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All,

Quick question, is anyone else experiencing instability with the RX5700XT?

It will sit at 51mh/s for a few rounds and then drop down to 21, 8, 9 before going back up to 51mh/s

Power Limit -45%
Memory Max Frequency 910
Core Clock Frequency Auto

Checked Board, Riser and PSU with no luck

On latest drivers and Claymore version

Mine does that too.
I'm actually having more serious issues. I have three cards and can't get my memory any higher than 900. The rig locks up.
Core clock 1300
Memory 900
Core voltage 800

So it'll run for about 20 minutes and then reboot itself. No idea what's going on with it.

reduce core voltage to 750. Reduce -tt to 54 or lower until it becomes stable. You can even raise memory clock to 930 and find proper lower -tt after that. If you don't wanna lower your target temperature (-tt) you have to lower memory clock (-mclock). So you have to find the balance between -tt and -mclock by experiment.

Can't get it less than 800 with Afterburrner and with Wattman it reboots whenever I hit apply. I'm thinking that I might need to clean install Adrenaline. But I get a system lock up if I go any higher than 900 on my Memory. It's probably just one of the cards (of three) but I haven't had time to try them one by one to find out.
I did find *some* stability by reducing the power limit -25. It's been running for 8 hours so far. 50.55MH/s and about 105w from Wattman (each).

I can't determine how much the entire rig is using from the wall though because I have everything ran from a 240 and a PDU that has 5 PSU's connected but I can say that for 19 cards I'm drawing 2.9kW (three rigs.) I've just never had this much trouble from a rig before. Sad

Try -mclock 750 from command line.It should work.

You mean -cvddc 750, right?
Yeah I've tried. Freezes everything up.
Maybe some cards have different memory types like Hynix, Micron, Samsung, etc and that mas something to do with it.
I'm using three XFX RX 5700 XT models.

-cvvdc is the voltage of cores. It has nothing to do with memory. Did you tried ... -tt 53 -cvddc 750...?

I have tried -tt 80 -cvddc 750 and it locks up.
-tt 80 -cvddc 800 -powlim -25 works.
I've also tried -tt 80 -cvddc 750 -powlim -25 and it freezes too.
Only stable if I use -cvddc 800 for some reason.
And I can't do -mclock 910 only -mclock 900

So my command is currently
-tt 80 -cvddc 800 -mclock 900 -powlim -25 -fanmin 0

I have this three card rig in a tent with two other machines. The ambient temperature is 110F. I have an 8" blower pushing air from outside directly onto the three cards but the temps are still ~80C.

EDIT:
I think I'm getting close.
My machine has been running for about 7 minutes with this: -tt 75 -cvddc 750 -cclock 1300 -fanmin 0 -mclock 900
But if I do -tt 75 -cvddc 750 -cclock 1300 -fanmin 0 -mclock 905 one of my cards drops to 0MH/s after about 5 minutes.

And... it crashed at after about 30 minutes.