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Can I trust GPU-z's VDDC reading?

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I have two boost 7950's crossfired and their stock "boost" voltage is 1.25v. For the MSI TFIII, the voltage jumps around between 1.156, 1.164, 1.172, and 1.184. For the Sapphire Dual-x the voltage jumps around between 1.160, 1.172, 1.188, and 1.229. They never actually hit 1.25v. GPU-z reports the MVDDC to be 1.5v on the voltage unlocked TFIII, which is correct and 1.55v on the locked voltage Sapphire Dual-x. The correct memory voltages inclines me to believe these numbers to be semi-correct. The readings were taken a couple hours into Bitcoin Mining so the GPU's were both between 98%-99% load the whole time.
The MSI TFIII was running a clock speed of 1250/625 with 1.25v/1.5v (undervolted and underclocked memory to keep down heat)
The Sapphire Dual-x was running a clock speed of 1175/625 with 1.25v/1.55v (unable to change any of the voltages, underclocked memory)

So what do you guys think? I would be pretty impressed if my TFIII could actually run 1250Mhz on 1.184v biggrin.gif
post #2 of 2
Quote:
Originally Posted by RavageTheEarth View Post

I have two boost 7950's crossfired and their stock "boost" voltage is 1.25v. For the MSI TFIII, the voltage jumps around between 1.156, 1.164, 1.172, and 1.184. For the Sapphire Dual-x the voltage jumps around between 1.160, 1.172, 1.188, and 1.229. They never actually hit 1.25v. GPU-z reports the MVDDC to be 1.5v on the voltage unlocked TFIII, which is correct and 1.55v on the locked voltage Sapphire Dual-x. The correct memory voltages inclines me to believe these numbers to be semi-correct. The readings were taken a couple hours into Bitcoin Mining so the GPU's were both between 98%-99% load the whole time.
The MSI TFIII was running a clock speed of 1250/625 with 1.25v/1.5v (undervolted and underclocked memory to keep down heat)
The Sapphire Dual-x was running a clock speed of 1175/625 with 1.25v/1.55v (unable to change any of the voltages, underclocked memory)

So what do you guys think? I would be pretty impressed if my TFIII could actually run 1250Mhz on 1.184v biggrin.gif

I use GPU-Z along with MSI Afterburner (monitor window) to show any reported data for double confirmation.
Example, sometimes my underclocking doesn't really show on GPU-Z but it does on MSI Afterburner.
 
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The Monolith
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Western Digital Scorpio Black Stock Stock Windows 7 
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FHD (1920 x 1080) Thinkpad Keyboard 170W Carbon-Fiber/Glass Fiber reinforced Plastic 
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Intel® Core™ i7-3770K Gigabyte GA-Z77X-UP7 XFX Radeon 6990 4GB XFX Radeon 6990 4GB 
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XFX Radeon 6990 4GB XFX Radeon 6990 4GB Kingston HyperX 16GB (2 x 8GB) 1600Mhz Kingston SSDNow 240GB 
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