Ufff sorry to hear about the accident M1notaur...hope you are recovering OK
About the OC you should have a look at the page Menthol linked...there is a guide there
https://rog.asus.com/forum/showthread.php?38018-Ivy-Bridge-E-Easy-Overclocking-Guide-%96-The-Listy-W... but also loads more info
The thing is each CPU is different in what it will run at that there is no real way for us to give you a recipe if you know what I mean...you kind of have to do this yourself bit by bit
One thing....when you are getting to 4 GPUs there is really no point in overclocking them...the throughput from all 4 is so much that the CPU becomes a bottleneck most times...even highly overclocked...it's likely all the extra voltage heat and noise would net you virtually no performance increase
So, I'd suggest leave the cards alone and concentrate on working out what your CPU can do OCd