I just started GPU mining with a Radeon R7850 (Ultra OC Edition). I'm using Bitminter for now since I'm a noob before I move on to dabble in scrypt mining and have a few questions.

1) First and most importantly I plan on mining 24/7 so I need to know what is a "safe" temperature to do this at.

I've maxxed out the GPU clock setting and am getting slightly above 300 Mh/s at 74C.

2) As I understand it the Memory Clock setting is not crucial for SHA-256 but is important for scrypt mining. I tried to max out the Memory clock setting while the GPU was at maximum but it crashed. Is this just a setting I should tweak once I am scrypt mining?

3) Let me know if there is something glaringly wrong I am doing or can improve upon:

http://i.imgur.com/53gzKk2.png



 Thanks. Feels good to start mining.