Do you have two monitors?
If you put windows performance monitor (one of the tabs in task manager) on the second monitor, you'll soon see if your overclock is the cause.
If your CPU is bottlenecking it, you'll see it pin at 100% while in game. Otherwise, something else is going on.
PERSONALLY I overclock like a madman, but thats my own system, and its an x99 LGS2011-3 system, so it can.
When its SOMEONE ELSES computer, my first step is usually to suggest "Over Optimising" their stock parts, then go from there.
First of all, lock all your voltages to their stock. It may take some googling, but you'll find each settings defaults. If your board can't do defaults, lock it at the smallest bump up you can do.
We wont be needing ANY extra voltage for this bit, but sometimes 'stock' becomes 'auto' and thats not OK.
Find your PCI-E link speed and whack it to somewhere between 101mhz and 105mhz. Dont try and go higher. I personally stop at 102mhz.
Open up your baseclock and set it 1mhz highter (this will be a decent 'bump' thanks to the decent multipliers). (+33mhz, +37mhz @ turbo, maybe risk +2mhz BCLK; but very soon we'll need to unlink your ram speed.)
Leave your ram stock, it'll already have a slight bump from the bclk (33mhz...)
Load into windows, open your drivers and max out the stock GPU overclock sliders. Its rare to find a GPU that wont take the full 'GPU driver overclock' just fine; buy maybe try with 50% of the sliders to start :P.
Then we go from there :)
Once thats stable and we do some in game testing, we can push part by part.
Edited by Master_Scythe, 20 August 2016 - 11:39 PM.