Is there some specific test that is more definitive?
Write a script to do 10GB 7z compression and decompression concurrently, for a few hours. Easy to do.
Something like:
Compression script (create in notepad)
7z "compress" "source file" "destination file"
del "destination file"
7z "compress" "source file" "destination file"
del "destination file"
... and so on as many times as you want and rename this to cmptest.cmd
Decompression script
7z "decompress" "source file" "destination file"
del "destination file"
7z "decompress" "source file" "destination file"
del "destination file"
... and so on as many times as you want and rename this to dcmptest.cmd
Keep these in different folders.
Then run both cmptest.cmd and dcmptest.cmd and wait for them to finish. You can keep Task Manager core utilization graph and HWinfo open at the same time to see how the temps, voltages etc. are going during the whole process.
You will need to check 7z command line parameters to see what options to use. Recommend you try the most strenuous and slowest compression method. Probably LZMA2?