AMD or NVIDIA for overclocking?

Ditto.
Typically Nvidia get better overclocking results simply due to the better thermals their cards have, allowing for higher voltage application and therefore higher overclocks.
AMD's DX12 support is much better though, and they have some great value cards, so really it shouldn't be considered when buying.
 


Low power cards end up with weak, cheap coolers, though, typically. Compare the MSI 390 to the 970, for example.
 
Yeah, hence why I mentioned coolers being a large part of it. :)
I like to think more along the lines of the 390x vs the 970, as they retail for around the same, but the R9 390x performs better at stock speeds, and beats out the 970 in a lot of benchmarks.
Both have decent coolers, but the 390x beats out the 970 at stock speeds, and overclocked comparison.
Even then most of the comparison is to do with voltage delivery and power phases. ;)
 
Depends on what you're looking for. The cheapest card to reach fps goals? The absolute best performance ignoring price? The card with the most headroom regardless of performance? There's no one answer, at each tier it's going to be a different card and probably a different manufacturer.
 
It all depends on what cards you look at. For example, the Fury X has almost no overclocking head room, while its competing card, the 980ti can be OC'ed a ton. On the other hand, if you look at the HD 7970, it had a ton of OC head room, while the competing GTX 680 had a bit less OC ability.

You have to look at specific cards that you are comparing to make a claim.
 

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