[Solved] unblock CPU for QX-9650 & E8400

[jsl2000]

But due to over-heat problem the PC will shutdown about 1~ 2 sec later before I can edit anything in BIOS.

So I can't help you without knowledge of POST-error messages with new CPU.

After solving over-heat problem of CPU I can load Windows 10 now.
But even edit the values in BIOS (333 x 9 = 3.0 GHz) it still got wrong CPU frequency (266 x9= 2.67 GHz) of E8400 as shown in the attached pictures:
Can you help to fix it ?

[jsl2000]

Current problem is E8400 CPU's FSB was incorrectly identified by BIOS.
It should be 333 instead of  266 as shown in the attached pictures or 1333 instead of 1066 :

[DeathBringer]

After solving over-heat problem of CPU I can load Windows 10 now.

Overheating isn't BIOS problem.
Post a screenshot of regedit with expanded key HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0

It should be 333 instead of 266 as shown in the attached pictures or 1333 instead of 1066 :

Do Load Defaults in BIOS.
Make a screenshot of HWMonitor with full CPU load.

[jsl2000]

After solving over-heat problem of CPU I can load Windows 10 now.

Overheating isn't BIOS problem.
Post a screenshot of regedit with expanded key HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0

It should be 333 instead of  266 as shown in the attached pictures or 1333 instead of 1066 :

Do Load Defaults in BIOS.
Make a screenshot of HWMonitor with full CPU load.

Thanks for your help & advice.
Actually the original BIOS F12 does support E8400 E0, but it was shown "Not Supported" in Gigabyte's CPU Compatibility Table.
My previous problems after changing E6600 to E8400 CPU were all related to over-heating issue of hardware instead of BIOS issue.
After fix it my GA-965P-DS4 (2.0) can boot E8400 normally at 3.0 GHz (333 x 9) now.
What I actually need now is addition of UEFI Boot Option in this BIOS.
So I should request this in the other sub-forum instead of this one.