Enable AVX after CPU upgrade

A forum for discussing FAH-related hardware choices and info on actual products (not speculation).

Moderator: Site Moderators

Forum rules
Please read the forum rules before posting.
Post Reply
Nicpaillard
Posts: 4
Joined: Sat Sep 12, 2020 8:30 pm

Enable AVX after CPU upgrade

Post by 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
Posts: 2061
Joined: Sat Dec 01, 2012 3:43 pm
Hardware configuration: Folding@Home Client 7.6.13 (1 GPU slots)
Windows 7 64bit
Intel Core i5 2500k@4Ghz
Nvidia gtx 1080ti driver 441

Re: Enable AVX after CPU upgrade

Post by 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.
Post Reply