Which is the real voltage reading?

summoning · 09-21-09, 04:09 PM

for example i changed cpu voltage to 1.30v in bios
after restart,bios shows 1.27v
in windows when cpu is idle it shows 1.25v and under load it shows 1.23.
when overclocking which is the one i should care?
1.30v or 1.23v?

Boulard83 · 09-21-09, 04:20 PM

Its the Vdrop/Vdroop that cause the drop between BIOS/IDLE/LOAD. Cause by the mobo parts and PSU. Some board have an option called LLC to neutralize the Vdroop. ( drop between idle and load ).

EarthDog · 09-21-09, 04:22 PM

Right boulard!

Difference in bios setting to actual idle voltage = Vdrop.
Difference in idle to load voltage = Vdroop controlled by some mobos with an option called LLC (like Boulard said).

I would trust w/e CPUz says if you dont have a DMM handy to confirm.

summoning · 09-21-09, 04:48 PM

yes i know vdrop and vdroop causing this.
but i'm not sure which one i should trust when overclocking...
which one is the real voltage that cpu is getting ..

and another silly question,
idle voltage is higher than load voltage so at idle does the cpu wear out faster than load ?

EarthDog · 09-21-09, 04:51 PM

Like I just said, I would trust CPUz's readings as its the only thing you have in windows really.

To answer your other question, simply no. The difference in voltages are so low you will have undoubtedly upgraded by the time it made a difference. Hell by the time .1v would make a difference you would have upgraded none the less .05 or so.

Boulard83 · 09-21-09, 07:10 PM

They are ALL "real" voltage ..... a board with bad Vdrop + vdroop will need more in the BIOS since he lost more from the parts + load.

With LLC enabled wiht my P5Q my load Vcore is = to what i set in BIOS. ( very similar )

jason4207 · 09-22-09, 01:53 PM

The voltage at idle may be higher, but the current is WAY lower.

09-21-09, 04:09 PM	Thread Starter #1
summoning Registered Join Date: Sep 2009	Which is the real voltage reading? for example i changed cpu voltage to 1.30v in bios after restart,bios shows 1.27v in windows when cpu is idle it shows 1.25v and under load it shows 1.23. when overclocking which is the one i should care? 1.30v or 1.23v?
	QUOTE Thanks

09-21-09, 04:20 PM	#2
Boulard83 Join Date: Jan 2009 Location: Quebec - Canada	Its the Vdrop/Vdroop that cause the drop between BIOS/IDLE/LOAD. Cause by the mobo parts and PSU. Some board have an option called LLC to neutralize the Vdroop. ( drop between idle and load ). __________________ • Le Québécois • • • • • BTTB / W7 pro • • • • EVGA X79 FTW • I7 3820 • PH-TC14PE • 16gb G.Skill 2133mhz • EVGA GTX 670 + Accelero TTII Tecnofront HWD BenchTable • Antec TPQ-1200-OC • 2x Agility 4 256gb • Surround Asus VE278Q 5760x1080 • • • • HTPC / W7 pro • • • • Asus Z77-m Pro • 2500K • NH-C12P • 2x4gb G.Skill Ares 1600mhz Asus GTX 650 TI • Agility 4 128gb • Enermax Naxn 550w • Lian Li PC-C60B • • • • Server / WHS 2011 • • • • Gigabyte H77m-D3H • G2020 • 2x4gb G.Skill 1600mhz • X25m 80gb 2x 1TB Black • 1x 2TB green • CX430M • Hauppage HVR-2250
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09-21-09, 04:22 PM	#3
EarthDog Senior PITA Member Overclockers.com Editor Join Date: Dec 2008 Location: Stuck in Maryland...	Right boulard! Difference in bios setting to actual idle voltage = Vdrop. Difference in idle to load voltage = Vdroop controlled by some mobos with an option called LLC (like Boulard said). I would trust w/e CPUz says if you dont have a DMM handy to confirm. __________________ Should I R0 my SSD? / SandyBridge / Ivybridge Overclocking Guide / AMD Overclocking Guide / Power Supply Guide SSD Reliability/Write Endurance / JOIN THE BENCHING TEAM! / Bulldozer Overclocking Guide / Forum Etiquette Want to see your writing featured on the overclockers.com Front Page? PM me, I can help! "We have more information and more ways of accessing it than ever, yet seem increasingly less inclined to do so."- Michael Wilbon
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09-21-09, 04:48 PM	Thread Starter #4
summoning Registered Join Date: Sep 2009	yes i know vdrop and vdroop causing this. but i'm not sure which one i should trust when overclocking... which one is the real voltage that cpu is getting .. and another silly question, idle voltage is higher than load voltage so at idle does the cpu wear out faster than load ?
	QUOTE Thanks

09-21-09, 04:51 PM	#5
EarthDog Senior PITA Member Overclockers.com Editor Join Date: Dec 2008 Location: Stuck in Maryland...	Like I just said, I would trust CPUz's readings as its the only thing you have in windows really. To answer your other question, simply no. The difference in voltages are so low you will have undoubtedly upgraded by the time it made a difference. Hell by the time .1v would make a difference you would have upgraded none the less .05 or so. __________________ Should I R0 my SSD? / SandyBridge / Ivybridge Overclocking Guide / AMD Overclocking Guide / Power Supply Guide SSD Reliability/Write Endurance / JOIN THE BENCHING TEAM! / Bulldozer Overclocking Guide / Forum Etiquette Want to see your writing featured on the overclockers.com Front Page? PM me, I can help! "We have more information and more ways of accessing it than ever, yet seem increasingly less inclined to do so."- Michael Wilbon
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Which is the real voltage reading?

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09-21-09, 07:10 PM	#6
Boulard83 Join Date: Jan 2009 Location: Quebec - Canada	They are ALL "real" voltage ..... a board with bad Vdrop + vdroop will need more in the BIOS since he lost more from the parts + load. With LLC enabled wiht my P5Q my load Vcore is = to what i set in BIOS. ( very similar ) __________________ • Le Québécois • • • • • BTTB / W7 pro • • • • EVGA X79 FTW • I7 3820 • PH-TC14PE • 16gb G.Skill 2133mhz • EVGA GTX 670 + Accelero TTII Tecnofront HWD BenchTable • Antec TPQ-1200-OC • 2x Agility 4 256gb • Surround Asus VE278Q 5760x1080 • • • • HTPC / W7 pro • • • • Asus Z77-m Pro • 2500K • NH-C12P • 2x4gb G.Skill Ares 1600mhz Asus GTX 650 TI • Agility 4 128gb • Enermax Naxn 550w • Lian Li PC-C60B • • • • Server / WHS 2011 • • • • Gigabyte H77m-D3H • G2020 • 2x4gb G.Skill 1600mhz • X25m 80gb 2x 1TB Black • 1x 2TB green • CX430M • Hauppage HVR-2250
	QUOTE Thanks

09-22-09, 01:53 PM	#7
jason4207 Senior Member Join Date: Nov 2005 Location: Concord, NC	The voltage at idle may be higher, but the current is WAY lower. __________________ MAIN RIG: 3570K @ 4.5GHz 1.272v H100i Extreme4-Z77 8GB-G.Skill @ 2200MHz 9-11-11-28 1.60v CM_430-Elite GTX670_DCuII_TOP @ 1358/7244 1.212v Xplosion-DTS 256GB-Samsung_830 1TB-Black Seasonic_X-750 27.5"-1200P-LCD Z5500-5.1 \|\| PLV-Z4_720P_Projector_95" Paradigm_6.1_DTS-ES G9_Mouse Logitech_Illuminated_KB Logitech_G27_Wheel+Microsim_Racing_Pod *HEAT* GAMING HTPC: i3-550 @ 4.5GHz 1.35v H70 MSI_H55M-ED55 4GB-G.Skill @ 1875MHz 7-9-7-23 1T GTS450 @ 970/1940/2100 240GB_Sandisk_Extreme 640GB_Blue Corsair_CX430 Panny 42S2 1080P Plasma unRAID FILE SERVER: E5200-M0 @ 2GHz 0.856v MSIP43Neo3-F 4GB-Corsair @ 800MHz CM590 Antec550W 19TB-Parity_Protected_Storage / 1TB-Cache / 2TB-Parity / 10x2TB 2x1TB
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