What part did it blow up? How was it connected?
When I came home, no fans on the card, no video, no boot.
I had 3 cards hooked up with non powered risers. Sending them back and I'll wait for an 8 pin version.
There are scorch marks on the main power to the motherboard.
Even if it was any other GPU, you should never use more than 2 GPUs without powered risers. It sucks that you destroyed a motherboard and PSU.
If you are good with soldering you can fix both the motherboard and PSU but you need special tools.
I have plenty of power supplies, have to get a new motherboard. I even had the clock speed on the GPU's clocked at 1000. Oh well, gives me an excuse to get better cards in a month or so. Until then, get a new MB and put the 280s back in.