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Currently I don't have much need for virtualization.

Anecdotally, my friend's old computer had BSODs a few times a week, but after disabling VT-x the BSODs didn't appear anymore.

In general, will disabling VT-x will make the computer run faster/more stably?

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If you don't need it, disabling it via the BIOS is fine.

In terms of stability, having it enabled or disabled shouldn't hinder/benefit the stability/performance of a PC. If you're not using software that is making use of virtualization, it should not affect performance.

Are you sure your friend didn't make other changes in the BIOS in order to try and fix his problems? Maybe he had an unstable CPU or RAM overclock.

I've had virtualization both enabled and disabled and when I've run benchmarks and stress testing applications, I've never seen a performance drop or a stability issue.

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I guess that the results change from system to system. Searching in the web, someone claims to have experienced issues, solved by upgrading the BIOS. If two BIOS versions change the results, a different system should change even more. I have BSOD or freezing issues on HP Folio 9480m, which persist after BIOS upgrade to 1.32. I still have to test what happens disabling VT-x. –  Halberdier 11 hours ago

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