overclocking the 1080 incorrectly?

[rajnegi266]

i recently put a custom water loop in my build and i want to overclock the cpu and gpu
i am using afterburner and unigine heaven and 3d mark time spy
when i set my core clock to 150 and memory to 400 i get the highest score in the benchmarks out of all my tests the temp stays around 55-60
the problem is that when i increase my memory to 550 or 600 the ungine benchmark crashes
even though my temp stays at 55
is it normal or am i doing it wrong
also i have my core voltage to 120% will it make a difference or i can i have it at 100% or 110%?

rig
8700k
gtx 1080 strix
aorus ultra gaming
2 360 radiators
6 fans

 

[JalYt_Justin]

Seems like you hit the limit, not all cards overclock the same and will eventually run into its own wall when overclocking. Not doing anything wrong, you just hit hardware limit.