I had to tweak my voltages when I originally got this motherboard due to stability issues. Since I found stable values I am not prepared to start messing with them again in case the lockups start again.

If you look up this thread:

http://www.tomshardware.co.uk/forum/...-790i-freezes#.

You'll see my voltages.

At the same time, if there really was a voltage issue would I not be experiencing problems in other areas of my system?

I fail to understand how your PC can be perfectly stable 24/7 doing everything else bar FFXIV and somehow my PC is the problem.