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2600k CPUz Voltage Confusion

post #1 of 26
Thread Starter 
So I finally jumped from a Phenom to the beastly 2600k, everything's great and I recently put my hand to overclocking. Got it up to 4.5ghz @ 1.325 v, prime95 testing is stable. However, in CPUz, core voltage reads as "1.200v" when I run stress tests. As soon as the test ends, voltage goes up to "1.288", and speed falls down to 1.6ghz.

I understand the speed going down as the CPU isn't being utilized, but what's up with the voltage? I'm using an ASRock z68 extreme 3 gen3 with 8gb of gskill ram. Would appreciate any feedback, thanks in advance.

THREAD REVIVAL: Didn't want to make a new thread so I'll continue here. I'm still having trouble with CPU load line calibration.

CPU voltage is set to 1.325. With load line calibration at level 2, idle voltage sits at 1.288v. Under stress it falls down to 1.200v for some reason and I fail prime95 testing. At level 1 calibration, vcore stays near 1.325 all the time. At idle, core clock drops to 1600mhz but voltage doesn't change.

So basically am I missing something here or is this just a useless feature? What do I have to do to have my CPU running at 100% core/vcore at load, and throttle core/vcore at idle?
Edited by naizarak - 1/29/12 at 10:29pm
post #2 of 26
Go into EUFI and disable Intel speedstep, and C1E power states
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post #3 of 26
Thread Starter 
Quote:
Originally Posted by Lazloisdavrock View Post

Go into EUFI and disable Intel speedstep, and C1E power states

I've disabled both and now the CPU runs at a constant 4.5ghz but voltage readings are still off. Idle voltage is 1.28 and load is 1.20. Might it have anything to do with PLL? Load-line limit? The "C" states?

lol i'm just listing everything in the bios now.
post #4 of 26
Quote:
Originally Posted by Lazloisdavrock View Post

Go into EUFI and disable Intel speedstep, and C1E power states

No. doh.gif

Speedstep and C1E are a GOOD thing. Leave them enabled.

The reason your voltage is off is due to LLC. Raise your LLC level up. What motherboard are you using?
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post #5 of 26
I dont like my chip downclocking smile.gif

hes using the ASRock z68 extreme 3 gen3
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post #6 of 26
Thread Starter 
Quote:
Originally Posted by pioneerisloud View Post

No. doh.gif
Speedstep and C1E are a GOOD thing. Leave them enabled.
The reason your voltage is off is due to LLC. Raise your LLC level up. What motherboard are you using?

The LLC was the problem. I had it on using Level 5, but apparently it works in reverse. Switching to Level 1 keeps the voltage at a constant 1.3-1.35v. Now I think I'm having a problem with Speedstep. I enabled it and left everything on "Auto", and the chip won't run faster than 3.8ghz. I'm guessing there's some sort of thermal throttling going on with speedstep.
post #7 of 26
Quote:
Originally Posted by naizarak View Post

Quote:
Originally Posted by Lazloisdavrock View Post

Go into EUFI and disable Intel speedstep, and C1E power states

I've disabled both and now the CPU runs at a constant 4.5ghz but voltage readings are still off. Idle voltage is 1.28 and load is 1.20. Might it have anything to do with PLL? Load-line limit? The "C" states?

lol i'm just listing everything in the bios now.

That is vdroop that is taking place when it goes under load, normal thing that happens. Keep speedstep and C1E off as they will mess with your overclock, no need for them to be on unless you are trying to conserve power.
post #8 of 26
Quote:
Originally Posted by Lazloisdavrock View Post

I dont like my chip downclocking smile.gif

hes using the ASRock z68 extreme 3 gen3

It's not just downclocking, its undervolting too. It gives you more life on the chip that way. wink.gif Do you think I'd be running 1.51v through mine all the time? No way!! That's why I stick with C1E and Speedstep enabled. I can get a higher overclock that way, and its safer.

I've never used the ASRock Extreme3 Gen3. But try setting your LLC level to somewhere right in the middle. You don't want it TOO high, because then you'll get idle BSOD's. If you set it too low, you'll have exactly what you've got going on right now.
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post #9 of 26
If you're using an ASRock board then it'll likely behave similarly to ASUS boards. For LLC, Ultra High (75%) seems to be the sweet spot.
Edited by MercurySteam - 1/14/12 at 7:34pm
post #10 of 26
Quote:
Originally Posted by MercurySteam View Post

If you're using an ASRock board then it'll likely behave similarly to ASUS boards. Ultra High (75%) seems to be the sweet spot.

With my setup, "High" is the sweet spot (right in the center). Ultra High, I get idle BSOD's, and with Extreme.

And no, Speedstep and C1E don't screw with the overclocks. If they did, I wouldn't be at near 5GHz. All they do is save power when idle, which in turn, saves extra life on your chip. The switch from idle 1.6GHz to overclocked is near instant anyway. You NEVER can even tell that its on honestly.
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Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
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