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What are those settings in BIOS?

post #1 of 11
Thread Starter 
First time Haswell owner wheee.gif

I'm looking to undervolt my CPU and RAM. CPU is Celeron G1820.
I'm a bit lost at all those settings.



I think I'll be lowering the Vcore via the additional offset setting, it allows negative values.
Do I need to care about the other things? What are they? Everything is at Auto for now.
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post #2 of 11
You can leave them all at auto, sometimes they need to be turned up for CPU/RAM overclocking. Underclocking is fine.
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post #3 of 11
Thread Starter 
I actually managed to get the core voltage down to 0.779, half an hour of IBT and half hour Diablo 3, no crashes yet.
Also RAM down to 1.3 from 1.5v
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post #4 of 11
Quote:
Originally Posted by ronnin426850 View Post

I actually managed to get the core voltage down to 0.779, half an hour of IBT and half hour Diablo 3, no crashes yet.

That is almost certainly not load vcore.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by Blameless View Post

That is almost certainly not load vcore.

CPUz and HWMon show that while stress testing with IBT. Should I use another program?
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post #6 of 11
Quote:
Originally Posted by ronnin426850 View Post

CPUz and HWMon show that while stress testing with IBT. Should I use another program?

They should be showing more or less accurate voltage.

What clock speed are you running?
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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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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
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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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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Blameless View Post

They should be showing more or less accurate voltage.

What clock speed are you running?

2.7Ghz, stock. Locked multi.
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My Rig
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Ex-wife's Rig
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CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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post #8 of 11
Quote:
Originally Posted by ronnin426850 View Post

2.7Ghz, stock. Locked multi.

Yeah, I didn't realize your part was clocked so low, relatively speaking. Stable at 0.78 vcore seems plausible for that part.

You might be able to get away with small negative offsets on the other voltages (though SA and IO voltages probably have a very small negative range, and won't help as much as cache), as well as reduced VRM frequency. VR Efficiency Mode can probably be set to near the lowest power setting without issue.

Input voltage can probably be turned down to about 1.6-1.7v.
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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 
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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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 
PowerCase
Seasonic SS-860XP2 Corsair Carbide Air 540 
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by Blameless View Post

Yeah, I didn't realize your part was clocked so low, relatively speaking. Stable at 0.78 vcore seems plausible for that part.

You might be able to get away with small negative offsets on the other voltages (though SA and IO voltages probably have a very small negative range, and won't help as much as cache), as well as reduced VRM frequency. VR Efficiency Mode can probably be set to near the lowest power setting without issue.

Input voltage can probably be turned down to about 1.6-1.7v.

What are those actually, I come from AMD land, and we didn't have those biggrin.gif System Agent?!
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post #10 of 11
Ring/cache is for interconnect (a ring bus) that glues all the various parts/clock domains of the CPU together and the L3 cache.

SA is system agent, which is the bulk of the uncore, which is pretty much everything on the chip that isn't the cores, ring/cache, or IGP. Things like the memory controller and PCI-E/DMI controllers, plus any miscelaneous I/O.

FIVR is full integrated voltage regulator. Haswell and Broadwell do most of their voltage regulation with an on-die FIVR that steps down vINPUT to all the other voltages the CPU uses, except for one of the I/O voltages. VRM frequency and loadline calibration only apply to input voltage, not anything else.

Some illustrations:

slide39.jpg

apcnews2012intel_haswell_change_overview_thumb_mainImage1.jpg1.jpg
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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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