Enable AVX after CPU upgrade

[Nicpaillard]

When I upgraded my CPU, from a non-AVX to an AVX CPU, my system didn't recognized the new instruction set. In fact, Windows (Win 7 -x64) didn't. So, to enable it without having to reinstall Windows, you have to instruct windows to use it. I found the tweak on Superuser forum:

To enable or disable AVX instructions you can use this commands:

Enable AVX: bcdedit /set xsavedisable 0

Disable AVX: bcdedit /set xsavedisable 1

Open your command prompt and type it, then hit the enter button.

I hope it will be useful to some.
From: https://superuser.com/questions/244213/ ... y-computer

[foldy]

Or the other way round if AVX instructions running FAH make you CPU too hot and you cannot set an AVX offset in BIOS - then just disable in Windows and fallback to slower SSE instructions.