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Wonky 1080 FE Behavior - Has anyone else seen this?

post #1 of 3
Thread Starter 
Hello All,

I just scored an awesome deal on an open box EVGA 1080 Founders Edition, but it's exhibiting some strange behavior. Specifically, the core clock and voltage are all over the place under even a light load. Running Unigine Heaven 4, the core clock ramps quickly up to 1860 (no overclock applied), then bounces around in the 1700s and 1800s while the voltage bounces from .99 to 1.02. By "bouncing" I mean the clock and voltage don't stay the same from one second to the next, and this results in very visible jerks and hitches in the render.

And after about 1 minute of Heaven, when the voltage approaches 1.02 and temps hit about 76, my system reboots. Every time :-P.

So some background; This is all under a clean install of 368.81, Win10 64, initially with no OC tools installed. At first, I thought the previous owner might have flashed the bios (even though what GPU-Z reports looks like stock), so I flashed back to the EVGA 1080 FE stock bios just to be sure, but no change.

So here's where it gets funny. I installed Precision XOC and tried underclocking. -100 core, -100 memory, 95% power target. This resolves the problem. So I tried leaving stock clocks and just upping the power target to 110%. This ALSO solves the problem. It seems like a power throttling issue, and giving it a little more room is all it needs. But that seems strange for stock, right?

Sorry for the long post, just wanted to be thorough :-D At any rate, I'm really on the fence about whether or not to keep the card. I don't mind running XOC, I'm more worried about resale in the future. I can't in good conscience resell a card I think has a flaw. So I'm wondering if it actually does have a flaw.. thoughts?
post #2 of 3
Thread Starter 
Quick update; I used the XOC scanner at small, 5mhz intervals, to set the voltage curve. The results are a dramatic improvement!!! Looping Heaven for a bit, the voltage quickly locks into 1.025 and stays locked in! Also, I was seeing lots of different "perfcapreasons" in GPU-Z, I now see NONE, outputting a log, I get zeroes for perfcapreason the entire time Heaven is running.

The core tops out 1949 and stays there pretty consistently. I know I can push higher, but it's just so stable now, I'm happy to leave it :-).

Is there any chance the voltage curve is written to a ROM on the card and it just needed better settings? Still haven't figured out why performance was so weird out of the box.
post #3 of 3
ya your card is fine... I'm trying to find a way to increase the power limit without any soldering lol
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