I have a Vostro 3700 that would freeze. I suspected it was overheating. I planned to replace the i7-720qm in it with a i7-940X and at that time redo the thermal paste. 1. Vostro 3700 runs i7-940xm great. No issues. 2. Replaced the thermal paste with Dell's Loctite Powerstrate Xtreme on CPU. Original CPU paste a crummy job. Runs much cooler after redoing paste. (Also blew out motor and air vent) If you're having any reboot or freeze issues, probably overheating - However - 3. I'm no tech expert but not a tech weenie either. Redoing paste (and replacing CPU in Vostro 3700 is delicate job - not for amateurs. I was afraid I had ruined it during reassembly. Do your homework with Dell' Service Manual before you take apart and attempt this!