I have an athlon 2500+ on a shuttle xpc sn45g nforce2 ultra 400 mobo. i oced the proc to 3200+(11x200mhz). I also have a radeon 9600 pro. When i play Tron 2.0( or any cpu intensive programs) for about 30mins the game starts to stutter. so i exit the game and accidentally clicked on the 3dmark2003 shortcut and i saw my 3200+ clocked at 1896mhz! The CPU does get pretty hot about 53c Load. i tried it over and over and saw that the cpu underclocks itself making the game stutter. Is it a heat related issue? i used the thermal compound the shuttle xpc provided me. should i have used arctic silver? oh and wat voltage does the 2500+ barton use. my mobo auto-detects 1.69v. its pretty hot in my room too about 75c. thanx in advanced.