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Help with CPU and Core Speed

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23 Aug 2005
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Cheadle, Cheshire
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Just installed these:

Gigabyte Z68AP-D3
2500K

Now, in the BIOS i have upped the multiplier to 42. However in CPU-Z it shows the core speed as 1604.7 MHz (x 16) and only now and then "shoots" up to the settings above! It then goes right back down.

Anyone care to shed any light please?

Also how do i change the Voltage in the BIOS? I have tried to run Prime95 on 4600 MHz and it failed witha BSOD!

Cheers :)
 
stulid said:
You want the latest version "beta" of CPu-Z other wise it reads the wrong voltage.



This might help,

Untitled9.jpg


The top number set at 40 with Turbo disabled gives you 4ghz all the time.

The top number left at 33 (stock value) with the turbo figures set to 40 each, gives you 4GHz as you need it.
Click to expand...

Cool - thanks as always Stu.

On this board though where do i increase the CPU voltage to 1.325 levels?
 
stulid said:
Advanced Voltage settings, CPU Vcore.
Click to expand...

So, Stu....

The Turbo Boost

Find out what your max overclock is etc, then set this on the Turbo Boost values. The CPU clock Ratio at 33 and then the overclock will "boost" in when you need it, to a MAX of what you put in teh Turbo Boost boxes?
 
stulid said:
Your getting close to where I would stop, just a few more degrees or so, certainly i wouldnt want to be seeing a 80 reported, luckily no normal programs/usage will push the CPU like Prime does.
Click to expand...

Too late....

Nothing like hindsight and experience.

I pushed it up to 4.7MHz and same Voltage. Now it wont boot into the BIOS, it tries then gives up and restarts, tries and restarts....

Ooops
 
stulid said:
When it starts up, switch the PSU off at the wall. leave it for 30 seconds-1minute, turn back on.
Click to expand...

Just doing that matey, what happened btw? and how does this solve it?

EDIT: Not worked mate? :(
 
Last edited:
stulid said:
It should try a boot up and moan that its recovered from a bad overclock and asks you to enter the BIOS, it may then bring up another Red box and have a moan again and it will try and go back to the last good settings.
Click to expand...

I will keep it off a bit longer.

Now i know why people say "small increases":D

What happens if it cant boot back in?
 
stulid said:
Have to wip the Battery out and then leave it for a minute.

You did switch the power off as soon as it tried to start up? not when it turned off?

What Vcore and LLC did you set?
Click to expand...

Yeah did as you said matey.

The Vcore was +0.06 and the LLC i did not touch.

I will give a few more goes and then do as you say. I will then keep it at the stable clock i had before.
 
Ok, i reckon its a MOBO reset. Is that what you mean battery out etc?

If so, will do this tomorrow. Time for bed.

Thanks Stu, your help as always is much appreciated.
 
Woooohoo. Had to take battery out.
Back at 4.6, 1.344, Prime 95 for 4 hours. Cheers Stu
 
Last edited:
stulid said:
Did you save the working OC settings as a profile? its useful as it saves adjusting everything again like the SATA controller from IDE to AHCI etc and it gives you something to work from.
Click to expand...

I didnt mate no, will do for this one.

What is that adjustment you mention above? SATA from IDE to AHCI????
 
4.6GHz at 1.325 crashed after 2 hours in Prime95.

Lowered to 4.5GHz, same voltage and run Prime95 again.
 
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