@KillrBee

I have a rig of 3090s (6 cards) running on HiveOS. I couldn't reach 11326 mem clock (+3000 in Hive) max could reach was +2900 and after several minutes miner crashes. Cards cooled up using AC direct cold air to them.

I think you are using Windows ?!

one more thing, I used +1200 on Core, didn't try +1600 since Ethhash a memory hungry algorithm