Hi all, first post - woot! I have been reading through a couple threads and wow, there is some serious knowledge on here, it makes my head hurt! Also, prepare thyself for an essay.... Here goes.... Anyhow this pc i have built will be my third self built PC and so far it has been my proudest, but I am having quite a few issues with it at the moment... My aim for this PC was to build a watercooled, 4K gaming beast with everything RGB because RGB makes games run better (sarcasm) - along with the power to do some recording and video editing for when i get back into recording YouTube videos. I am also wanting to delve deeper into the world of overclocking hence all the watercooling. I have dealt with a major issue so far of constant crashes during games (PUBG a lot), to which I upgraded from a Corsair AX760 PSU to the 850W below, and then everything seemed to be dandy for a while, with except PUBG still crashing, and slowly crashing more frequently. (It's my main game played generally on 4K and Ultra - constantly getting 50-60FPS). No BSOD, just straight freeze for a second or else a straight reset. I fiddled around (re-seated GPU, changed RAM slots and ran two seperate PCIe power cables to the 1080ti rather than the single PSU slot - dual PCIe connector style) and it now seems to be pretty good and I rarely get crashing. Only thing is that I wanted a bit of smoother gameplay in PUBG so reduced my res to 2K and left everything on ultra, only to be chatting to my game mate who has MUCH older internals (3rd gen intel build but with a 1080ti) and hes getting better FPS than myself in my games. I dont want to sound like a - "oh i spent all the money therefore it will run fast" - kind of guy, but shit, this thing has cost me thousands, and I could have basically put a 1080ti in my previous build and would have gotten the same results, only to pocket the other few grand. Specs of my PC are as follows: Acer 28" 4K G-Sync monitor Intel i7 8700k Gigabyte Z370 Aorus Gaming 7 Mobo (F7 Firmware i believe?) G.Skill 2x8GB 4266MHz GTZR RGB DDR4 Gigabyte GTX 1080 Ti Aorus Xtreme Edition Corsair HX850i 850W 80Plus Platinum PSU Full EKWB Kit - CPU + GPU Coolers with P-Series 360mm Front / S-Series 240mm Top Radiators ALL THE CORSAIR HD120 RGB FANS Corsair Crystal 570X ATX Case One other surprise i am getting is that every time I enable XMP in BIOS, my computer pops an error on startup that there was a BIOS startup error and I can only get the PC to run if I run off defaults. My CPU is OC between 4.5GHz-4.8GHz through Intel Extreme Tuning Utility and my GPU through MSI Afterburner (+400MHz clock speed, 150% power limit). I haven't touched RAM timings or changed my CPU/GPU voltages because I simply don't understand what I need to increase to get this better performance, and I dont want to fry my shit because I cant afford to replace any mistakes at this point in time. I would love for any insight in how I can go about getting the most out of my internals, getting XMP working again, and a basic guide as to which voltages I could touch and which ones I should leave out, and whether to simply use software to guide the OC or if i should use the BIOS to achieve this. If you read down to here, I congratulate you, and I seriously thank anybody who can give me any information as to how to get this machine to run that bit better. Cheers everyone and miles of smiles TL;DR - guy with too much money buys top end components, has stability issues, sorts some, but needs to know what is the best way to OC the components so he can play PUBG like Shroud.