Bad. You don't want temps over 65-70°C on an AMD chip, max. Under full stress from Prime95 or another stress utility. Pretty sure the Heaven benchmark does not provide full stress except to the GPU card.
I'd bet you either have a lack of airflow THROUGH the case, due to fan orientation or lack of fans, or have a bad mount job. It's very easy to go too little or too much on the thermal paste or fail to fully get one of the corners of the mounting system down. Take a read here and try again. Also, don't use HWmonitor. Use either AMD overclock and look at the CPU tab that shows thermal margin (Distance remaining to TJmax) or HWinfo (Run "sensors only"). Even Core Temp is good. Core Temp also offers a setting in it's options to show...