Question Intel i5 9400f windows only seeing 4 cores

[boyka11]

I bought an intel i5 9400f. My old CPU was an i3 8100. My pc says that I have 6 cores, but my windows sees it as 4 cores. I looked at device manager it shows 6 cores, but on task manager it shows 4 cores. I tried Cinebench R15 and the score is 600. Normally the I5 9400f shows scores 900.

Intel i5 9400f
MSI H310M Pro VDH+
Gtx 1660 Ti 6gb
240gb ssd
DDR4 8gb Ram

 

[COLGeek]

Is your motherboard BIOS the most recent version?

 

[SkyNetRising]

Check msconfig boot/advanced options.
Number of processors check-box should be unchecked.

 

[boyka11]

Fixed it. Just had to reset windows.