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Strange voltage issue with Gigabyte 7950, any help would be appreciated !

post #1 of 3
Thread Starter 
I have a Gigabyte 7950 for 2 days now and i noticed something strange with the voltage. Whatever value i set for my voltage in Sapphire Trixx, the actual voltage i get from sensors in programs like GPU-Z or HWinfo64 is ~50 mV lower. For example, if i set my voltage to 1.2 and run Kombustor, the voltage i'm getting in GPU-Z is 1.149. If i set the voltage to 1.225, i'm getting ~1.175 in GPU-Z.

Also, on idle, GPU-Z is showing 0.8 V while the stock should be 1.087. If i run Kombustor on stock, the sensors show 1.047. The voltage sensor in Kombustor (top right) never changes from 1.09, no matter what the voltage in trixx is.

Does anyone have any idea what may cause this and which voltage i should trust ? Also, MSI Afterburner causes issues with my card so i can't use that for OC. Thanks !
post #2 of 3
Normal. This is called Vdroop or Vdrop.
Voltage drops in about every video card in the world, no matter what you do it is always going to drop during load. same thing happen with CPUs.

0.806mV is the low 2d voltage when you are at the desktop doing nothing, or the GPU is idleing doing nothing.
0.949mV happens when the GPU is loaded with Blu-ray, videos such as from Youtube videos, Google... etc or even when browsing sometimes
1.093mV happens when you game and will Vdrop during high loads which is normal.

The most accurate software to measure voltage is GPU-Z, it also can report your VRM temperatures.
Kombustor or Afterburner are not as accurate also they don't have the ability to measure VRM temperatures..

Also best software for overclocking for the red team is Sapphire Trixx from my experience. It allows more voltage control than AB also it doesn't mess the desktop like AB when the unofficial ocing is unlocked.
Edited by HeadlessKnight - 1/15/13 at 3:56am
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Desktop
(16 items)
 
Laptop
(10 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-5820K @ 4.40 GHz Asus Rampage V Extreme/U3.1 MSI GTX 980 Ti Gaming 6GB  Corsair Vengeance LPX 16GB (4x4) DDR4-3000 
Hard DriveHard DriveCoolingOS
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Asus VG236H 23" 120 Sony XBR43X800D 43" 4K TV CoolerMaster Octane Storm + Razer Turret EVGA SuperNOVA 1000 G3 
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Corsair Graphite 760T Black Logitech G502 Proteus Spectrum + Razer Turret Razer Goliathus Asus Xonar Essence STX II 
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Intel Core i7-4720HQ @ 2.60 GHz Asus G751JY Asus GTX 980M 4GB SK hynix HMT41GS6BFR8A-PB 16GB (2x8) DDR3L-1600 
Hard DriveHard DriveOptical DriveOS
SanDisk SD7SB3Q128G1002  HGST Travelstar 7K1000 1TB HL-DT-ST DVDRAM GUC0N Windows 10 Home 64-bit 
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LG Philips LP173WF4-SPD1 + G-SYNC @ 75 Hz Realtek ALC668 
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by HeadlessKnight View Post

Normal. This is called Vdroop or Vdrop.
Voltage drops in about every video card in the world, no matter what you do it is always going to drop during load. same thing happen with CPUs.

0.806mV is the low 2d voltage when you are at the desktop doing nothing, or the GPU is idleing doing nothing.
0.949mV happens when the GPU is loaded with Blu-ray, videos such as from Youtube videos, Google... etc or even when browsing sometimes
1.093mV happens when you game and will Vdrop during high loads which is normal.

The most accurate software to measure voltage is GPU-Z, it also can report your VRM temperatures.
Kombustor or Afterburner are not as accurate also they don't have the ability to measure VRM temperatures..

Also best software for overclocking for the red team is Sapphire Trixx from my experience. It allows more voltage control than AB also it doesn't mess the desktop like AB when the unofficial ocing is unlocked.

Thanks for the input. In my case tho, the voltage never goes above Trixx-50mV, i.e. if its 1.2 in trixx, it will never go above 1.15 in GPU-Z and is a constant 1.15 during Kombustor/Furmark testing. I have a feeling Trixx shows +50 mV of mu actual voltage. Is this eve npossible ?
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