Here is a scene from real production (still in progress). It contains many hi-poly objects, ~50 Vray Proxies, ~200 textures (more than 2GB overall) as well as a lot of tree groups, populated with VrayScatter.
HT OFF: 1h 22min 25s
HT ON: 1h 5min 3,7s
Hyper-threading gain: +26%
FumeFX 2.1a scene. Default simulation mode and rendered with Scanline.
Theoretically, this beast is a little different. Some FumeFX simulation parts aren’t multithreaded, so those operations are done on a single thread, BUT overall dividing isn’t 1/8, but 1/4, so even when Hyper-threading is enabled calculation isn’t left for one half-divided core. And practically, we see that HT helps even in that situation.
Hyper-threading is in any ways good Intel Technology, I’m recommending enable it whatever you do.