Originally Posted by fornowagain
Any idea what going on here then?
I know for sure is the vcore measured from the back of the card never exceeds 1.35v volts no matter what value I use. This is a trace from 'in game' loads compared to resting loads at different voltages. It doesn't pull any more current in 3d 1.52v than 3d 1.35v. And were it moves to 1.52v in resting mode the current is well under even the 1.26v stock load current. So no evidence OCP. And OVP should always be above the set VID.
1.06v (2d register) to 1.55v gives ~1.35v. Upto 1.35v its very close to the DMM values in 0.0125v steps. But something is limiting it, voltage increase is linear till it hits the wall.
OK, now, besides the fact that I don't really understand why you would really want to run your card at 1.55V, here's what I'm thinking.
You are simply hitting the power circuits physical limits.If the monitored data is correct, what you see is that the current actually decreases while the voltage is set to 1.55V, in comparison to 1.35V. And at the time the voltage falls back to 1.35V the current increases again.
It would seem as if the circuit just can't deliever any more current than what is available at 1.35V. That's why the current decreases when the voltage rises. You hit a point where the power output is limited to a certain amount. It's like Intel's VDroop function. Once the current draw gets too high, you either have to drop the voltage to deliever the current, or drop the current to get the voltage. Both won't happen, as it's a physical limit.
Perhaps this could be modified in some way, but I doubt that it would be very healthy for the card.
Oh and BTW, what is the actual DMM reading of the voltage, when VID is set to 1.55V? I didn't fully understand that just from reading your post. It's a bit confusing. But maybe that's just because English is not my native language. In one passage it reads like it was 1.35V and then you talk about 1.52V. What is the correct value?
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