GTX 280 is said to be a hot one
Fuad Abazovic (Fudzilla) says he was able to get his hands onto a Geforce GTX 280 - and got his fingers burned.
According to the number one source of (often correct) rumors, the chip of the Geforce GTX 280 gets rather hot. The GPU temperature is said to be around 70 degrees Celsius. The back side of the card could even be above that. Fuad says:
We couldn't keep our hand on the back of the card for more than 3 to 4 seconds and we can tell that this card is as hot as Radeon 4850 with its tiny single-slot cooler.
Grafikkarten-Rangliste 2017: 33 Radeon- und Geforce-GPUs im Benchmarkvergleich [Mai - jetzt mit Titan Xp und RX 580]