Why Cpu-z shows max ratio values in idle c-state?

[Shifter3000]

I have a : i5 750 2,67 Ghz rev B1, Asus p7p55d-e , Gigabyte Radeon 5770,2X Kingstone 2gdr 1600Mhz CL 9-9-9-9-24...

Maybe is not a very important thing but why is my CPU-Z showing the max CPU ratio with my c-state and speedstep on in idle?
Core temp and other programs shows the real values.

is it a bug ?

this thing happened from yesterday after a little OC tests... no more then 3,6 Ghz at 200 BCLK speed... max
i tried many cpuz ver. but the same thing.

Any advice is welcomed.



* and the auto voltage set the V core at 1,251 idle and up to 1,268 full tortured with prime95... is the voltage ok or is to high ?

 

[wolfram23]

Yeah it's just a CPUZ issue I've had it too. Nothing to worry about. You might consider downloading the Intel Turbo Boost monitor gadget for Windows it's pretty handy/fun

Your vcore is fine, what's your vtt? Shouldn't go over 1.21V Vtt (Intel spec) I fried a motherboard at 1.28V Vtt lol (although some people can run it, might have been bad luck)

 

[cromedome]

Yeah it's just a CPUZ issue I've had it too. Nothing to worry about. You might consider downloading the Intel Turbo Boost monitor gadget for Windows it's pretty handy/fun

Your vcore is fine, what's your vtt? Shouldn't go over 1.21V Vtt (Intel spec) I fried a motherboard at 1.28V Vtt lol (although some people can run it, might have been bad luck)

May I just add that Intel's max VTT spec for i5 750 is actually 1.4v

 

[wolfram23]

May I just add that Intel's max VTT spec for i5 750 is actually 1.4v

Ok well I definitely, DEFINITELY, read 1.21V Vtt and 1.55V Vcore in the Intel documentation which I checked several times... I just went to the site, opened the documentation, and am surprised to see they did indeed change their voltage specs! (First page is listed as June 2010 release)
http://download.intel.com/design/processor/datashts/322164.pdf

Vcore and Vtt are max spec 1.40V now.

I'm going to search to see if there's any info why it's changed...

(To support my claim you can see this thread http://forums.anandtech.com/showthread.php?t=332659)

 

[Shifter3000]

First of all thx for the post and help this is my first post on Tom.

So there is no chance that Cpuz will go back to show c-state in idle?

But more important!

Im a nab in OC so i dont understand very well "Vtt" where can i see it

i have in voltages in bios : core,IMC,DRAM,PLL,PCH

thx for the post

 

[wolfram23]

Vtt is IMC, just some BIOSes label it differently.

 

[Shifter3000]

3,6 Ghz X18 ratio , BClk - 200, Ram 1600, QPI - auto, pcie - 100 (turbo off,cstate on)
core - 1,264, Imc(vtt) - 1,265, dram - 1,643, Pll - 1,821, Pch - 1,053 BIOS ref

so what do you think? is over 1,21 V thats for sure

 

[wolfram23]

3,6 Ghz X18 ratio , BClk - 200, Ram 1600, QPI - auto, pcie - 100 (turbo off,cstate on)
core - 1,264, Imc(vtt) - 1,265, dram - 1,643, Pll - 1,821, Pch - 1,053 BIOS ref

so what do you think? is over 1,21 V thats for sure

Looks ok, but I'm sure you could lower Vtt a bit.

Also, turns out Intel changed the i5 750 voltage specs as of June 2010, now the max vcore is 1.40 and the max vtt/imc is also 1.40.

 

[Shifter3000]

Thx

http://www.tomshardware.co.uk/forum/256144-11-1156-core-overclocking-guide

there is a guy here that has a guide with stable OC config at 3,8 Ghz with Voltages that my mobo on auto generously gives at 3,6 Ghz (he has a vtt much lower then mine at 3,6 Ghz ) )

3.8GHz:
Load-Line Calibration: Disabled
Vcore= 1.264V (CPU-Z idle)
QPI/Vtt/IMC= 1.149V
PCH= 1.10V
PLL= 1.85V
RAM= Specified voltage for your RAM

so can i input manually this values and see what will happen ?

=>

3.6GHz24hrs Small FFTs test, 30hrs-2mins Large FFTs test and 14hrs-12mins Memtest86+ stable!)
Load-Line Calibration: Enabled (or Level2 for Gigabyte GA-P55A-UD5)
Vcore= 1.20V (CPU-Z idle)
QPI/Vtt/IMC= 1.14V
PCH= 1.10V
PLL= 1.80V
RAM= Specified voltage for your RAM

)

 

[wolfram23]

If your voltages are all on auto, I would use that as a starting point and lower from there. Start by lowering Vtt and running Intel Burn Tests (say 10 passes at High stress) and continue until it fails... do the same with Vcore. Obviously set them to a value that didn't fail. Then run Prime95 small FFTs for IMO 8 to 10hrs)

 

[Shifter3000]

Wolfram23 ... thx allot i'll put this info to good use

About the Thread's issue if you have the time for 1 post ... is there a chance for CPUZ to show the real CPU multi with c-state

if not i'll use Intel Turbo Boost

 

[wolfram23]

Wolfram23 ... thx allot i'll put this info to good use

About the Thread's issue if you have the time for 1 post ... is there a chance for CPUZ to show the real CPU multi with c-state

if not i'll use Intel Turbo Boost

CPUZ is just kinda wierd lol. It generally shows the right speed but can take a while to update, sometimes it seems stuck. I'd go with what CoreTemp reads as it seems very accurate, or like I said before you can download the Intel Turbo Boost gadget which is fun to watch.