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Voltage: MSI AB, GPU-Z and MSI Kombustor all report different numbers. Please help me understand.

post #1 of 7
Thread Starter 
Hello and thanks for reading.

My card: (new) Sapphire 7870 XT (Bios .30, driver AMD 13.5beta2).

First, MSI AB v3.0 Beta 10 reports the default voltage as 1.075, which is just plain wrong (I've been told that stock for this card is 1.188). Second, after much fiddling about where MSI AB refused to properly save my settings (doesn't seem to like it when you type in values versus using the slider), I end up saving and applying the following profile:

Core Voltage: 1213
Power Limit: +20%
Core Clock: 1201 (didn't like it when I typed in "1200"...wouldn't save)
Memory Clock: 1500 (stock value)

And it seems to load properly.

I then launch GPU-Z 0.7.2 and it reports the GPU clock at 1201. But when I look at the voltage, it's about 1.075 (funny, that's the (wrong) default MSI AB initially reported). But, it does fluctuate from 0.080 or so to 1.111...never close to the 1.213 that I set MSI AB to.

I run the Unique Heaven and MSI Kombustor Extreme benchmarks, and even with 99% GPU usage, the volts never approach the MSI AB value I set. Though, again oddly, MSI Kombustor reports my voltage as 1.256 — that's higher than the 1.213 setting I spec'd in MSI AB. Kombustor also reports my memory as 1361 rather than 1500. Huh?

No artifacts or issues, though, so perhaps I should leave well enough alone and be happy that the 1200 clock appears stable. And temps are good, staying in the 60s or low 70s with fan speeds between 40%-75%.

Still, I'm puzzled by the voltages. Why don't they agree across the applications? How do I know I'm getting what I spec'd in MSI AB?

Any feedback, thoughts and insights are most welcome.

Thanks,

ELB

MSI AB settings checked: hardware control and monitoring, low-level hardware access interface, unlock voltage control, restore settings after suspended mode, extend official overclocking limits, disable ULPS, unofficial overclocking mode = without PowerPlay support, reset display mode on applying unofficial overclocking.

System:
Motherboard: ASUS P8Z68-V
PSU: Corsair 620HX
CPU: Intel i5-2500k (OC'd to 4.33 GHz)
RAM: G.Skill Ripjaws X 8GB DDR3 1600
GPU: Sapphire Radeon HD 7870 XT 2GB
OS: Win 7 Home Premium
DirectX: DirectX 11

Edited by MrELB - 6/27/13 at 4:47pm
post #2 of 7
Have you enabled AMD Overdrive in CCC?
post #3 of 7
Thread Starter 
Quote:
Originally Posted by Poisoner View Post

Have you enabled AMD Overdrive in CCC?

Nope, but I just did.

Now, how will/should that affect what I've already done?
post #4 of 7
Quote:
Originally Posted by MrELB View Post

Nope, but I just did.

Now, how will/should that affect what I've already done?

I know it interferes with fan profiles in my experience.
post #5 of 7
Thread Starter 
Anyone have any further insight on why MSI AB, GPU-Z and Kombustor are inconsistent in their reports of voltages?
post #6 of 7
Just, forget it. They will never be 100% accurate. You need to use a Fluke (or other brands) to get the voltage correct.

Also, you can't change Vcore on that card with software thumbsdownsmileyanim.gif
Edited by Glends - 6/28/13 at 8:17am
post #7 of 7
Thread Starter 
Not the answer I was hoping for, but at least a straight answer, which is all I can ask.

For what it's worth, seems to be performing well at a 1200 OC (up from 975 stock), with perfectly acceptable-to-good temps (around 65-75C). So, I guess I won't worry about the voltages any longer.

Thanks.
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Overclock.net › Forums › Graphics Cards › AMD/ATI › Voltage: MSI AB, GPU-Z and MSI Kombustor all report different numbers. Please help me understand.