[quote='not5150',index.php?page=Thread&postID=15857 1#post158571]WoW isn't multithreaded, so there's little benefit to be gained from hyperthreading.[/quote]
I don't think we can draw that conclusion because (a) WoW in fact has multiple threads (26 according to Task Manager), and although the degree of concurrency may be small it's not zero. And (b) we're talking about running multiple applications at the same time. WoW isn't single-threaded but to be very conservative, let's say that it is. If we run (say) eight instances of a single-threaded app on a four-physical-core CPU, the result is similar to running four instances of an app that has two perfectly independent threads.

I found some more benchmarks showing hyperthreading on vs. off. Unfortunately these benchmarks are all single instances of apps instead of multitasking, but I think they show the importance of testing exactly what we're curious about.

[url='http://www.tomshardware.com/reviews/Intel-Core-i7-Nehalem,2057-12.html']i7 and Hyperthreading on Tom's Hardware[/url]