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Tom's Hardware > Forum > Overclocking > General Discussion > CPU-Z shows two CPU frequencies?

CPU-Z shows two CPU frequencies?

Forum Overclocking : General Discussion CPU-Z shows two CPU frequencies?

AMD

CPU-Z shows my 2500k running at 4.0 GHz AND then 1.5 GHz? It rotates, one second it shows 4.0 the next 1.5.

What's going on here?

Reply to challengepower5287

Speed step is enabled.

http://en.wikipedia.org/wiki/SpeedStep

------------------------------ i7 2600K @ 4.5/P67A UD4/Scythe Mugen 2 Rev B/OCZ Vertex 2 120GB/2xWD 640 Blacks/Antec 1200/Samsung 23in LED LCD/EVGA GTX 460/2x4GB GSkill Ripjaws X DDR3 1600 7-8-7-24/Windows 7 Ultimate x64/Corsair 750TX
Reply to anort3

I disabled this, and CPU-Z still shows a varying multiplier. at a 4.5 OC It appears that while idling it's 1.6GHz, and during stability testing anywhere between 4.1-4.5

Message quoted 1 times

Reply to challengepower5287

You sure EIST is disabled? Sandy Bridge is really designed for it to be left on even when overclocking.

I just double checked, it is disabled. as is C1E.

can anything else be causing this issue?

Reply to challengepower5287

If you really want to get rid of the low-power idle states of the CPU, you need to disable EIST, C1E, SpeedStep, and all CStates settings in the BIOS. You may also have to disable Turbo, but I don't know for sure.

Note that hard drive performance may suffer when you do this.

Why would you disable speedstep and c1e????

So you WANT your cpu running at full speed while your checking your email?? Hmmm....

Is your power bill too low?

Message edited by geekapproved on 04-08-2011 at 04:01:28 PM

------------------------------ Core i3-2100/Asrock H61/8GB1333/XFX HD5850oc/WD Black 500/Antec 300/Antec EA380w bronze
Currently playing Deus Ex:HR a second time on Hardcore
Reply to geekapproved

challengepower5287 wrote :

I disabled this, and CPU-Z still shows a varying multiplier. at a 4.5 OC It appears that while idling it's 1.6GHz, and during stability testing anywhere between 4.1-4.5

That is what it's supposed to do, what exactly is the problem again?

------------------------------ Core i3-2100/Asrock H61/8GB1333/XFX HD5850oc/WD Black 500/Antec 300/Antec EA380w bronze
Currently playing Deus Ex:HR a second time on Hardcore
Reply to geekapproved

Everyone else said it, but if you need further convincing, I'll chime in.

Since the Intel Core series of processors, power saving features were implemented. That means your processor will run at a lower clock when you aren't doing anything that taxes the CPU. If you're just checking email or listening to music, you don't need your i5 running at 4 GHz. Your power consumption goes down, too. HWMonitor shows my processor consuming only 3W at idle, and 95W at load.

tldr: There is no issue. That's how it's supposed to work.

------------------------------

http://valid.canardpc.com/cache/banner/1027494.png

I've never encountered this personally, but I've read that disabling C1E and speed step helps an overclocked cpu's stability.

Message quoted 1 times

Reply to challengepower5287

That was actually true before Sandy Bridge. These new chips are designed to have it enabled even during overclocking.

Message quoted 1 times

Quote :

That was actually true before Sandy Bridge. These new chips are designed to have it enabled even during overclocking.

interesting. i used the sticky as a reference, and it suggests to:

Quote :

Disable:

Limit CPUID Maximum
Power Technology
C1E Support
OverSpeed Protection
Spread Spectrum

Enable:

Internal PLL Overvoltage
Execute Disable Bit
Intel Virtualization Tech

given these settings were on an MSI board, and mine being ASRock, it was a little difficult deciphering what needed to be enabled/disabled. but you'd suggest enabling C1E and Speed Step?

Reply to challengepower5287

Mine is enabled and my 4.5Ghz overclock is completely stable. My chip may even go higher but 4.5 is plenty fast for me so I have not even tried for a higher clock.

anort3 wrote :

That was actually true before Sandy Bridge. These new chips are designed to have it enabled even during overclocking.

Well up until yesterday I had an overclocked Q6600 and I never had a problem with it not throttling down.

Message quoted 1 times
Message edited by geekapproved on 04-08-2011 at 07:37:59 PM

------------------------------ Core i3-2100/Asrock H61/8GB1333/XFX HD5850oc/WD Black 500/Antec 300/Antec EA380w bronze
Currently playing Deus Ex:HR a second time on Hardcore
Reply to geekapproved

challengepower5287 wrote :

I've never encountered this personally, but I've read that disabling C1E and speed step helps an overclocked cpu's stability.

If you are pursuing that last 0.1 Ghz of an OC to get your name up on some benchmark ladder, it's worth disabling those features. For all practical use, it made a slight difference on 1156/1366 but much less so on 1155. This OC to 4.6 took less than a minute.

http://www.guru3d.com/article/asus [...] -review/10

- Leave baseclock for what it is right now
- If optional in the BIOS, increase the TDP limit of your processor to 200 Watts
- With a 2600K set your base multiplier at 34
- And now set the per core multiplier at a maximum of your liking, we applied an MP of 46 on all four cores
- Increase CPU voltage, though setting AUTO might work fine, we applied 1.35V
- Make sure your processor is properly cooled (we used the stock Intel cooler and forced the fan to 70% RPM)
- Save and Exit BIOS / UEFI

Message edited by JackNaylorPE on 04-08-2011 at 08:12:48 PM

------------------------------ If a man speaks in the forest and no woman hears him, is he still wrong ?
Reply to JackNaylorPE

geekapproved wrote :

Well up until yesterday I had an overclocked Q6600 and I never had a problem with it not throttling down.

My E8400 at 4Ghz had it enabled as well. I was talking about 1156/1366.

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