Quote from: io8621 on August 01, 2019, 09:15:27 AM

I proceed like this, I don't know if it's okay but I can have quite stable results.

Example with one Sapphire Rx570 Nitro 4 gb Hynix, vga bios coming with 2 different chip strap, Elpida and Hynix but my card is equipped only with Hynix H5GC4H24AJ.

I tested a lot of strap but memory limit without error is in range 2045 - 2050 mhz, acceptable mem error until 2070 mhz more than 2070 i can not go without thousand of error.

Overclock and undervolt from Phoenix Miner or with OverdriveNT with the same result.

Ref parameter is set to 30.

1100 - 2050 [900 - 900] 30.65 86w
1110 - 2050 [900 - 900] 30.7 86w
1120 - 2050 [900 - 900] 30.8 86w
1130 - 2050 [900 - 900] 30.95 86w
1140 - 2050 [900 - 900] 31.3 86w
1150 - 2050 [925 - 900] 31.55 90w
1160 - 2050 [925 - 900] 31.6 92w
1170 - 2050 [925 - 900] 31.65 92w
1180 - 2050 [925 - 900] 31.65 92w

Clock > 1160 with ref 30 dont give me more hs so i set to 1150 - 2050 [ 925 - 900 ] for ~ 90w and go stable for days without error.

I can go down with core to ~915mv but after some time go to 0 h/s and restart.

Some question:

for cvddc i made test with increase of 10mv each step, but effective cvddc in hwinfo is always a few mv less, exist a precise way to increase or decrease the core voltage? 6 mv step or 8 mv step or other?
plus or minus mv to memory affect memory error?

Your watts are just impossible with these voltages, if we are talking about ETH