Cooling performance of a NH-D15 is actually better than H100i GTX, but only by the tiniest margin. I wasn't saying that it's the specific model you need, only that it's the sort of thing you need - your cooler is certainly good enough. Yes, you can always replace fans on an AIO (unless they've built it in a way which prevents that, as some do) ... it's the pump and rad you can't replace without cutting the loop and basically repurposing it into components for a DIY liquid-cooling system.
Hmm, your mobo doesn't have a Q-Code display, only Q-LEDs. Sorry, that's entirely my error. Q-Codes are basically standard issue on all ROG boards these days, I'd forgotten that only a few years ago they weren't.
The FX-8370 you used before was a 125W part. Still a big powersucker but also still within the realm of "normal" CPUs. The FX-9590 you use now is 220W and that's huge enough to make a lot of difference across the board. 220W even exceeds AMD's own electrical specifications for their AM3+ socket. The FX-9590 was always notorious and difficult to overclock, you'll notice that all the epic AMD-based world record overclocks were actually made with "slower" FX-83xx parts. For some people "it just works" the moment you drop it into socket, but for most it sadly does not.
Yes, stripping nonessential electrical devices and reconfiguring (simplifying) RAM have very little impact. But maybe enough to pull a cranky system below the instability threshold, at worst some experimenting only wastes time.
There are some excellent overclocking guides for your mobo and your CPU(s) on these forums, along with many more at overclockers.net and other sites. They'll specify board-specific BIOS settings in detail. I don't have that board anymore so I can only really offer general advice and hardware solutions, lol.
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