user bench mark showed me worse stats compared to yours, however i have the same graphics card (by gigabite, i think)
but i never experienced any lags even though i work with large canvases like 10k pixels+ (not always, but mainly), I used to have lags with older graphics card. ( and i game with max settings with no problem)
But , i have windows 7
And I avoid updating photoshop too often only if i see any drastic changed in the description.
https://www.userbenchmark.com/UserRun/20537663 - these are mine, if it will help you with anything, i don't rly know.
I'm not overclocking my PC tho, i actually have it switched off, coz I don't see any need in it, personally. I think if you overclock your pc it can cause CPU spikes, so you'd need to either switch it off or supply your CPU with additional Voltage to maintain system stability.