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I7 920 D0 VCore readout

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itsgrandpa   01-21-2012 at 12:07:09 AM

Hey guys,
I've been playing around with my i7 920. I was able to get a modest 3.4ghz @ 1.100 volts. Today I bumped the Vcore to 1.200 and i have a stable 3.8ghz that's been stressing for 7 hours now (oddly its at the same temps @3.4ghz)

In my BIOS I set the Vcore to 1.200. But at 100% load, CPU-Z is showing my core voltage is @ 1.144.
Am I able to drop by BIOS Vcore just above the threshold of the CPU-Z reading?

For reference, I did not enable Load-Line Calibration.
Thank you.

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itsgrandpa   01-22-2012 at 10:15:22 AM

When the multiplier bumps to 22.0 I reach 4.0 gigahertz.
http://i.imgur.com/iIEX7.jpg


Message edited by itsgrandpa on 01-22-2012 at 10:18:12 AM
------------------------------ i7 920 D0 | Reference 5870 | p6t v2 | 850HX | 6GB OCZ | Intel 320 160GB | 1TB caviar black | 1TB caviar green | 2TB caviar green
 Reply to itsgrandpa
omgitzfatal   01-22-2012 at 12:22:27 PM

Your seeing the effects of Vdroop

If you would like to know what vdroop is, have a read here: http://www.thetechrepository.com/showthread.php?t=126

To answer your question, No you cannot adjust the BIOS Vcore to match (or be slightly higher than) the CPU-Z Vcore reading. Though you could increase load-line calibration to lessen the effects of Vdroop

------------------------------ Core i7 3930K @ 4.6Ghz - 8GB 1866Mhz 7-9-7-24-1T - Gigabyte X79-UD3 - 1000W XFX Pro Platinum - Modded ATCS 840 - Custom Water - Corsair Force 3 120GB
 Reply to omgitzfatal
LegendKiller   01-22-2012 at 12:33:36 PM

There's no 22x multiplier in a i7 920, there's only 21x in 920...
Put your CPU at 21 multiplier and put BCLK at 191 which is 4GHz and put your VCORE at 1.34v

Reply to LegendKiller
omgitzfatal   01-22-2012 at 01:03:02 PM

If OP's CPU is stable at 3.8Ghz with 1.2V then I doubt it would need 1.34 or 1.40V for 4Ghz...

------------------------------ Core i7 3930K @ 4.6Ghz - 8GB 1866Mhz 7-9-7-24-1T - Gigabyte X79-UD3 - 1000W XFX Pro Platinum - Modded ATCS 840 - Custom Water - Corsair Force 3 120GB
 Reply to omgitzfatal
itsgrandpa   01-22-2012 at 07:44:26 PM

Dropped Vcore to 1.8125

I'm not sure but mine occasionally hits 22x
http://i.imgur.com/xHpah.jpg

It seems CPU-Z and CPUID Hardware Monitor readings are not very accurate. Is there another monitoring system that someone would recommend.

Wow thank you Fatal, I'm reading the post right now... very informative!!

Also to clarify, is the actual voltage closer to what I set in the BIOS (1.20v) or what the readings from CPU-Z/CPUID HW monitor (1.14)


Message edited by itsgrandpa on 01-22-2012 at 07:48:08 PM
------------------------------ i7 920 D0 | Reference 5870 | p6t v2 | 850HX | 6GB OCZ | Intel 320 160GB | 1TB caviar black | 1TB caviar green | 2TB caviar green
 Reply to itsgrandpa
LegendKiller   01-22-2012 at 08:11:36 PM

Software are not accurate, cant solve that... AIDA64(Which is the best in my opinion) shows 1.328v awhile in BIOS it's 1.34v...
How is it possible for you to get 22x multiplier??????? Also how did you even get 3.9GHz with 1.18v? You must got the best processor(In i7 9xx)... I hope you can show us if you can get 5GHz with 1.4v-1.44v

EDIT: You can use HWMonitor which should show your Vcore voltage when run max... So far HWMonitor is showing 1.34v for my voltage...


Message edited by LegendKiller on 01-22-2012 at 08:16:37 PM
Reply to LegendKiller
omgitzfatal   01-22-2012 at 09:29:54 PM

CPU-Z is generally pretty accurate, its just really differcult to get the same Vcore value in CPU-Z as you have in the BIOS as your motherboard would need very high quality power phase design and 100% LLC.

I think (not 100% sure) that the value in CPU-Z is what is being pushed through your CPU rather than what its set in the BIOS.

Oh and well done on your overclock, although you haven't got HT on, its still a very good CPU, my old Core i7 950 needed 1.41V for 4Ghz :(

------------------------------ Core i7 3930K @ 4.6Ghz - 8GB 1866Mhz 7-9-7-24-1T - Gigabyte X79-UD3 - 1000W XFX Pro Platinum - Modded ATCS 840 - Custom Water - Corsair Force 3 120GB
 Reply to omgitzfatal
itsgrandpa   01-22-2012 at 10:12:51 PM

@omgitzfatal Everything you said is on point. I turned HT off since I only play SC2 which does not utilize the extra threads.
I finish reading the post on Vdroop... twice ... I'll assume since I don't have a background in EE may be partially why I had difficulty understanding it.

I may be talking out of my rear but what I got from it was Vdroop creates an upper and lower bound providing a narrowed window of voltage to feeding stable power to the CPU. (okay, i really didn't understand it at all, please correct me)


Ran AIDA64 - seems consistent with the other programs.
http://i.imgur.com/kg3cD.jpg


Message edited by itsgrandpa on 01-25-2012 at 06:19:41 PM
------------------------------ i7 920 D0 | Reference 5870 | p6t v2 | 850HX | 6GB OCZ | Intel 320 160GB | 1TB caviar black | 1TB caviar green | 2TB caviar green
 Reply to itsgrandpa
itsgrandpa   01-27-2012 at 08:26:48 AM

I was playing around with the Vdroop but didn't like it since it left the possibility of frying my CPU and the power occasionally cuts out randomly at my college.

Looks like 3.8 is the sweet spot =(
3.8 @ 1.6 volts <50C
4.0 @ 1.9 v <60C
4.2 @ 2.2125 v <65C

Temps stayed below 50 at 3.8 with HT off. 4.0 kicks it near the 60's range which is a bit high for me.

Message quoted 1 times
------------------------------ i7 920 D0 | Reference 5870 | p6t v2 | 850HX | 6GB OCZ | Intel 320 160GB | 1TB caviar black | 1TB caviar green | 2TB caviar green
 Reply to itsgrandpa
LegendKiller   01-27-2012 at 02:59:49 PM

itsgrandpa wrote :

I was playing around with the Vdroop but didn't like it since it left the possibility of frying my CPU and the power occasionally cuts out randomly at my college.

Looks like 3.8 is the sweet spot =(
3.8 @ 1.6 volts <50C
4.0 @ 1.9 v <60C
4.2 @ 2.2125 v <65C

Temps stayed below 50 at 3.8 with HT off. 4.0 kicks it near the 60's range which is a bit high for me.


Try 5 GHz at 1.35v or lower lol... You probably got the Best CPU ever in the world to reach 5GHz with such low voltage and it's even the first Gen. too LOL...

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