Maybe it can do 500 sols with claymore ASM kernel, but what I'm starting to see here is that they intentionally cut HBM bandwidth in half in the initial driver. Looks like they are intentionally doing this to keep miners away from the cards. Thats the only explanation that makes sense, since there is no reason why these CANT do 800-900 sols theoretically.
AMD should be happy, now amd have another market to supply until proof of work continues, also vega specific mining cards might be a reality and maybe that is why AMD still did not and will not fix the hashrate on Polaris.