Wasn't that just a problem with the 480 reference board?
My slot-power-only 460's sensors claimed it was on-spec, at least. The main problem was that the stock V/F curve was pushing way too much voltage (as usual for AMD), and it could fit an extra 100 MHz within the power budget when I cut the voltages closer.
Maybe that's right and only the 480 had the problem, I'm possibly not remembering it well as it was a couple of years ago now.
I did find at https://www.tomshardware.com/reviews/am ... ,4622.html
that the reporting to the OS wasn't showing the problem, i.e. page 1 says
AMD is right when it says that the Radeon RX 480 GPU is a true 110W GPU. The average GPU-Z measurement result comes in exactly at that point. But that's not the whole story. After all, there’s still the rest of the graphics card, including other components that consume power. And then there are power losses as well.
and page 2 says
Our measurements show that the motherboard’s PCIe slot averages 6.74A at 12V. This means that our numbers exceed the norm by 1.24A, a significant 23 percent. And this is already counting from the absolute maximum allowed by the PCI-SIG’s specifications.
The conclusion of that article, that this shouldn't be a problem, is not one I'd want to test on a motherboard I owned or was responsible for, and certainly not on one which has seen 11 years of duty already!
RX 460 article has a card drawing 89 W in Doom and 104 W in Furmark, of which 46 W and 54 W respectively is through the motherboard.
The specific card reviewed does have a PCIe 6-pin connector which provides the rest of the needed power, which shouldn't even be necessary per spec (it's supposed to be a < 75 W card); this is despite it not really being an OC model, 1220 MHz max in 'OC mode' and the per-spec 1200 MHz in 'Gaming Mode'.
This suggests to me that the design of the RX 460 might be like the 480, a bit off. That RX 480 article said the GPU+board was using 164 W playing Metro Last Light when the spec said 150 W (and tools reported just the 110 W of the GPU itself), this RX 460 one has it taking 89.5 W in the same game despite the AMD spec calling it a '< 75 W' GPU+board. It's running at a sub-5% boost OC, and ASUS saw fit to add a 6-pin auxiliary...