I installed my new Asus gtx 460 1gb card this week, and I've noticed it heats up to 70c at full load. Is this hot for this card? My old gts 250 would run at about 60c. I thought about overclocking the 460, but I don't want to if I don't have anymore clearance in the temperature department. Can anyone tell me what is a good temp, and a good overclock speed for this card?