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anyone having issues with RX 6800??

My 6800 Fighter is constantly fluctuating between 40 and 62mhs, from 100w to 180w, regardless of what settings I input in radeon wattman.
But I dont know if its a compatibility issue, since I have all kind of cards in my rig (2x3080, 3070, 5700xt, 1080ti, 6800) and the Fighter is my main card( the one giving signal to the monitor)
Anyone else experiencing same issue?

I have noticed that Radeon 21.2.1 that I get driver crashes with PhoenixMiner. 21.2.2 and 21.2.3 helped reduce the number of "Driver not responding" warnings where the driver recovers, but that would explain some of the issue. 21.3.1 has been confirmed to not work with PhoenixMiner and a fix is expected in the next version(but no ETA has been stated yet).

Now, because you are using different video cards in the same system, there COULD be some issue with cards not cooperating with each other and confusing the miner. You may want to make sure that for RDNA 2 cards that you don't have any other Radeon cards in the same machine for testing purposes, because something strange may be happening at the driver level.

Note that I am fairly new to mining, and am very small scale(single GPU system), but I also have a PowerColor Fighter 6800, and while it works well with 21.1.1, I've seen the problems with the newer drivers. If my single GPU rig has driver problems, at least that isolates the source of problems. As I mentioned, Radeon Software 21.1.1 will be your best bet for use with PhoenixMiner.

Not sure about the RX6800 but radeon drivers 20.11.2 have been very stable for me. I tried to update and immediately got crashes.

Use DDU tu uninstall the old drivers, then install 21.2.3, best drivers so far (I own a 6800 too).