7700K + DRAM overclock (new pc) HELP

Hello

Got a new pc. Looking for help to overclock cpu and dram. Never done this before.
Looking for a 4.8 stable overclock. Have never done this before so I don't know what to do.

Overclocking Ram has proven to improve PUBG fps.

cpu: 7700K 4.2GHz 8MB
gpu: Asus Strix GTX 1080 Ti 11GB GDDR5X
mobo: ASRock Z270 Pro4
psu: Corsair 750W Modular
dram: ADATA 16Gb XPG Z1 Red CL16 (2x8Gb) [These run at 2400MHz . Read they can run at 3000MHz stable. Please help me wit this!]
case: Gladius M35
ssd: ADATA 256GB SATA SSD Ultimate SU800 M.2
OS: Windows 10 64

cpu cooler: Corsair Hydro Series H100i v2

Sorry not much Asrock bios knowledge, but I would tweak from the XMP setting at 1.50V if that memory is based on Hynix then straight timings is what you should go with, 16-16-16-28 or 17-17-17-32 or 15-15-15-30. Just keep going lower on x and stay above 24 on y (x-x-x-y)

A simple app that you can test the settings is AIDA64, run memory bandwidth test note the scores and improve them.

You can go up to 1.55v but try not to go higher, it will cause fail usually.