Check out the link above when you get a chance.
Basically it comes to how hot and noisy you can handle it. The card oc'd to those numbers went up to 42db (fan rpm at 65%) up only 1db from stock and hit 82c max load temp up only 2c from stock.
Now these are from a reference model so your windforce may perform better. Hope this provides a decent guideline if you didn't know this all yet. If you did, then sorry, I hope someone with the same card can then shed more light on the subject. Hope this helps some! Have fun!