@N19 - ahh I see - would you not have a punt and see what they can both do
I'm curious but inside my H440 chassis the two cards already run at 84 degrees with a max sustained boost of 1290Mhz.
Happy enough with their performance, and I'd likely get a 3rd card over overclocking. Reason I went for the superclocked ones.
Might be stable in benchmarks and gaming at an OC but if it's sitting at full pelt in Adobe rendering for a few hours I want stability.