If temps are an issue make sure have the block seated properly. I had the same issue with my G10 and MSI gaming GTX 770 when I reseated it (turns out I accidentally stripped one of the screws so I improv'd a ziptie for that missing screw). My temps for it are currently 25-51 celcius while idle/gaming.
While the temps are nice, I always worry about the vrms. If I had gotten a refference 770 I would have just gone with a custom loop.
But for what I payed for, it's alright.