is there any faster miner for grin and AMD then GGM?
have you tried any of the bminer builds?
Does it support Grin with AMD (rx500 or vega series) cards? I think it says it supports AMD overall but not sure about grin?
I'm using GrinPro 1.1 through AwesomeMiner for 4 XFX - AMD Radeon RX 570 RS Black Edition 8GB GDDR5 PCI Express 3.0 Graphics Cards (RX-570P8DBDR) and I'm getting 6.4H/s at ~525W. I have a feeling that it can perform better but I can't figure out what's going on with these cards. I just installed them so I haven't flashed any bios or anything. I was actually reading that I didn't have to because it has the dual bios switch (handy.) But for ETH I'm only getting ~110MH/s for the four cards. So I'm guessing that 6.4H/s is going to be about as good as it's going to get.

Seems
one GTX1070 at 130W power consumption gives practically the same hashrate as
three RX570. Is it still so profitable to mine GRIN with AMD GPUs ?
Yes, but meh
dang. thats quite a difference.
Very, let's hope that the devs can tweak the software enough to make mining Grin with AMD cards profitable.
all the good devs that invest in AMD miners are in CN algo - not many miners out there for ethhash or similar algos...that the problem now...doc, jce, teamred had many experience with AMD cards, but not with the algo
i hope one of them know the potential incoming fee if they can tweak AMD GPU for grin (maybe also BEAM) if they can reach same level that vega hits with (for example) lolminer´s eth performance (without the pill the vega outperform 1080 ti)