It's a single HIS 280x OC 1200Mhz and memory 1700Mhz
LOL, your card will not last long
Its a HIS R9 280X iPower IceQ X² Turbo Boost Clock 3GB
Working @78º Celsius
78C is a little high, but within proper operating rate. When you get around 82 to 85, start worrying. I stayed with 1050 core at 1500 memory. My temp stay in the 69 to 75 C through the day with no AC.