If you watch the video from level1techs and the follow up from gamersnexus, you can hear them talk about how this is not something microcode can fix, its not only a power issue, its a design issue. With all of the out of video mem and compression bugs I would look into the memory controller. This also seems to be a smaller fix into itself, they show that some were able to get their machines up and running again once they shot the memory down to the lowest clock (4800 MT I think it was) that the DDR5 could do, and this seems to still be a bandaid and the systems will just outright die soon after, but you might be able to get in your order for RMA before it does.
Cant wait to see how many C level people get canned!! wait.... none, you mean the directors that forced that BS to be this way wont even get tossed out....