Question Only two cores working in windows on Athlon x4 750k

[RabbitSK]

So my friend bought the CPU mentioned in the title. All 4 cores are shown in BIOS and Device Manager, but only two are working. CPUz says that the CPU has 2c/2t and score in Cinebench R15 is half of what it should be. Could reinstalling Windows 7 fix the problems.
His specs:
Gigabyte F2A58M-S1
4GB 1600MHz Single Channel RAM
GT 730 2GB GDDR3
500W PSU, dont know which one exactly

 

[Roland Of Gilead]

Yes, it may fix the issue. When installing a new major piece of HW like a CPU or mobo, I do a fresh install to make sure it works fine. Its possibly just left over code that windows can't ditch to show the correct info of the new CPU>

 

[tylerd120]

Most likely half of the cores are disabled in the bios. If you know the motherboard model I could walk you through checking the bios.

 

[Roland Of Gilead]

Most likely half of the cores are disabled in the bios. If you know the motherboard model I could walk you through checking the bios.

Well, OP mentions 4c show in the bios, but they may have disabled SMT somehow, so that could be the reason. Its also worthwhile to update CPU-z to the latest version, and to do a bios up date too, before an OS install.

 

[tylerd120]

Well, OP mentions 4c show in the bios, but they may have disabled SMT somehow, so that could be the reason. Its also worthwhile to update CPU-z to the latest version, and to do a bios up date too, before an OS install.

Agreed. Setting bios values to default could be a good start.

 

[RabbitSK]

Well he did have a dual core cpu before this one so i will tell him to reset the bios and reinstall windows

 

[RabbitSK]

Well, OP mentions 4c show in the bios, but they may have disabled SMT somehow, so that could be the reason. Its also worthwhile to update CPU-z to the latest version, and to do a bios up date too, before an OS install.

Bios and cpuz are updated.

 

[popatim]

And the results are???

 

[boju]

Check msconfig before reinstall Windows.

Type msconfig in the start bar. Navigate to Boot > Advanced options > and see if Windows has checked number of processors. If it has been ticked, untick it and reboot. Sometimes Windows can tick this box if there's been a cpu change.

 

[Roland Of Gilead]

Bios and cpuz are updated.

To be sure, do a CMOS rest after the bios update. If that fails to show the CPU correctly and/or the software update for CPU-z doesn't work, then I would just go ahead and re-install the OS. Make sure to back up your data before you do, and do a clean install (rather than a repair). See how you get on.

 

[RabbitSK]

So it's not bios it's the OS. I told my friend to reinstall windows and i will share results once he does that.

 

[Roland Of Gilead]

So it's not bios it's the OS. I told my friend to reinstall windows and i will share results once he does that.

Let us know.