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18 Posts

02-26-2021

Germany

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  • Message 11 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-05, 19:38 PM

The only benchmark I run was 3DMark Time Spy. The CPU score with the 'limited' speed was around 10000, now it is around 13900. So it helped.

 

I will run your and let you know.

 

I managed by re-flashing the BIOS with the same version. But this was because the CPU speed seemed limited to a lower speed than normal.

 

Try to generate some full CPU load with a tool like prime95 or Aida64 stress test and check your CPU speed in task manager - performance tab. Post it here. If you see something in the range of 4GHz then you might have the same issue I had.

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18 Posts

02-26-2021

Germany

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  • Message 12 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-05, 19:53 PM

15139 with CInebench R23

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14 Posts

03-05-2021

Finland

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  • Message 13 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-05, 22:08 PM

Thank you so much for testing. Now that score looks good! How was your temperatures? Was it manageable?

 

I downloaded AIDA64 Trial and seeing very same Max Turbo Boost Multipliers as you showed on first page.

Tested some benchmarks with AIDA64 and it was indeed around 4 GHz. Seems like I have same issue as you were having.

 

Would you please direct me to the solution how it re-flashing BIOS really works?

I am total PC novice and BIOS says nothing to me.

 

Thank you so much!

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14 Posts

03-05-2021

Finland

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  • Message 14 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-05, 22:48 PM

Here is another screen. CPU Turbo Max is 4300.0 MHz just like yours.

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18 Posts

02-26-2021

Germany

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  • Message 15 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-06, 4:00 AM

So it looks to be exactly the same issue, you are stuck at a maximum 4.3 GHz rather than 5.3.

 

To answer first your question on temperature after fixing: I see max values of 80-85 in very heavy load. Then there is CPU throttling and drops to 74. Then it rises and so on.

 

Now with the BIOS thing:

 

- my current PC was shipped already with the latest BIOS version O4LKT19A. It might seem very counterintuitive to flash it with the same version but for me this was the fix

- first of all see this link: https://pcsupport.lenovo.com/de/en/products/desktops-and-all-in-ones/legion-series/legion-t7-34imz5/downloads/driver-list/component?name=BIOS%2FUEFI

 

- download the file to your local computer

- to enter BIOS you need to restart or to power on your computer. When you first see Lenovo logo on the screen you have around 2 seconds time to press F12 key before Windows starts loading 

- You need to go to Security tab (left menu), then to select Secure Roll Back Prevention to No (by default it is Yes) - with this setting you can then flash the BIOS with the current version, otherwise this setting prevents it

- Press F10 which means Save and Exit, confirm.

- Let Windows start and execute the file you previously downloaded from Lenovo drivers (o4ljy19ausa.exe). This will flash the BIOS. It takes few minutes so let it run and do not turn off the computer in this time. When the flashing is done the computer will automatically restart. Let the process finalise until you are back in Windows

- Enter BIOS one more time. This time select the Exit tab, choose Load Optimal Defaults and confirm. Then choose Save Changes and Exit (or press F10)

- Check back in Aida64 if there is a change in the clock speed, you should see 5.3 GHz this time, this was my case

 

Let me know how this goes.

 

You should also apply the updates in Windows if you did not do this already - in Windows 10 go to Settings, then Update & Security. Also get the latest Nvidia drivers.

 

 

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14 Posts

03-05-2021

Finland

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  • Message 16 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-06, 5:49 AM

Thank you so much for detailed instructions. I will follow those steps later today and let you know how it goes.

 

I really hope it works!

 

Best,

Juha

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14 Posts

03-05-2021

Finland

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  • Message 17 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-06, 11:37 AM

You are the best!

 

It worked great and now I got Cinebench R23 multi core score 15178!

 

It starts around 4.9 GHz and then to the end it drops 4.3 GHz. Maybe because of the heat. It goes now around 80-90C under heavy load, but goes quickly back to under 40C when benchmark ends. Maybe it needs better cooler for CPU like Noctua NH/D15 to keep going without dropping down.

 

Thank you so much. You saved me.

 

 

Best,

Juha

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18 Posts

02-26-2021

Germany

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  • Message 18 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-06, 11:50 AM

I am very happy this helped!

 

For this reason I was about to return the PC. I am happy I found this fix after exhausting all other possibilities. Flashing the BIOS with exactly the same version sounds strange anyway.

 

I really would like to understand what the issue is, but only Lenovo engineers would have the answer. I hope they visit this area.

 

My guess is a batch of computers were flashed in the factory with the wrong BIOS file, who knows... The fact that the other system worked just fine from the beginning is also strange, that one was originally shipped with 18A.

 

 

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3 Posts

03-12-2021

United States of America

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  • Message 19 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-12, 13:29 PM

What was the specific setting you disabled in order to reflash with the same version?

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18 Posts

02-26-2021

Germany

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  • Message 20 of 22

Re:Legion T7 34IMZ5: i9 CPU max clock speed issue

2021-03-12, 13:34 PM

You need to go to Security tab (left menu), then to select Secure Roll Back Prevention to No (by default it is Yes) - with this setting you can then flash the BIOS with the current version, otherwise this setting prevents it

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