Has anyone else noticed an issue with the power flatlining and the hash rate getting a boost on GTX 1080's? I've had two separate cards, one MSI FE, the other Gigabyte G1 Gaming, and both will run for hours (sometimes days) at a time before the power goes from it's usual noisy band to a flatline. The plus side is the hash rate (on lyra2v2) goes up 2-4%, while the power reports being at the limit (81) or sometimes lower (71, see pic below). The downside is the GPU temp increases 3-4 degrees, which is fine because I run it at a cool 69, so it only hits 72-74, but still, I'd like to know what's happening. I suspect my PSU (EVGA 500W) is not enough for an OC'd 3-fan 1080, but I'm limiting the power to 81%, and there's nothing else running on the machine besides p2pool. Anyhow, it was an amazon warehouse deal, so someone else returned it, possibly for this exact reason. But the thing is, I like this, and I'd like to know how to *force* the card into this mode, because I'd like to permanently get the bump in hash rate. It'll stay in this "flatline" mode for hours, sometimes 24+, but eventually it goes back to the normal noisy band, then returns again later (usually around 12-16 hours). I just got heavily into nvidia-smi, so I'll try to capture a log when it happens next time. Some good settings in smi if you haven't dug into it.
Win 10, i7-4770 3.4 Ghz, 8GB DDR3, EVGA 500W, Gigabyte GTX 1080 G1 Gaming (not OC model, but base clock 1695), in a Dell XPS 8700 (yes, it's a factory dell and MB, I know, I know).
Normal Operation: (ignore flat core clock chart; it was auto-boosting/falling back as usual; i just hadn't changed msi default 1500 max on that chart; fixed since):
Flatline "Boost": (ignore 1696 flat core clock chart; it was auto-boosting and dropping back to base as usual; I just hit printscreen when it was on 1696):
