[insanebits]

It might even be 20 core processor, because htop actually shows threads and most processors nowadays are 2 threads per core.

For example my R710 shows 16 threads while it's only 2x4 real cores.

[Rafert]

It's not as simple as 2 threads per core, the amount of performance gains of hyper-threading are dependent on the application you're running afaik.

[phamilton]

I think the point was more that 40 cores was a ceiling for computational hardware, and it's very possible the actual hardware was 20 cores with hyper threading, which would result in much lower perf than a true 40 core system.