i7-7700 don't run with Turbo Frequency

SuperMario · 22 Feb 2020 at 09:19

Hello together,

sorry for my bad english and if I maybe in the wrong forum. But I hope somebody of you can help me.

I have an Asus B250-Pro Motherboard running with an Intel i7-7700 processor and Windows 10 as OS. The processor should running in Turbo Mode with 4,2 GHz.
But everything I did, the highest freqency is only 4,05~4,07GHz. I have tried to change the energy plan to maximum, disabled the energy options in BIOS and disabled the intelppm driver. Everytime the same result.

Have anybody an idea how can I investigate the issue?

Thanks for your help
Mario

DoneADougalOnSofa · 22 Feb 2020 at 09:34

4.2GHz is the maximum boost speed on a single core. All-cores at once will not hit that speed. Same with most chips to be fair- my Ryzen 2700X is rated at 4.35GHz boost for single-core only. Max out all the cores, and you're looking closer to 4GHz not 4.3...

SuperMario · 22 Feb 2020 at 09:42

Thank you for your fast answer. But should I don't see this in the resource monitor? There is no once core who is running with the highest frequency.

LuckyBenski · 22 Feb 2020 at 09:43

4.2GHz is the maximum single core boost and 4.0GHz is the maximum all-core boost.

If all cores are being used, they are all limited to 4.0.

Try running a load which uses only one thread (for example a single Prime95 worker). If you use logging like HWinfo, it will show that individual cores can go to 4.2.

SuperMario · 22 Feb 2020 at 09:55

Okay, I hope I understand you right. That means if I switch off HT one single core can run with 4,2GHz? My main issue is the game Assetto Corsa what is not programmed as multi-thread game (only read in Assetto forum). Does it make sense to change my processor setup in the BIOS to run as single CPU ?

LuckyBenski · 22 Feb 2020 at 10:07

SuperMario said:
Okay, I hope I understand you right. That means if I switch off HT one single core can run with 4,2GHz? My main issue is the game Assetto Corsa what is not programmed as multi-thread game (only read in Assetto forum). Does it make sense to change my processor setup in the BIOS to run as single CPU ?

No - hyperthreading allows one core to have 2 threads. So you would have 4 cores and 8 threads. If you disable entire cores you will lose performance massively!

It just comes down to the task you're running. If Assetto Corsa is not very multithreaded, it should naturally allow higher boost. Make sure you don't have other tasks running in the background that could demand CPU resources.

DoneADougalOnSofa · 22 Feb 2020 at 10:20

No, don't disable anything.

Your chip is working just fine!
Assetto Corsa does use multiple cores/threads since recent updates, it's a pretty demanding game.

SuperMario · 22 Feb 2020 at 10:37

LuckyBenski said:
Try running a load which uses only one thread (for example a single Prime95 worker). If you use logging like HWinfo, it will show that individual cores can go to 4.2.

You mean these both programs ?

https://www.hwinfo.com/
https://www.mersenne.org/

This topic sounds exactly how my question. In that case the motherboard was the reason for the degradation.

https://www.techpowerup.com/forums/threads/i7-7700-non-k-is-not-hitting-4-2ghz.233283/

Thanks @all for your help!

EsaT · 22 Feb 2020 at 16:00

That motherboard is pretty cheap/low end and its VRM could be incapable to feeding that CPU under full all core load.
"Naked image" here shows B250-Plus, which has just single low side FET making that VRM cut down even compared to those capable to properly feeding only 65W TDP CPU.
https://www.techpowerup.com/229169/asus-prime-b250-pro-motherboard-detailed

Would expect BIOS of such board to have some power draw limits to prevent that VRM from getting stressed too much causing failure.
Which is something you'll want to avoid.
VRM burning into short can send direct 12V into CPU killing it as fast as bullet.