I bought the 480 like a lot of us last year when they were on £240 special offer.
Recently I've noticed when booting the card says during POST "Engineering Sample"
It seems that these cards have shipped with the LN2 bios activated by default, not the stock bios.
Pressing the button on the card bottom right corner selects the default bios and removes the ES warning (button in - default, button out - LN2)
Haven't noticed any differences yet running on the stock bios versus LN2
Recently I've noticed when booting the card says during POST "Engineering Sample"
It seems that these cards have shipped with the LN2 bios activated by default, not the stock bios.
Pressing the button on the card bottom right corner selects the default bios and removes the ES warning (button in - default, button out - LN2)
Haven't noticed any differences yet running on the stock bios versus LN2