Re: Hyperthreading (sorry, I know it's been discussed)
Could be that the previous owner was running it as a server and the server software ran better with HT disabled. Or was a gamer, or an Overclocker/Benchmarker trying to set world records with apps like 3DMark, Unigine, gaming benchmarks, etc. But more likely the 1st option (where the primarily-used software on the computer runs better with HT completely disabled in the BIOS). These days most modern software supports HT, but can still have problems with it.
Clevo 17" | i7-3630QM | 16GB HyperX | 256GB SSD + 1TB HDD | GTX680m SLI | WIN7-64bit | Cakewalk by BandLab 2018.04 | SONAR X1 Studio (Retired) | Project5 | VS-100