Hi 2 all!
I want to share what I have observed in last 2 months.
First, I want U to know as I know how to mine, I know to set virtual memory, tweaks, OC, I have minimum 150% power reserve on PSU's, etc, so not noob user here, I have tried all possibilities, with or without IGPU on CPU (knowing issues between AMD and IGPU Open CL parts from driver).
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Now, the problems:
I have one rig with 6 pieces Radeon 5700XTX (moded bioses), first I had it since rig made, on Intel B250 chipset and now trying it on Intel H110M chipset too (the further problems as will be described are manifesting the same on both different chipset motherboards in the last 6 weeks, first I have suspected stupid Intel chipset, that's why I try now on earlier chipset H110M).
In last period, no matter wich drivers I have used (I tried better said) on all 20.x.x series except last one 20.7.1, wich not supported by Phoenix yet, rig fails randomly with no reason, phoenix miner freezes, all GPU's running in the last seconds before system (windows 10 1909) gets locked, all freezed, even remote desktop see it as offline, just hard reset revives rig.
Then after reset/restart, situation repeats, I locked into log.txt file on phoenix miner folder, no graphic card fails, none showing 0.000MH, rig freezes and fail at around 52.xxMH .
I mention in the last month, I have left mem freqs stock at 1750MHz, to be sure the fail is not because GPU's mem OC, so exclude OC can generates fails, I tried leaving stock even GPU freq and voltage too, so stock all card settings, as factory.
Same problem, random fails, sometimes after 20-40 minutes, sometimes after 3-5 hours, and before that it have run more than 200 hours perfectly with no fail or intrerruption, no matter if OC/undervolt GPU or stock freqs on mems and gpu's, same rig, same settings, same temperature (57-62 celcius degrees).
I have customized windows version (no antivirus, no junks, no updates by any kind), that worked perfectly until last almost 2 months singe problems has begun.
Problerms are not daily, it happens in last time period, 3 weeks ago, rig runs smooth for 198 hours with 20.4.2 driver, and 4.9C Phoenix.
Now, even PM 4.9C seems to be not stable anymore too, a friend of mine also with 5700XT cards claim it too, so many fails!
What the hell is happening?
Is maybe because Phoenix is trying to help as much as possible mining with old RX 4xx-5xx 4GB series cards in implementation of last versions of PM above 4.9C (most stable miner ever for me), creating problems for RX5700(XT) series?
I have observed as closer come to the DAG 37x wich will go obsolete 4GB cards for mining, and more trying/upgrading versions pf PM (now is 5.1E) to keep mining with old 4GB Radeons, can affect in negative matter the RX5700(XT) to many fais miner?
The other rig that a friend of mine owns it, I have made it with 6 Radeon VII, rig runs flawless for weeks, no fails, no intrerruption,I have used on it same customized windows version 1909, (no antivirus, no junks, no crappy updates), both systems using valid keys for activation.
Why only radeon 5700(XT) rigs fails randomy? I have 2 more friend wich shares the same type failures, they have good rigs too, with adequate PSU's, so no hardware troubles, as their rigs works flawless months ago, they-re have monthly maintenance, cleaning, etc...
Also for the ones wich uses Radeon VII cards, the best driver (wich better boost and stability) is 19.7.4, I have tested alot of drivers but this 19.7.4 rocks!
So, maybe anyone can solve mystery why just Radeon 5700(XT) fails with no reason?
Today, since early morning, I tried SRB miner instead phoenix, 0 fails until now, but around 1MH lower hashrate for each graphic card. In the end I prefear to lose 5-6MH on rig and stability instead 10 restarts by day because Phoenix fails ald lock the rig.
i had the same problem i narrowed it down to phoniex needed a higer core and lower mining intensity
i run my modded 5700xt and 5700 cards with mi 12 and core 860
and they seem stable 3 days now at 55.6 mhs, phoniex says 120 watts but im sure its like 140
i think a few cards cannot handle lower than 850 core or it was the mi, value ill play with both settings more