RTX 4090 48gb

Just noticed a few modified RTX 4090's with 48gb from China on eBay.

Has anyone had any experience with these bad boys?

https://preview.redd.it/sclgia8q7jke1.png?width=2421&format=png&auto=webp&s=1bbef00d001df363030367c6fd2453e62551bb2f