I seriously doubt it, a majority of games are a lot more dependent on your GPU than your CPU.
Hyperthreading only benefits workloads where the threads are very similar due to how it's implemented (It's not proper threading), so things like 3D rendering or video encoding will benefit, while a game (Where one thread might be physics and another sound, etc.) would probably be negatively affected.
You can see it in benchmarks, CPUs with hyperthreading are often slower at single threaded tasks than CPUs without it.
Edit: The i7 2600(K) runs 100Mhz faster than the i5 2500(K), yet has worse performance in common workloads, etc.
-snip-
i7 => Any kind of encoding (Streaming, Movie editing) / rendering (3d models etc)
You can always buy one if you have the cash and turn off hyperthreading in the BIOS. If you plan on doing something/playing games which uses HT, turn it on again.
An i7 is about the same as an i5 but with HT.
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