How can I check in-game APU temperatures?

We all know the issues programs like HwMonitor, Coretemp and speccy can have with an AMD APU/CPU during a heavy load or not. With an Intel CPU they work fine. HwMonitor and Coretemp save min and max temps making a check of the highest in game temp. easy. Without a second monitor how can I see a real time temperature/thermal margin that will be accurate?