CPU-Z and Core Temp "Core Multiplier" readings different under load

CPU-Z and "Core Temp" both agree that my bus speed is 133 mhz
But they greatly disagree about the core speed multiplier depending on loading
This is really cool

I use a free utility called "Intel Processor Identification Utility" to generate Full Load
When run, it Loads all the Processor Cores to 100% and reports Processor Speed and other details
As shown here (click to enlarge)


Using CPU-Z ver 1.56 and Core Temp Ver .998
Both say they are 64 bit versions

"CORE MULTIPLIER" VALUES WHILE CPU IS IDLING
-------------------------------------------------------
"Core Temp" values "bounces around" 19 thru 26
CPU-Z values "bounces around" 28 thru 30

"CORE MULTIPLIER" VALUES WHILE CPU IS 100% FULLY LOADED (all 6 cores)
--------------------------------------------------------------------------------------------
"Core Temp" values 29.5 to 30
CPU-Z value at 30

Bios "core multipliers" set to 29
So Multiplier increases under load !!!! I guess thats the turbo - boost ?????

But neither CPU-Z nor Core Temp "Loads" Processor at all

So How can CPU-Z correctly calculate the "loaded" multiplier and "Core Temp" cannot ??
Also wondering how Intel Proc ID Utility can load all cores to 100% ??? (heavy duty software loop)

See Diagram Below (click to enlarge) The CPU usage Gadget calls my 12 "threads" cores
but there are just 6 cores with 2 threads apiece

ryan9939 said:

Hmm since it doesn't appear that you have an off the shelf motherboard, I can't really look in the manual. I would suggest you try turning off Turbo Boost in the BIOS and see what happens with your multiplier. I would also shut off the energy saving features on your board to see what happens as well.

The energy saving features are all shut off - I think it may be the "Speedstep". And you're right Ryan, it definitely is a "custom" MB and not one available "off the shelf". I have read (and been told) that Alienware's MB is made by Intel but who knows ??? :):):)

sygnus21 said:

Uh yes, you multi will increase to the highest set in the BIOS under load, and decrease when not under load. This is normal if you have speedstep enabled. The reason you see them jumping around in the images you present is because you are running at different frequencies (speeds). BTW this is not a function of Turbo mode but speedstep.

thehappyman said:

Bios "core multipliers" set to 29
So Multiplier increases under load !!!! I guess thats the turbo - boost ?????

In this instance, yes, when it increases from 29-30, that's turbo kicking in.

Here's my CPU-Z reading....

My i7-950 resting.....


Under load.....


Notice the multipliers.... at rest its 12, at load its 24. Incidentally the max for this CPU is 24, however the rated default speed is 3.06 (23 x 133), (when kicked in to "turbo" in moves to 24 - 24 x 133 = 3.192.



BTW there's also another way turbo kicks in as well, but I don't have a full grasp of it.

I see the truth of it Sygnus1 - it's the "SpeedStep" - And not the Turbo Boost. And I see your multipliers literally doubled under load. Wow - amazing. :):):)