So I'm not an expert on HT and how it impacts performance, but I have learned on the internets that most games do not make use of anything more than a 3770k.
And a 3770k has 4 cores that are hyperthreaded, making 8 threads.
Now, most agree then, that the 3930k, with its 6 hyperthreaded cores, is overkill, as the games do not utilize those extra two cores.
However, what about a 3930k with hyperthreading disabled? Now, you have only 6 threads. 6 very fast threads. Would this perform even better than the 3770k, since, as I seem to have gathered, most modern games can utilize up to 8 threads?
Sorry if this is a dumb question..
Unless you are doing gaming at 1440p or 1600p, there is 100% no need for a 3930k. Only get that CPU if you are doing very high res professional graphics and video or if you are rich and want a gaming build that'll last 5-6 without an upgrade.
Most modern games don't utilize 8 threads. Most modern games seem to utilize somewhere between 2 and 4 threads; that's why the Core i3 (2 cores w/ Hyper threading) kicks the crap out of its dual-core cousins that lack HT. That's why the i5 (4 cores, no HT) has a significant advantage over the i3.
And that's why the i7 (whether of the 4 or 6-core variety) has no noticeable advantage over the i5 in most current gaming benchmarks.
But I don't expect that to last forever. The 6-core i7 is definitely overkill, but that's as much a commentary on the cost of the LGA 2011 platform as it is a commentary on the chip's relative performance. The 4-core i7 is generally regarded as overkill among gaming enthusiasts (who prefer the i5 3570k), but depending on your budget, the 4-core i7 may be worthwhile even so, because it's really not that much more expensive than the i5 in the grand scheme of things.