Typical thickness of thermal pads

Hello, new here and have a question.

Is there a thickness of thermal pads on mosfets/chokes that is typical across brands and models? I have an MSI r9 290 twinfrozr gaming and I think it is exhibiting overheating issues, crashing the computer. I managed to take the screenshot below, just before it made my computer hang, while I put some stress on it.

Repeating the stress test made it seem like when the VRM temperature for the R9 290 reached about 68ºC it would crash. I have no idea if it's the VRMs or not behind the problem, but that was the only temperature reading that I thought was abnormal. (ignore GPU1: the RX 580 temps plz)

So I'm planning to repaste and replace thermal pads to see if this helps, but I wonder if anyone knows the thickness of pads for the MSI R9 290 so I can perhaps order them before I take it apart. Also, does anyone think there is another reason for the crashing while under load?