TjMAX is suppose to be set at 100C. It is the temperature the CPU will shutdown / throddle down to protect from over heating. I miss read your original post and thought you were listing the core temps. However, temps of 80-88 degrees Celsuis is rather hot still (specially if an idle temp). You should be looking at mid 30's for idle and 60's (Max 70's) after two hours of Prime95 with acceptable cooling.