When is a 300w card not a 300w card?
When its power draw spikes to almost 900w and trips your PSU!
Apparently, you cannot measure this phenomenon with software sensor based tools like GPU-Z, or HWINFO 64, but it has been measured by the following website:
AMD Radeon RX6900XT显卡功耗分析 – FCPOWERUP极电魔方
"So, What? I have a 1200w power-supply," some of you might be saying. "It's Platinum Rated!"
As it has been explained to me from others experiencing the same issue, that these power spikes can drop the voltage load to levels deemed outside the safe zone of your PSU. A good PSU has both over-volt protection, and under-volt protection (scroll down on this product page for example : https://www.evga.com/products/product.aspx?pn=220-P2-1200-X1) and can activate it's safety measures when measuring a voltage outside the designated range.
That could manifest in such things as Kernal Power Event-ID 41 errors in Event Viewer, Your shiny new card running benchmarks well, but crashing in games, or leave you at a loss why a seemingly mild overclock with all parameters not even touching the limits imposed in the Adrenaline software constantly crashes.
I ask AMD to look at this issue, and at the very least provide some sort of comment (e.g. we are looking into it, this has been debunked.. etc.)
The link in Chinese above was provided to an individual from the vendor he bought his PSU from that will be honoring an RMA on his new PSU due to constant GPU crashes on his new 6900xt. That means the work of the website-author has been acknowledged at least on some level of the industry.
In my specific example, my card will not remain stable in games over 270w. At 270w, voltage is around 1031v, temperature is 78c 95c.
Watercooling can bring down the temperature, but if the power spikes cannot be addressed, there is no reason to water-cool, and there is no reason to pay a premium for an after-market card (e.g. power color red devil with 3 8 pin connectors.)
For those of you having random crashes and scratching your heads as to what the issue is, this could be it. Hopefully it can be acknowledged and fixed with a driver or bios update in the future, as these are beastly cards and amazing performers when they are working.
