Dunno, I have my bio a Haswell build from 2013, i've never OC, i feel i need more gunt now =(
i5 4670k 3.4ghz
Z87oc Gigabyte
Samsung EVO SSD Win 10 64
MSI 680 lightning 2Gb
2x4 gb RAM DDR3 1333mhz and 2 slots available on mobo
Antec 750w
Very good colling and case, my CPU seems to have a lot of headroom, never much above room temp and my GPU's fans never appear above 40%, (im just scared of OC becuase i havent got a clue what i'm doing)
I feel ive never really tested my PC, but playing stuff like BF4 now on highish settings gives me 40 FPS, and stuff just seem slower, but it is almost 4 yrs old now..
Would not know where to improve, those 2 RAM slots? if anyone can offer where i can improve best i would appreciate it.