>Prime95 with AVX throttles really, really fast, under a minute, perhaps, but is a very unrealistic load
I suppose blender would thermal throttle the cpu as well. If you run any non-Xeon/non-Laptop Intel chip (greater than 2k series) and care about temperatures - delid the bugger. (Xeons are soldered, laptop chips don't have IHS). Intel uses something that's worse than toothpaste, plus tons of glue between the die and the IHS. If you see temperature deltas under full load more than 9-10C between the cores, the thermal paste between the die and the IHS might have missing spots or have dried out.
In your case removal of the IHS altogether would provide decent results.
You might wish to check the VRMs, they are rated at 125C but if the case is hellishly hot inside, they might not be able to dissipate the heat.
I suppose blender would thermal throttle the cpu as well. If you run any non-Xeon/non-Laptop Intel chip (greater than 2k series) and care about temperatures - delid the bugger. (Xeons are soldered, laptop chips don't have IHS). Intel uses something that's worse than toothpaste, plus tons of glue between the die and the IHS. If you see temperature deltas under full load more than 9-10C between the cores, the thermal paste between the die and the IHS might have missing spots or have dried out. In your case removal of the IHS altogether would provide decent results.
You might wish to check the VRMs, they are rated at 125C but if the case is hellishly hot inside, they might not be able to dissipate the heat.