what is the
PR rating of your processor ? AMD 2000+ or which AMD processor ?
The speed of your processor is 1155MHz, do you use AMD X2 or single core ?
Make sure you have turned off Asus Q-Fan and all such automatic cooling features. Generally in summer, if temps rise, some mobos, automatically lower processor core clock speed. Your speed 1155MHz seems too slow, comparing with mordern clock speeds.