It seems it would not though even with other i7s:
Benchmarks: i7 Overclock/HT Performance Scaling
http://www.overclock.net/intel-cpus/904301-benchmarks-i7-overclock-ht-performance-scaling.html
Yeah, I meant for the encoding part - should have trimmed my quote to make it clear. I was leaning towards the 2600K, but the more I think about it the more I lean back to the 2500K instead. How does HT affect overclocking/heat? I remember it being an issue when i7 first came out - still a factor now?