Different CPU Multiplier.

[Ahhlong]

Hi I have a Asus X99 A-II motherboard and a I7 6850K

 

Recently I have been trying to overclock my CPU and have no idea why when I change my voltage and all that stuff my CPU will still show that my CPU multiplier is set to 40 when I set it at 42 and have ran prime95 and still at 40.

 

And the weirdest part is when I set my CPU multiplier to SYNC ALL CORES option, the speccy application will show that only my core 0 is running at x40 while the rest is all at x38. Why is that so? Shouldnt it all be at x40?

 

Please guide me thanks. 

[WereCat]

There is different multiplier for AVX workloads.

If you run Prime95 with AVX then your CPU will run at the max AVX speeds which typicaly runs on lower speeds because its very demanding and its also the cause of high instability while overclocking.

 

If you want it to run at x40 or 42 at all times in all workloads then you also need to up the AVX ratio in BIOS to the same value as Core.

[Jurrunio]

Because AVX offset? basically dropping multiplier by the number of offset during AVX workload as heat output shoot up a lot on Intel CPUs.

[Ahhlong]

2 minutes ago, WereCat said:

There is different multiplier for AVX workloads.

If you run Prime95 with AVX then your CPU will run at the max AVX speeds which typicaly runs on lower speeds because its very demanding and its also the cause of high instability while overclocking.

 

If you want it to run at x40 or 42 at all times in all workloads then you also need to up the AVX ratio in BIOS to the same value as Core.

what is the AVX ratio setting in bios called?

 

[Wolly9102]

4 minutes ago, Ahhlong said:

Hi I have a Asus X99 A-II motherboard and a I7 6850K

 

Recently I have been trying to overclock my CPU and have no idea why when I change my voltage and all that stuff my CPU will still show that my CPU multiplier is set to 40 when I set it at 42 and have ran prime95 and still at 40.

 

And the weirdest part is when I set my CPU multiplier to SYNC ALL CORES option, the speccy application will show that only my core 0 is running at x40 while the rest is all at x38. Why is that so? Shouldnt it all be at x40?

 

Please guide me thanks. 

it's normal

[Ahhlong]

 

1 minute ago, Jurrunio said:

Because AVX offset? basically dropping multiplier by the number of offset during AVX workload as heat output shoot up a lot on Intel CPUs.

So should I even alter the AVX option or shld i just leave it alone?

[WereCat]

1 minute ago, Ahhlong said:

what is the AVX ratio setting in bios called?

 

Each BIOS from different OEMs may call it differently but there is an exampe from ASUS

 

[Ahhlong]

Just now, WereCat said:

Each BIOS from different OEMs may call it differently but there is an exampe from ASUS

 

ohh so if i want the multiplier to be the same what should i set the value at?
 

[WereCat]

1 minute ago, Ahhlong said:

 

So should I even alter the AVX option or shld i just leave it alone?

Its up to you. AVX will make the CPU quite a bit more toasty WHEN it will be used, like in Prime95 for example, so be ready for that. In games, it doesent really matter that much.

[Ahhlong]

1 minute ago, WereCat said:

Its up to you. AVX will make the CPU quite a bit more toasty WHEN it will be used, like in Prime95 for example, so be ready for that. In games, it doesent really matter that much.

so does the multiplier values actually make a difference in games?

[WereCat]

1 minute ago, Ahhlong said:

ohh so if i want the multiplier to be the same what should i set the value at?
 

No idea. I dont have a motherboard and CPU where I could tinker with this.

 

But if the offset is based on a default AVX multiplier which seems to be x38 and you want for example 40, then you may need to put in +2, if you want x36 then -2.

 

If the offset is based on a CPU multiplier and you want it to stay the same, then let it be on a 0. If it has stability issues, then start decreasing it by 1, 2, etc... 

 

IDK which one of these options are the correct ones since I cant try. Just experiment.

[WereCat]

1 minute ago, Ahhlong said:

so does the multiplier values actually make a difference in games?

That depends on each specific game. But usaly you wont see a difference. It does make a difference in workloads, video encoding, 3D rendering in Blender for example, etc...

[Jurrunio]

11 minutes ago, Ahhlong said:

 

So should I even alter the AVX option or shld i just leave it alone?

using AVX offset can help you overclock the CPU further for non-AVX situations, so that could definitely help. If you're not interested in tinkering though, leave it alone

 

10 minutes ago, Ahhlong said:

ohh so if i want the multiplier to be the same what should i set the value at?

0.

 

6 minutes ago, WereCat said:

 

But if the offset is based on a default AVX multiplier which seems to be x38 and you want for example 40, then you may need to put in +2, if you want x36 then -2.

I think it's the opposite. Putting a positive number gives multiplier decrease. Also can't go below 0 on boards I've used.

[Ahhlong]

35 minutes ago, Jurrunio said:

using AVX offset can help you overclock the CPU further for non-AVX situations, so that could definitely help. If you're not interested in tinkering though, leave it alone

 

0.

 

I think it's the opposite. Putting a positive number gives multiplier decrease. Also can't go below 0 on boards I've used.

no idea why I cannot change the value to 0 its only 1 or AUTO

[Jurrunio]

2 minutes ago, Ahhlong said:

no idea why I cannot change the value to 0 its only 1 or AUTO

then Auto means 0.

[Ahhlong]

1 minute ago, Jurrunio said:

then Auto means 0.

but thing is its set to auto when the multiplier values are different like i mentioned

[Jurrunio]

5 minutes ago, Ahhlong said:

but thing is its set to auto when the multiplier values are different like i mentioned

update the bios? Otherwise just use 1 and call it a day

[Ahhlong]

so its not that my CPU have any problems right

[Ahhlong]

but why when I change the multiplier to other values like x42 x43 it doesnt show that? It will still show only x40 in CPUZ. The frequency only changes when the bus speed is changed.

[Stormseeker9]

13 minutes ago, Ahhlong said:

so its not that my CPU have any problems right

Have you tried and downloaded something like HWmonitor to see what that reports? Try a stress test like Aida64 and see what happens then