One Vega 56 referent (64 bios, samsung mem) have hardware errors:
[48C, fan 71%] ethash: 48.36Mh/s, avg 48.54Mh/s, pool 47.27Mh/s a:9112 r:0 hw:164
already lowered clocks and mem in Overdrive Ntool:
960/850 core and 1055/850 mem
memtweak:
--CL 20 --RAS 30 --RCDRD 14 --RCDWR 12 --RC 44 --RP 14 --RRDS 3 --RRDL 6 --RTP 5 --FAW 12 --CWL 8 --WTRS 4 --WTRL 9 --WR 14 --REF 17000 --RFC 249
Another card hash 49.1 with same memtweak and 976/850 1075/850 without hw errors.
Any recomendations?
txs
Not all memory is the same - some can take more aggressive timings, some less. I would trim back your timings changes to a minimum set (and reduce REF), and build from there:
--REF 15600 --RFC 248 --RAS 30 --RP 12 --RC 44 --RCDRD 14
This will prob get you to 99.5%+ of your list anyway. If these still don't work - try reducing REF more (try 11700), then maybe RC, then RP - those are your biggest movers.
Also, are you sure you need 850mv for those settings? All of my vegas (including the flashed 56) are running 930cclk/1028mclk @ 800mv for 47.4MH/s.
EDIT: Take a look at your temperatures (esp mem) on the two different cards as well. Higher mem temps cause faster charge decay requiring more frequent refreshes (i.e. lower REF). Mine do just fine w/ REF=15600, but mem temps are all in the high 50's to low 60's.