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6700k set fixed vcore of 1.28 but prime raises it to 1.344?

post #1 of 9
Thread Starter 
I set a fixed vcore voltage of 1.28. Checking cpuz it shows 1.28 but as soon as I start up prime95 26.6, it shoots up to 1.344. My temps are under 70c on full load but am I setting the vcore wrong in the UEFI? Why is it not staying at 1.28? I have a ASRock Extreme4 Z170 board with the latest bios. Am I doing this wrong? How do I properly set vcore to stay at the voltage I want?
post #2 of 9
If you are using an adaptive or dynamic vcore, there is an AVX offset and vcore will climb to account for the extra demand.
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5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
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X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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CPUMotherboardGraphicsRAM
5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
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Plextor M6e 128GB (fw 1.06) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Noctua NH-D15 
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Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
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X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
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ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
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post #3 of 9
Thread Starter 
I'm not. I am using fixed vcore. Wonder what the heck is up with that? Asrock motherboard. Latest bios. Wonder if it's a bug.
post #4 of 9
post #5 of 9
Thread Starter 
LLC is at 1. Should I set it to AUTO? There is nothing lower than 1 on my board.
post #6 of 9
Quote:
Originally Posted by jarablue View Post

LLC is at 1. Should I set it to AUTO? There is nothing lower than 1 on my board.

Is LLC the highest or lowest amount of vdroop on your board?
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CPUMotherboardGraphicsRAM
5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
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Plextor M6e 128GB (fw 1.06) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Noctua NH-D15 
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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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1x Crucial BLT4G3D1608ET3LX0 @ 2000, 10-11-11-3... OCZ (Toshiba) Trion 150 120GB Hyundai Sapphire 120GB 3x Hitachi Deskstar 7k1000.C 1TB 
CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
Intel 600p 256GB NVMe 2x HGST Travelstar 7k1000 1TB Corsair H55 (temporary) Windows Server 2016 Datacenter 
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Seasonic SS-860XP2 Corsair Carbide Air 540 
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Secondary
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In progress
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CPUMotherboardGraphicsRAM
5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.06) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
RAMHard DriveHard DriveHard Drive
1x Crucial BLT4G3D1608ET3LX0 @ 2000, 10-11-11-3... OCZ (Toshiba) Trion 150 120GB Hyundai Sapphire 120GB 3x Hitachi Deskstar 7k1000.C 1TB 
CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
Intel 600p 256GB NVMe 2x HGST Travelstar 7k1000 1TB Corsair H55 (temporary) Windows Server 2016 Datacenter 
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Seasonic SS-860XP2 Corsair Carbide Air 540 
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post #7 of 9
Thread Starter 
Have no idea but I found this post on asrocks forums about a board very similar to mine...

"""Hi All,

I'm curious if anyone else can confirm two strange behaviors I'm seeing on my z170 pro4 running bios 3.20. The first is the behavior of LLC levels, and the second is Offset mode not producing normal voltages at 0mV offset.

LLC: According to the graphic in the bios, it appears that LLC Level1 should provide the least voltage drop (highest Vcore under load) of the 3 settings available. I find exactly the opposite. I have the highest voltage difference between VID and Vcore at Level1, slightly less difference (i.e. higher Vcore) at Level2, and then the highest Vcore at level3 which is also the lowest gap between VID and Vcore. This is running at 4.5GHz i7-6700k using Auto voltage mode.

Am I completely confused or is this backwards from what is shown in the bios image about the behavior of LLC levels? Shouldn't level3 allow the most voltage drop at high load? Why is level1 allowing the most voltage drop at Vcore under load?


Second question is regarding Offset mode for overclocking providing a much lower voltage than expected at 0mV offset. I've got my system running stable at 4.5GHz using Auto mode and LLC Level1. I wanted to experiment with Offset mode to further lower the voltage and still be stable at 4.5GHz. I started by changing just 1 thing, Auto mode to Offset mode, and leaving the offset voltage field at Auto (which is between 5mv and -5mv) and thus I interpret at 0mV offset.

I was expecting my system to produce the same VID and Vcore under load as it did in Auto mode, but I find that Offset mode is producing a VID 130mV lower than it was under the same load in Auto mode. My VID in this mode is only at 1.19V under load where it was previously 1.320V using Auto mode. My system soon froze after getting these readings.

Am I completely confused or is this strange behavior for Offset mode considering I'm using no offset voltage? Any thoughts on what could be going on? As an aside, on the next boot after my freeze Windows7 OS became corrupt and would not boot, forcing a re-image.

Thanks!"""
post #8 of 9
Quote:
Originally Posted by jarablue View Post

LLC: According to the graphic in the bios, it appears that LLC Level1 should provide the least voltage drop (highest Vcore under load) of the 3 settings available

u are using level 1. use level 4 and check voltage under load. should give you some vdroop. if its too much try level 3. thumb.gif

post #9 of 9
Thread Starter 
That did it. Thanks. Checking vcore now at full load it's 1.296 at LLC level 3. I don't know why when selecting fixed vcore, it is not keeping it at 1.28. Why do I have to use llc with a fixed vcore, have no clue.

But I will test prime95 now and see if I can get down to level 4. Right now I am happy it's fixed. Thanks again for the help. smile.gif
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