AVX Offset Question

[ChrisLoudon]

Hi guys,

 

I'm currently tweaking some OC settings on my 2 main gaming PCs and decided to tinker with the AVX offset that since earlier today has been set at zero.

 

After some tweaking I managed to get my 8086 up to 5.2Ghz on non AVX workloads stable with a -3 offset but having played around with the system for a few hours now, HWINFO reports my clocks at 4.9Ghz MOST OF THE TIME and only goes up to 5.2 when idling.

 

I was under the impression that the offset only kicked in when an AVX workload was detected.

 

Any ideas?

[tikker]

Well then I guess something you are doing when not idling is using AVX instructions causing it to apply your offset.

[Hairless Monkey]

5 minutes ago, ChrisLoudon said:

I was under the impression that the offset only kicked in when an AVX workload was detected.

This is correct, but there are many applications and games that will utilize AVX when it is available to them, and this will affect your clocks when using an AVX offset. Also, keep in mind that software like HWInfo has a reporting interval that is too slow to capture the rapid switching between your AVX offset and regular clock speed.

[Stahlmann]

Even many of today's games use AV instructions. So your CPU behaves as expected.

[ChrisLoudon]

 

Thanks for all the replies.

 

The issue is, I'm not running anything except Windows background tasks and Chrome.

 

*Update* - Running non AVX prime95 (26.6) immediately ramps the CPU up to 5.2Ghz.

 

Its almost as if the offset overrides the manual all-core multiplier set allowing it to slightly downclock when idling as well as AVX workloads

[tikker]

31 minutes ago, ChrisLoudon said:

 

The issue is, I'm not running anything except Windows background tasks and Chrome.

Chrome and, perhaps some fo the Windows background tasks as well, use AVX, e.g. a quick search in the Chromium source code reveals lots of refereces to AVX: https://github.com/chromium/chromium/search?q=AVX.

[ChrisLoudon]

7 minutes ago, tikker said:

Chrome and, perhaps some fo the Windows background tasks as well, use AVX, e.g. a quick search in the Chromium source code reveals lots of refereces to AVX: https://github.com/chromium/chromium/search?q=AVX.

Possibly, but why would it ramp up to the full 5.2Ghz when I give it some Prime work to do. The background tasks and Chrome are still running.

[tikker]

4 minutes ago, ChrisLoudon said:

Possibly, but why would it ramp up to the full 5.2Ghz when I give it some Prime work to do. The background tasks and Chrome are still running.

My guess would be Prime95 is the main and higher priority load taking up 99% of the CPU's time and it's ignoring Chrome.

[ChrisLoudon]

Just now, tikker said:

My guess would be Prime95 is the main and higher priority load taking up 99% of the CPU's time and it's ignoring Chrome.

That's what I thought as well.

 

I'll take a closer look later.

 

In the meantime I've got a DDC pump that's just failed on my main gaming rig so thats the rest of my day sorted! Yay.

 

Thanks for the help