Why Windows 10 locks processor's base frequency to 2.39Ghz when i have 3Ghz cpu?

[onkar-gh]

I have intel core2 duo E6850 with 3Ghz base frequency but after installing Windows 10 (had windows 7) the processor never goes upto that mark, even when I am running heavy apps like Andoid Studio the max frequency is about 2.4Ghz. The task manager shows the same as base frequency while the processor's actual base frequency is 3Ghz. Here is the screenshot of Task manager:

 

I checked the frequency using HWiNFO while running stress test (in case task manager showing wrong info) and here is the snap:

 

I googled about it and have already tried following and NONE of it worked:

1. setting power option to high performance

2. changing max and min performance values of power plan

3. modifying start value of intelppm in registry to 4

4. running cmd command "ren intelppm.sys intelppm.sys.bak"

5. using throttlestop and unchecking "BD PROCHOT"

What works is that when I boot from linux live usb (Zorin OS) I was able to perform tasks and use upto that 3ghz frequency speed. I don't understand why Windows 10 cannot do that? Should install windows 7 again or perhaps linux?

[Jurrunio]

what board is this? It's running FSB at 266MHz rather than 333MHz the CPU is based on, effectively underclocking it.

[onkar-gh]

31 minutes ago, Jurrunio said:

what board is this? It's running FSB at 266MHz rather than 333MHz the CPU is based on, effectively underclocking it.

I really am not sure cause I couldn't find the model number but I think it is zebronics 945. Thanks, I did notice that before !!  I have all BIOS settings already to optimal defaults. I have BIOS AMI 8.00.15. I don't know much about that Any way to fix this @Jurrunio?

[Jurrunio]

32 minutes ago, onkar-gh said:

Any way to fix this @Jurrunio?

Raising the FSB, but if the board is indeed on 945 north bridge going past 266MHz FSB is considered an overclock and not guaranteed to be stable if work at all.

[onkar-gh]

1 minute ago, Jurrunio said:

Raising the FSB, but if the board is indeed on 945 north bridge going past 266MHz FSB is considered an overclock and not guaranteed to be stable if work at all.

Thanks, I guess I have to overclock cause the PC is just too slow and I am running WSL2 and android studio like apps for educational purpose.

[onkar-gh]

9 hours ago, Jurrunio said:

Raising the FSB, but if the board is indeed on 945 north bridge going past 266MHz FSB is considered an overclock and not guaranteed to be stable if work at all.

Hi again @Jurrunio, SORRY for bothering again, but how do I raise FSB there is no option in BIOS for that I have AMI BIOS 8.00.15

[WkdPaul]

* thread moved to the Troubleshooting section *

[Jurrunio]

10 hours ago, onkar-gh said:

Hi again @Jurrunio, SORRY for bothering again, but how do I raise FSB there is no option in BIOS for that I have AMI BIOS 8.00.15

AMI BIOS is customized by whoever made the board, possible that the board vendor didnt want the user to mess with such thing so they removed the option.

 

There sre old software like setFSB that you can try.