Is hyper-threading bad for srcds?

I’m worried that srcds isn’t given full power of single core (4.0 GHz), is there any evidence that hyper-threading makes srcds underperforming?

Provided that your other “cores” are not stuck in very heavy work loads, HT will not affect the performance of SRCDS, however if you are worried about possibly jitter in performance in the case of random heavy work loads happening, you should disable it.