nachtfalke00
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I found a strange VRM behavior every time when the mb is turned ON , the motherboard X79 Dark gives a voltage pulse in CPU every time when pc starts , you can see it ONLY if you monitorizing in real time the cpu voltage on DMM or SCOPE the issue perisist ONLY with bios v2.04 and v2.05 sistem specs: evga x79 dark bios v1.14 , 2.02 , 2.04 , 2.05 , cpu 3930k , 4x4gb tridentX 2666cl10 , vertex4 128gb ssd , PSU AX1200 , AX860i , Evga classified SR2 1200 ( antec tpq 1200 OC) , custom water loop cooler so , what i tried: - i tried with 3 different PSU´s ( ax1200 , evga classified SR2 -antec tpq 1200OC , and AX8601i ) -issue persist . - i tried with 2 multimeters ( fluke 115 , voltcraft VC 270) and a Fluke 289FVF datalogger scope- issue persist -i switch to first bios that board came v1.14 - same settings - issue is not anymore ...the cpu voltage is normal without spike - i updated a bios rom to v2.02 - the cpu voltage is normal all perfect. Conclusion: the issue is ONLY with 2.04 and 2.05 bios .. so it is 100% a bios issue .that can kill ours cpu´s without reason ...because is some going wrong with this board , remember ...every time when you turn ON the motherboard ..cpu take a lot of volts in head for a split second almost 1,7v . the issue persist if you rise the default voltage ...at the default bios value( stock) all is fine ... EVGA bios team what did you done with this board??????? please fix this big problem i have uploaded a video here: http://www.youtube.com/watch?v=p5xZss7bHEU
post edited by nachtfalke00 - 2013/09/30 22:01:44
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linuxrouter
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/09/30 22:13:39
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I have been able to reproduce this on my system using a meter with one of two configurations I tested so far.
BIOS 2.04
39x103 - VCore 1.00 - VDroop Disabled - Startup CPU voltage - 1.011v
44x103 - VCore 1.22 - VDroop Disabled - Startup CPU voltage - 1.588v
That is a significant voltage spike for our CPUs. Thanks for posting about this.
CaseLabs M-S8 - ASRock X99 Pro - Intel 5960x 4.2 GHz - XSPC CPU WC - EVGA 980 Ti Hybrid SLI - Samsung 950 512GB - EVGA 1600w TitaniumAffiliate Code: OZJ-0TQ-41NJ
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bdary
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 07:58:10
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I re-did a few of my OC profiles to now use Vdroop at 80% because of this high vcore spiking I've been seeing. I actually found that by using 80% setting and adding 20mV to vcore, I'm just as stable with less core temps and no vcore voltage spiking. The 1st pic is with Vdroop disabled using 1.335v vcore.  This pic below is with Vdroop enabled at 80% using 1.355v vcore. Notice the difference in core temps. And no voltage spikes. Also, while in UEFI/BIOS, I'll see a huge difference now in vcore being reported between vdroop disabled vs not. 
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d.burnette
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 10:17:19
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Whoa nice catch there nachtfalke00.
Glad to see some of this stuff getting found and hopefully resolved before I start putting my components together here in the next month or two. That one is pretty serious.
Don EVGA Z390 Dark MB | i9 9900k CPU @ 5.2 GHz all cores | EVGA RTX 3090 FTW3 Ultra | 32 GB G Skill Trident Z 3200 MHz CL14 DDR4 Ram | Corsair H150i Pro Cooler | EVGA T2 Titanium 1000w Power Supply | Samsung 970 Pro 1TB m.2 Nvme | Samsung 970 Evo 1TB m.2 Nvme | Samsung 860 Evo 1TB SATA SSD | EVGA DG 87 Case |
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KenMcC
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 11:34:24
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Hope this is reviewed by Jacob and / or other engineers. You say this does not happen with BIOS before 2.04. I find it strange that BIOS would have anything to do with startup voltage. It must be, as suggested, Vdroop, setting??
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 11:46:50
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i tried all Vdroop settings: disabled , intel specs , 60% , 80% ...make no diference ..the voltage spikes persist ...only with bios v2.04 and 2.05 ....with 1.14 /2.02 this issue don´t exist anymore BIOS 2.04 Updates: - Significant overclocking improvement when using Ivy Bridge-E processors
- Update product name to proper part number
- Fix PE4 LEd blinking
- Update MCU to 306
- Fix vcore error when voltage is below 1.535V ...i think this is problem
KenMcC
Hope this is reviewed by Jacob and / or other engineers. i already informed Jacob about this 2 day´s ago ..but no replay or any reaction
post edited by nachtfalke00 - 2013/10/01 11:51:59
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rebelderock
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 11:51:40
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JACOB WE URGE A FIX! WE ARE NOT GOING TO BURN OUR CPUS FOR BUGS LIKE THIS!
Coming soon: Intel core i7 4930k, EVGA X79 Dark, 2X EVGA Gtx Titan Sli + ACX Cooler and backplate
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bdary
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 12:18:40
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nachtfalke00
i tried all Vdroop settings: disabled , intel specs , 60% , 80% ...make no diference ..the voltage spikes persist ...only with bios v2.04 and 2.05 ....with 1.14 /2.02 this issue don´t exist anymore
BIOS 2.04 Updates:
- Significant overclocking improvement when using Ivy Bridge-E processors
- Update product name to proper part number
- Fix PE4 LEd blinking
- Update MCU to 306
- Fix vcore error when voltage is below 1.535V ...i think this is problem
KenMcC
Hope this is reviewed by Jacob and / or other engineers.
i already informed Jacob about this 2 day´s ago ..but no replay or any reaction
Yeah, without using a DMM or similar, you wouldn't know the extent of the spiking. I just found that with Vdroop disabled and sitting in the BIOS, the vcore was always so much higher than what was set. I realize it's showing a full load vcore, but being set at 1.36v and sitting at 1.422v was just too high for my liking. Then while stress testing, the vcore will fluctuate even higher than that here & there.
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bwanaaa
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 12:45:44
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is there any info on what the voltage readout pins are? Which is the ground, the 5v the 12, the vcore, etc?
EVGA Dark Intel i7 4930k EVGA GTC 780 SC ACX Corsair cmd32gx3m4a 1866 c9 1.6v 32g Samsung 256 840pro WD Black 2 gig LG Bluray Seasonic Platinum 1000 Corsair H110 Nanoxia DS-1 BIOS 2.07 Win7Pro 4.6 ghz @ 1.36v PLL on vDroop off Pics: http://forums.evga.com/tm.aspx?m=2031177#2031177
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 13:07:56
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KenMcC
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 15:16:25
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I think he is talking about the test pins on the motherboard. 
KenMcC Z170 Classy K; i7-6700 CPU, Corsair CMK16GX4M2A2400C14 Seasonic SSR-360GP 360W; Samsung 950 Pro M.2 256 GB Samsung 850 Evo 500 GB SATA Samsung 850 Evo 256 GB SATA Samsung SSD 840 Series 250 GB SATA Samsung 860 EVO 1 TB SATA Windows 10 x64 Prof.
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/01 21:35:04
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KenMcC
I think he is talking about the test pins on the motherboard.
i posted the probe cable for EZ Voltage Read Points from Left to Right are: VSA / PLL / GND / DIMM Right / GND / VCCIO / GND / DIMM Left / GND / CPU vcore for +3,3v, +5v , +12v ..can simply check from the 24pin ATX connectors if you want measured the VDroop from the +12v LINE ..check the voltage directly from the cpu power cable or vga power cable ..and you will see the droop and voltage difference of your PSU rail between idle -load
post edited by nachtfalke00 - 2013/10/01 21:59:56
Attached Image(s) 
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bwanaaa
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/02 07:50:29
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nachtfalke00
 
thank you very much. I think I see two tabs on the white plug-just trying to make sure I dont have the orientation flipped backwards in my head. Also, how do I do this: "If you want measured the VDroop from the +12v LINE ..check the voltage directly from the cpu power cable or vga power cable ..and you will see the droop and voltage difference of your PSU rail between idle -load " The power cable is plugged into the board-do i have to cut and splice a yellow (12v) wire? or a blue wire? or can I just plug in another cable to my power supply (seasonic 1000w platinum) and measure across the yellow and black on that?
EVGA Dark Intel i7 4930k EVGA GTC 780 SC ACX Corsair cmd32gx3m4a 1866 c9 1.6v 32g Samsung 256 840pro WD Black 2 gig LG Bluray Seasonic Platinum 1000 Corsair H110 Nanoxia DS-1 BIOS 2.07 Win7Pro 4.6 ghz @ 1.36v PLL on vDroop off Pics: http://forums.evga.com/tm.aspx?m=2031177#2031177
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/02 08:44:46
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don´t cut anything, just plugged DMM cable probe on the power cord atx, cpu, vga like in pic below for exemple 
post edited by nachtfalke00 - 2013/10/02 08:53:17
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KenMcC
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/02 11:38:48
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IMO, I would think the test points on the Motherboard would allow access to the same voltage points much eaiser.
KenMcC Z170 Classy K; i7-6700 CPU, Corsair CMK16GX4M2A2400C14 Seasonic SSR-360GP 360W; Samsung 950 Pro M.2 256 GB Samsung 850 Evo 500 GB SATA Samsung 850 Evo 256 GB SATA Samsung SSD 840 Series 250 GB SATA Samsung 860 EVO 1 TB SATA Windows 10 x64 Prof.
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rebelderock
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 03:52:34
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Coming soon: Intel core i7 4930k, EVGA X79 Dark, 2X EVGA Gtx Titan Sli + ACX Cooler and backplate
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bcavnaugh
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 06:23:16
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This "voltage spike" may have been what Killed my 3970X a few weeks back so do be aware of this when you OC the Dark. (v2.05)
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rebelderock
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 07:12:33
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This bug is very DANGEROUS. What do you think about it, EVGA? Time to fix it or not? Edit: Somebody claims that this is actually a feature and not a bug. May we have an official talk about it?
post edited by rebelderock - 2013/10/03 13:18:56
Coming soon: Intel core i7 4930k, EVGA X79 Dark, 2X EVGA Gtx Titan Sli + ACX Cooler and backplate
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bcavnaugh
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 21:19:49
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rebelderock
This bug is very DANGEROUS. What do you think about it, EVGA? Time to fix it or not?
Edit: Somebody claims that this is actually a feature and not a bug. May we have an official talk about it?
I would rather work with EVGA as it is a New Motherboard and we ARE part of the Team that Will make it one of the Best X79 Motherboards on the market. And please to not call me an FB, I would like to think that EVGA and the Members on this Forum as Parters.
post edited by bcavnaugh - 2013/10/03 21:22:24
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Afterburner
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 21:34:34
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linuxrouter
I have been able to reproduce this on my system using a meter with one of two configurations I tested so far.
BIOS 2.04
39x103 - VCore 1.00 - VDroop Disabled - Startup CPU voltage - 1.011v
44x103 - VCore 1.22 - VDroop Disabled - Startup CPU voltage - 1.588v
That is a significant voltage spike for our CPUs. Thanks for posting about this.
This is very similar to what I experienced...
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manojks
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/03 21:40:51
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Is it caused by the Bclk / Multi over 40 / something else. Sounds serious to kill a 3970x, i'm on 3960x but i haven't got a spike that high yet. *touch wood*
EVGA X79 DARK | Intel i7-3960X | EVGA TITAN SC | EVGA NEX 750W Gold | Crucial Ballistix Elite 16GB | Pioneer BDR-206M | Pioneer DVR-217J | Audioengine DAC-D1 & AE5+ | Crucial M500 480GB
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rebelderock
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 01:29:28
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Jacob claims that this is a feature.
"It has to do with an optimization for the VRM circuitry. (Increasing overclockability) We are not aware of any issues with this."
Coming soon: Intel core i7 4930k, EVGA X79 Dark, 2X EVGA Gtx Titan Sli + ACX Cooler and backplate
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cisco0623
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 06:27:11
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The real question is does this damage the CPU, wether it be instantaneous or over time.
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bcavnaugh
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 07:11:35
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cisco0623
The real question is does this damage the CPU, wether it be instantaneous or over time.
My thought on this is if you are going to Overclock or OC Failure is 1% Hardware 99% End User, and I take 99% of the blame for my CPU Failure and 1% Hardware whether Intel or EVGA I am the one that changed the setting Bios from Default or from the Optimized Setting for the Bios. But then this is why we have warranties and extended warranties on our Hardware.
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cisco0623
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 08:00:57
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bcavnaugh
cisco0623
The real question is does this damage the CPU, wether it be instantaneous or over time.
My thought on this is if you are going to Overclock or OC Failure is 1% Hardware 99% End User, and I take 99% of the blame for my CPU Failure and 1% Hardware whether Intel or EVGA I am the one that changed the setting Bios from Default or from the Optimized Setting for the Bios. But then this is why we have warranties and extended warranties on our Hardware.
I agree. If EVGA ever really "legally" responded to this I am sure it would be that overclocking is at your own risk. However the reality is you buy an evga dark to do exactly that, overclock. Hence their cryptic response.. That being said the response sounds like its nothing to worry about enjoy your setup and if something did go wrong I'm sure they would help. Intel would be another story! Myself personally am not to concerned, but it is interesting and I understand members concerns. Do other x79boards exhibit this same behavior or is it just the Darks VRM? If that be the case you know users will argue its a defect and a liability.
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 10:29:47
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cisco0623
Myself personally am not to concerned, but it is interesting and I understand members concerns. Do other x79boards exhibit this same behavior or is it just the Darks VRM? If that be the case you know users will argue its a defect and a liability.
i have here Asus Rampage IV Extreme ,Rampage IV Formula and Msi X79A GD65...none of these have this amazing feature aka "boot voltage spikes" like the Dark!!...and can not compare asus with evga ..because the ram overclocking and bclk is incredible so far by asus ...very stable voltages / good calibrated ...very good bios support a pleasure overclocking and benching with asus board
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linuxrouter
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 11:09:36
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I tested my Rampage IV Formula the other day and its VCore does not spike up like this on bootup. I tested with higher multipler, bclk, and VCore. The power on CPU voltage was stable and consistent.
I sent a PM to Jacob and he responded saying that this is a VRM optimization that was implemented via some Z87 boards and added to the Dark via BIOS 2.04. I do not have any Z87 boards to test with to confirm that. It would be nice to see a white paper explaining this VRM optimization that results in momentary high CPU voltage on startup.
CaseLabs M-S8 - ASRock X99 Pro - Intel 5960x 4.2 GHz - XSPC CPU WC - EVGA 980 Ti Hybrid SLI - Samsung 950 512GB - EVGA 1600w TitaniumAffiliate Code: OZJ-0TQ-41NJ
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nachtfalke00
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 11:36:13
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linuxrouter
I tested my Rampage IV Formula the other day and its VCore does not spike up like this on bootup. I tested with higher multipler, bclk, and VCore. The power on CPU voltage was stable and consistent.
I sent a PM to Jacob and he responded saying that this is a VRM optimization that was implemented via some Z87 boards and added to the Dark via BIOS 2.04. I do not have any Z87 boards to test with to confirm that. It would be nice to see a white paper explaining this VRM optimization that results in momentary high CPU voltage on startup.
i have here also Maximus VI Extreme Z87 , IMPACT Z87 , asrock Z87 OC formula and gigabyte Z87 OCF... NONE has this spikes ..NONE...this is not NORMAL to have ... evga board is UNFINISHED... also i have and cuple Z77 boards here( ofcourse is not evga) ...because this is my hobby overclocking ...none of them has this ISSUE/BUG ...
post edited by nachtfalke00 - 2013/10/04 11:55:07
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MiRai
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 11:47:33
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Thank you for bringing this into the light. If EVGA had mentioned this on the side of the box as a feature/optimization I would have not purchased the board. I guess it's back to BIOS 2.02.
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burningrave101
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Re: EVGA X79 Dark _cpu voltage spike issue with bios v2.05/v2.04
2013/10/04 12:01:54
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Are we positive the CPU itself is receiving the higher voltage at POST and not just the board/VRM?
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