I see here that many people claim to get 1950 Hs with memory speed of 945 or so. I'm wondering what i'm doing wrong - i'm also getting 1950, but with memory at 1100 (and gpu at 1407). If i set memory to 945, hash rate goes down to ~1700-1750!?
I'm using Vega 56 cards, with 64 bios and registry files for HBM1100. And of course, blockchain drivers and latest version of Cast XMR.
P.S. i have 6 cards, tried with single one and same result. I'm also using only 2GB of RAM, not sure could that be an issue (but i doubt, as all calculations are done inside GPUs).
thanks
well, you modded the BIOS, that's the most likely cause. For instance, I can't mod it because the cards in the rig arent mine. But the 6 Vega 56 GPUs rig whose owner wanted me to build for him are set up to run at 935MHz, with OverdriveNTool -I dislike AMD Wattman, it's enough having it on my desktop computer every single day- managing the settings.
At 935MHz the unmodded Vega 56 mine at around 1940H/s with
100% stability (= 11600-11700H/s all of them combined), which in the end is what makes the biggest difference. @commonrnx shared a couple of very interesting videos on modded Vega 56 cards.
I have no experience with modded cards but the settings are ok for a modded Vega 56 GPU afaik -Vega 64 HBM can run at higher speeds, which is what a modded Vega 56 achieves-, 'cos they run at Vega 64 speeds, just with lower consumption. Maybe someone who has modded Vega 56 can help you more concretely.
Thanks, I've been running stable all morning at 935MHZ on my unmodded 56's.
I'm at target temperature of 60C
Fan minimum at 2500RPM
TDP 0
Fans are not roaring with these settings but hover around 3000 rpm
I like the big numbers at 0 TDP but there is only a $0.03 gain per day at my electricity cost for the extra hash.
Anyway, all that doesn't matter. 935MHZ seems to be the sweet spot for me with CAST XMR on unmodded 56's.
I save about 47 watts per GPU at the wall moving from 0 to -20% TDP. When I run lower I can set the fan minimum to 2000 RPM and target temp to 60C and fans hover around 2500RPM. That's better for me. I'm so over the ridiculous fan noise.