I7 975 EXTREME 3 different clock speeds reporting??

[SYN_Repent]

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?

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[idkfa]

You can use the snipping tool to make screenshots



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.

 

[SYN_Repent]

its set to 152 in bios, and on the post/boot screen it shows 4.1ghz too

 

[idkfa]

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

 

[trents]

Taskmanager is just probably reporting the factory base frequency.

 

[Evilsizer]

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.