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3570k Ideal Voltage for 4.5GHz

post #1 of 11
Thread Starter 
Currently I have Prime95 running at max CPU Stress level, CPU-Z tells me the Core Voltage (Vcore) is 1.144v occasionally dropping down to 1.136v. I have an AsRock Z77 Extreme4 MoBo with the Vcore offset at +0.005v and the Turbo Boost offset at +0.008v, LLC is also at Level 3. The frequency I have is 4500MHz (4.5GHz), and I've seen most people who have a 4.5GHz OC using a Vcore of at least 1.20v, yet I'm way below that at 1.144v. I'm fairly sure everything is stable, as I have been running Prime95 for the past half hour with no errors, and my H100 keeps temps below 70 at all times (max 64 celcius), so I can't see any error. The VID in Core Temp tells me that it is 1.1809v, but I'm told that's CPU PLL voltage and not Vcore. Can someone help me out and tell me why my Vcore is so low yet I'm still attaining 4.5GHz? Should I increase the Turbo Offset to something like +0.012 or +0.016?
Edited by x Jakk x - 4/4/13 at 3:15pm
post #2 of 11
This is normal. The extreme4 is notorious for giving improper voltage numbers. If you have offset of 0.005 and turbo 0.008, your probably looking at 1.27v max.
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post #3 of 11
Thread Starter 
So my Vcore is actually somewhere around 1.25v? Is there any other way to check my Vcore since I'm only using CPU-Z right now?
post #4 of 11
I'd say 1.24v-1.25v is average for 3570K at 4.5Ghz.
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post #5 of 11
Quote:
Originally Posted by x Jakk x View Post

Currently I have Prime95 running at max CPU Stress level, CPU-Z tells me the Core Voltage (Vcore) is 1.44v occasionally dropping down to 1.36v. I have an AsRock Z77 Extreme4 MoBo with the Vcore offset at +0.005v and the Turbo Boost offset at +0.008v, LLC is also at Level 3. The frequency I have is 4500MHz (4.5GHz), and I've seen most people who have a 4.5GHz OC using a Vcore of at least 1.20v, yet I'm way below that at 1.44v. I'm fairly sure everything is stable, as I have been running Prime95 for the past half hour with no errors, and my H100 keeps temps below 70 at all times (max 64 celcius), so I can't see any error. The VID in Core Temp tells me that it is 1.809v, but I'm told that's CPU PLL voltage and not Vcore. Can someone help me out and tell me why my Vcore is so low yet I'm still attaining 4.5GHz? Should I increase the Turbo Offset to something like +0.012 or +0.016?

Your VCore is 1.44V for a 45 multiplier? That is way high, and with the unreported voltage provided by the ASRock EXT4 your VCore is probably kissing the heels of 1.5V. I hope that you mean 1.144 or 1.136, which would be significantly more reasonable and on par for having a good chip. I have the same chip/mobo and a 45 multi costs me 1.144V to stabilize. Let us know if that was a typo, because as it is written, you are not in safe 24/7 running.
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post #6 of 11
Thread Starter 
Sorry I did mean 1.144v and 1.136v! So 1.144v is the reading I usually get when running Prime95, which is why I thought it was too low. However, the Extreme4 apparently is notorious for reporting incorrect voltages so I don't know what the actual Vcore is since SpeedFan also reports 1.144v as well as CPU-Z. If it actually is around 1.25v then I'm sure that's fine, since it kept crashing whenever I set the Turbo Boost voltage to +0.004, but it's fine now it's on +0.008. However, it would be nice to go a bit lower, since you use 1.144v for 4.5GHz, but since the Extreme4 reports the Vcore incorrectly I'm not sure what the actual voltage will be.
post #7 of 11
I have to give my i5 3570k 1.280v to run 4.5ghz stable.
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post #8 of 11
Quote:
Originally Posted by x Jakk x View Post

Sorry I did mean 1.144v and 1.136v! So 1.144v is the reading I usually get when running Prime95, which is why I thought it was too low. However, the Extreme4 apparently is notorious for reporting incorrect voltages so I don't know what the actual Vcore is since SpeedFan also reports 1.144v as well as CPU-Z. If it actually is around 1.25v then I'm sure that's fine, since it kept crashing whenever I set the Turbo Boost voltage to +0.004, but it's fine now it's on +0.008. However, it would be nice to go a bit lower, since you use 1.144v for 4.5GHz, but since the Extreme4 reports the Vcore incorrectly I'm not sure what the actual voltage will be.

It sounds like we have identical chips at 4.5. If it holds true and scales like mine, you chip will do 5.0 under 1.400. If you are going to push that hard get a DMM to measure Volts on the back of the board. If you are just going for a mild-moderate overclock (under 1.300V) stay at LLC4 or LLC5 and the voltage will read pretty close to accurate as reported in software.

Here is a chart with my voltage and software readouts, I have 4.7 listed for each of the LLC's, without a DMM you wont know your true VCore, but you can probably ballpark it using some of these numbers.
Warning: Spoiler! (Click to show)

Edit to add: this was before I hacked my chip up with a razor blade and brought the temps down to get the 5.0 mark.
Edited by inedenimadam - 4/4/13 at 7:17pm
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post #9 of 11
I had mine at 1.260V.... but it was a lil wonky when playing games. So might try adding a tiny bit more. @ 4.2 with 1.250V

Every chip is different. tongue.gif
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post #10 of 11
4.5 Ghz / 1.288V here - rock solid stable. I passed every test possible at 1.27V too but **** was crashing in Crysis 2 for some reason. Since ive upped the voltage finished the game without any problems ^^

1.25V for 4.2 Ghz - ugh, i feel sorry for you man. Mine does 4.2 Ghz / 1.11V but as youve said every chip is different...
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