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Gigabyte P67A-UD5-B3 Voltage Discrepencies!!!

post #1 of 6
Thread Starter 
Hi Overclock.net!

I have a P67A-UD5-B3 board that I'm using with a i5-2500k. I have managed to overclock it to 4.2Ghz stable with the voltage set in BIOS F5 to 1.345v Thing is in the BIOS screen the voltage reads 1.308 (1.260 load) and same in CPUZ on the desktop. Also I can't seem to read the fan speeds properly on HWMonitor. I also read more voltage for RAM than what is set in the BIOS. Kinda scary when manual settings aren't reflected in desktop HW monitor software AND in the BIOS it's "PC Health Status"!!!

What ever setting in the BIOS you have for RAM voltage it's +0.02 HIGHER with monitoring software.
What ever setting in the BIOS you have for CPU voltage it's -0.05 LOWER with monitoring software. This is significant no!!!

This also includes the PC health status monitoring screens in the BIOS.

I'm using BIOS F5.
Edited by HiroPro - 8/14/11 at 12:53am
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Hal9000
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i5 2500K @ 4.2Ghz 1.325v in BIOS but 1.278 DMM Gigabyte P67A-UD5-B3 BIOS F5 HD 4890 Mushkin Blackline 996744 PC3-12800 8-8-8-24@1.58v 
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post #2 of 6
it's called vdroop (voltage drop) and volt bump... there's nothing to worry if it's less than 0.05v, it's very common.

edit: btw, fill in your system specs so people can understand what your talking about here: http://www.overclock.net/usercp.php then look to your left down, look for "add system"
    
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by robwadeson View Post
it's called vdroop (voltage drop) and volt bump... there's nothing to worry if it's less than 0.05v, it's very common.

edit: btw, fill in your system specs so people can understand what your talking about here: http://www.overclock.net/usercp.php then look to your left down, look for "add system"
Dude this isn't when the CPU is under LOAD... It's when it's totally idle... and I disabled EVERY C1E/speedstep BS in the BIOS so I have no dynamic clock or voltage due to power management.

vdroop is when the CPU is under LOAD Did you not read what I posted?

If I set the BIOS to a certain voltage then I reboot and enter BIOS again in "PC Health Status" and it's showing the WRONG voltage with a difference of 0.05 it's significant! It looks like Gigabyte coded the BIOS to have an offset of -0.05v for CPU voltage compared to what the user sets.

This was probably on purpose to prevent the JeffKs from blowing up their processors but to an old veteran like me it's a pissoff and now I don't trust the settings in the BIOS until I break out my DMM.
Edited by HiroPro - 8/14/11 at 12:55am
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Hal9000
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i5 2500K @ 4.2Ghz 1.325v in BIOS but 1.278 DMM Gigabyte P67A-UD5-B3 BIOS F5 HD 4890 Mushkin Blackline 996744 PC3-12800 8-8-8-24@1.58v 
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WD Caviar Black 1TB SH-203N Win 7 Ultimate X64 and Linux Mint LG 24" 16:10 
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post #4 of 6
there is vdrop and vdroop. vdrop is the drop in voltage from what you set in BIOS to what you get in reality, it applies to every voltage output the motherboard provides but in different amounts. Vdroop is the drop of voltage under load to account for transient overshoot that occurs when you go back to idle state abruptly and to keep your processor within thermal/power spec.

Why don't you pull out a digital multimeter and measure your voltages in reality?

I also bet that if you just didn't set a voltage at all and left it on auto, it would give you a lower voltage through SVID than 1.345v set in BIOS for 4.2ghz.

On your board you have a load line calibration setting, why not trying using it? it will adjust vdrop and vdroop.

You should have three levels, disable, level1, and level2. Depending on what BIOS you are on. If you have the latest BIOS you might even have 10 levels, but those original 3 are better.

The higher the level the lower the vdroop theoretically, but on some board GB messed up the LLC, and they are almost all the same, or they all are too strong. You have to test.

Now the difference between reading the voltage for real(DMM) and reading with software is that while the differences from idle to load are pretty much on the same range, the actual voltage aren't.
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post #5 of 6
Thread Starter 
Thanks Sin0822 as I was just looking for reassurance this is normal vdrop and vdroop as I've just moved back to Intel from an almost ten year AMD fanboy run. 2500k and 2600k was just to tempting and such AMD eaters I couldn't pass Sandy Bridge up this time around!

Quote:
I also bet that if you just didn't set a voltage at all and left it on auto, it would give you a lower voltage through SVID than 1.345v set in BIOS for 4.2ghz.
Yeah it does and it comes in at 1.320 ish or lower and is unstable... I ran into some prime95 core failure at 1.345 so I have now set it to 1.35 and it's vdrop is around 0.04 and vdroop is 0.048

I ran prime95 all night with LOTRs 1080p playing back in DXVA mode so I stressed CPU whilst HD access and video card was being used. Ran twelve hours with no errors and I'm happy at 4.2Ghz as I want this board and chip to LAST!
Edited by HiroPro - 8/13/11 at 3:43pm
Hal9000
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500K @ 4.2Ghz 1.325v in BIOS but 1.278 DMM Gigabyte P67A-UD5-B3 BIOS F5 HD 4890 Mushkin Blackline 996744 PC3-12800 8-8-8-24@1.58v 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 1TB SH-203N Win 7 Ultimate X64 and Linux Mint LG 24" 16:10 
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Corsair HX650 Lian Li PC-8FI 
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Hal9000
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CPUMotherboardGraphicsRAM
i5 2500K @ 4.2Ghz 1.325v in BIOS but 1.278 DMM Gigabyte P67A-UD5-B3 BIOS F5 HD 4890 Mushkin Blackline 996744 PC3-12800 8-8-8-24@1.58v 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 1TB SH-203N Win 7 Ultimate X64 and Linux Mint LG 24" 16:10 
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Corsair HX650 Lian Li PC-8FI 
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post #6 of 6
yea that is still within the safe limits of vcore for SB.

AMD spec didn't really demand a vdroop, but with bulldozer that will change, as its part of AMD's new spec.

anyways good luck, and try to use LLC if you are upset about the vdroop.
X99 Main Rig
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CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
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X99 Main Rig
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CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
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