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I7 975 EXTREME 3 different clock speeds reporting??

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SYN_Repent

New Member
Joined
Feb 28, 2017
Hi all, first post here

So, im not some overclocking pro, but i have dabbled over the years, anyway, ive got an old system with a I7 975 EXTREME which i thought i could have some over clocking fun with, so im currently sitting at 4.1ghz stable, but i have three speeds being reported, CPU-Z says 4.1ghz (27x152) REALTEMP says 4.26ghz (27x158) and in task manager performance it says 3.53ghz...............

Why would this happen?

uploading pictures

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image upload
 

idkfa

Member
Joined
Feb 7, 2013
You can use the snipping tool to make screenshots ;)

Untitled.png

Task Manager read 4.8 Ghz when I was at 4.0 Ghz, didn't actually notice that I was running a whooping 5.5 Ghz as of now ;)

My advice would be to trust CPU-Z the most, forget about task manager.

What BUS Speed did you actually set in the BIOS? That seems to account for the difference from realtemp to cpuz.
 

idkfa

Member
Joined
Feb 7, 2013
Then I'd say CPU-Z reports the clock speeds correctly, as I assumed. As to why the reports / readings differ: no idea :confused:
 

trents

Senior Member
Joined
Dec 27, 2008
Taskmanager is just probably reporting the factory base frequency.
 

Evilsizer

Senior Forum Spammer
Joined
Jun 6, 2002
windows doesnt always correctly read the cpu speed since it is overclocked, i have had this happen on xp/win 7, i dont use win10 at all on my main. i do have a x58 setup i installed win7 on and tried the free update to 10 and same thing, it doesnt read the new cpu speed for me. there could be a reason it doesnt work for me but might for others, thats not something i looked into. as i always suggest going by the bios cpu speed reading as it will also match CPUZ reading.