It is difficult to tell from your attachment exactly what the max temp that was reached was. The graph is just not detailed enough but it looks like it may have been 65-70c and I would assume that is a CPU socket temp rather than a core temp. Please use the free porgram: "HWMonitor" to monitor the temp while you run the Prime95 blend test for 20 minutes. If you cannot complete the test, please report the highest core temp you observed before the crash.
Also, please add a pic of the CPU-z tab "SPD" to that cluster in post #3 so we can see what the memory manufacturer's recommendations are for voltages and timings at various frequencies.