Update 2pm 19 Jul: My order which was placed 1 minute before posting this deal just got a tracking number, for reference
Luke from TechFast reached out to me about this incredible deal on a RTX 3080 non-LHR model, a good $150+ off from the recent popular deal
Gainward may not be a well known brand in Australia, but they are a subsidiary of Palit, the largest GPU manufacturers in the world. From a quick look around, this gpu cooling is decent enough to mine ethereum without any further modification if you so choose
Upon further inspection, this card seems to have the same pcb as the Palit GameRock 3080, (Source), and the Palit GameRock is renowned to sometimes be able to mine Eth at 100Mh+ @ 175W, (Source), so you may get lucky :)
From Luke:
Cards will be shipping now through to the end of July. These will be the final non LHR cards we have and are getting.
Digital Foundry goes into a lot of detail about DLSS 2.2, which gets rid of a lot of blurry motion and artefacting that you have experienced.
https://www.youtube.com/watch?v=dtbqJXb1UDw
Hopefully that might resolve your issue.