I sent the guy a message through eBay (no red squiggly line for whatever reason) and received this;
"Hi - I bought the card from Taiwan as an GTX780Ti through Aliexpress and that is what is marked on the card. There are a number of companies that make cards with this chipset, so I guess they don't all look the same. I've no reason to suppose that it isn't what it says. Unfortunately, I can't test it on my HP Xeon workstation as it's not compatible. What I am going to do is change the listing to 'Returns Accepted' in case it is found to be not as labelled. Regards - Mike"
Original ad has been removed now, probably something to do with us reporting it.
"Hi - I bought the card from Taiwan as an GTX780Ti through Aliexpress and that is what is marked on the card. There are a number of companies that make cards with this chipset, so I guess they don't all look the same. I've no reason to suppose that it isn't what it says. Unfortunately, I can't test it on my HP Xeon workstation as it's not compatible. What I am going to do is change the listing to 'Returns Accepted' in case it is found to be not as labelled. Regards - Mike"
Original ad has been removed now, probably something to do with us reporting it.