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-   -   i7 3930K only recognized as 4 cores (Solved) (https://www.hardwarecanucks.com/forum/cpus-motherboards/50484-i7-3930k-only-recognized-4-cores-solved.html)

siegfx January 15, 2012 01:39 AM

i7 3930K only recognized as 4 cores (Solved)
Hi guys, I just realized that my 3930K is only recognized as 4 cores and 8 threads...
CPU-Z shows only 4 cores, same thing with core temp.
What's going on here?
Is this normal?

Jake_HT January 15, 2012 01:55 AM

Did you just get a new cpu in an existing build? uninstall all processors from device manager and reboot.

siegfx January 15, 2012 02:02 AM

I did that, It installed new driver, restarted, and it still shows 4 cores =(

Supergrover January 15, 2012 02:18 AM

Bios at latest version? What Board?

siegfx January 15, 2012 02:19 AM

I haven't checked the bios version yet, it's on Rampage IV Extreme (on my system specs).
Would bios version effect it this much? it's a pretty recently released board though

Edit: Just updated to the latest Bios, and it still shows 4 cores only
Current bios is 1101

jumpload January 15, 2012 03:24 AM

best guess, check bios settings.

Meny bios let you turn on\off the Hyper-threading


siegfx January 15, 2012 03:36 AM

The question is, why would I want to disable hyperthreading?
Currently I only have 4 cores detected, and 8 threads, where I should have had 6 cores and 12 threads..

Anyone else got any problem with this?
I have actually seen a youtube video showing the same version of CPU-Z with 3930k showing 6 cores and 12 threads.
Edit: here's the youtube link Sandy Bridge-E i7 3930K Cinebench 10 - stock clock - YouTube

I've had all cores activated on bios too


G777 January 15, 2012 07:55 AM

Does task manager show 4c/8t as well?

frontier204 January 15, 2012 08:09 AM

Are any cores disabled in BIOS? Try clearing the CMOS and try again.

What does a Linux Live CD tell you? You can get the number of cores in any Linux by typing

cat /proc/cpuinfo
into a terminal. I'm not quite sure whether it will list real cores or HT cores, but anyway if it lists 6 or 12 you're good.

Coach January 15, 2012 09:31 AM

If you run cinebench or AIDA 64 cpu queen does your cpu score properly or are your scores down from what it should be?

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