Topic: Red Devil RX 5700 XT behaving oddly - what am I missing? (Read 125 times)

One of my RX 5700 XT cards is behaving kind of strange, I can get it to 57 MH/s at 100 W, which is great, but it can't go higher without a serious increase in wattage (like 120-140 W).

The card is cool so that's not the problem.

When I undervolt it to 825 mV I'm getting those numbers at 1800 MHz mem clock and I can't increase the mem clock further without crashing.

When I increase the voltage to 850, 875, 900, 1000, with each setting I can reach higher mem clocks. All the way up to 1860 MHz (at 1000 mV), at which point I got 58.2 MH/s but for the price of 140W, which is no good.

I'm also noticing that sometimes with the increase of the mem clock I start getting a lower hashrate. For example, I get 57.0 MH/s at 1800 MHz but when I increase it to 1810 it goes down to 48 MH/s. I'd think it's thermal throttling but the temps are very low.

The only mods I did were the memory straps (copied 1550 to all upper values) and I changed the DRAM 12 timing to 6000. GPU clock is at 1400.

The card tends to produce invalid shares. I can get it to be stable, albeit not with the hashrate I want. I know for a fact RX 5700 XT should be able to go to 58-59 MH/s, this one should let me push it to 60 since the temps are really cool. It should be able to go there, but something is stopping it. This card doesn't like something I'm doing to it.

For reference, my four Asrock RX 5700 non-XT cards are running at 1870-1880 MHz for hashrates 58.5-58.8 MH/s without invalid shares.

What am I missing? Should I try a different BIOS type, maybe one with 1500 mem straps (mine are 1550)? Or are these straps too tight and I should copy 1800 straps to upper values, leaving 1500/1550 as is?