I have 3 rtx 3090 asus strix all of them are new, and in a octominer x8 ultra plus. 1 of them I got from eBay, 2 from Newegg. For some reason the memory temp on the two cards from Newegg are running 100 degrees Celsius and the 1 card from eBay is running 90 Celsius. All the cards have the same oc settings and are equally spaced. As well as have the same fan speeds and mining the same mhs.