SgtScream :
Run some benchmarks. See if you have higher fps with HT disabled.
I've done this extensively over the last few years and read many reviews already using my i7-3770K. It's a non-issue with perhaps 5% absolute worst-case losses but over 20% best-case gains.
Most stuff it's within 2%.
(though HT can produce LESS stutters nowadays aka "0.1% lows" in some games even when average FPS is the same)
Also, depending on what you're doing the CPU will usually be the gaming bottleneck anyway so as I said the HT may make no difference at all.
*It's a big hassle to go into the BIOS, come back to the game then do that for every single game. Then what? Disable it for games you gain a bit, and enables for the reverse?
It's good advice in theory to test it yourself but it's actually quite a hassle.