I've recently started cracking, and when I tried a rig with 5 or 6 HPCPUs it cracked 3 spaces per brute force, and got heated up pretty quickly.
Now I'm using a different rig with eCPUs and CPUs and it also cracks 3 spaces per brute force and does not heat up at all.
So my questions is, what's the benefit of using HPCPUs? I'm pretty sure I'm missing something here.