAM works on pretty much any system, the QVL are just the ones they tested it on. It doesn't necessarily mean it won't work. I suggest the ASRock z77 Extreme6 or ASUS P8Z77-V PRO or whatever Gigabyte GA-Z77X-UD5H for your budget.
5. I don't personally like and suggest EVGA because of their reference cooling. It doesn't matter to me if it blows air at the back if the air itself isn't even powerful. Highly suggest getting the Gigabyte Windforce x3 or x2.
6. Didn't know about 670 RMA rates, but yeah the ASUS Top versions were discontinued, idk why either. The 670 though is pretty much the best nVidia card you can get and the only nVidia I would suggest since 660 Ti is crippled by it's bus rate and the 680 is just ~$100 more expensive but only a 5% increase in performance from the 670. This is why if you look over other threads in this forum, you'll see mostly AMD Radeon cards are being suggested. The 7970 outperforms the 670 in most things at the same price point so I would normally suggest that, but your 3D gaming asks for a nVidia since they're better at that.