For a stress i use "yes > /dev/null &" for each thread on macs.
But that corona site says something about buying....? But the PC i am working on has a good CPU cooler
DL the Corona Benchmark it's free and will push the CPU hard on a rendering test. You'll see how good your cooler is then

My numbers are from an ASUS ROG GL703GS notebook re-rolled as a portable workstation (8750H, 32GB @2666, GTX 1070, NVMe SSD & SSHD, soon to be replaced with a 2TB Samsung Evo)
Thermal limit of the notebooks chassis; Intel PL2 90W, PL1 65W, no thermal throttling
The notebook offers near desktop performance that you can throw in a bag and travel with. Currently up country now in Malaysia on my primary engineering project. The GL703GS came with 3 years OEM warranty as ASUS believes in their product, as opposed to Apple who only ever offers the minimum legal requirement on so called premium products
TBH I've a better support policy with a $650 2in1 from Acer than I'd have with Apple's MBP and my spec would cost over $4,250...
Q-6