@mirny GPU-Z - Graphics card tab (the default tab that opens) on the left hand side 10 or so rows down is the field "Memory Type"
Mine says GDDR5 (Elpida). I would assume yours will say GDDR5 (Hynix).


I have an update for people as well with the 280x issue. I have found a repository of STILT's BIOS for the 280 cards here:

https://mega.co.nz/#!45pk0ZiB!UXqe0mwS4HepxmIKAOpNtWNNRyoci_jD-bo49DTRb6o


Also, I confirmed that the flash was successful using GPU-Z and the card performed slightly worse and REALLY bogged my system up so that it was definitely unusable while mining. SO STILT'S BIOS is not working for me. Or perhaps the BIOS was not actually STILT's but the flash was successful according to the difference in BIOS enumeration and the fact that the BIOS loaded. I tried another BIOS I found online and it wouldn't even flash.

Anyways, that's all for my update. Anyone else having issues with the 280x feel free to try the link I provided and see if the BIOS in there works for you. I used the ATI flash utility to flash it. That I found here:

http://www.techpowerup.com/downloads/2306/atiflash-4-17/