All three 7950GT cards have different cooling systems, that affect overclocking and the temperature of the G71GT core. Below, we provide a graph of the temperature, as reported by Everest Ultimate Edition 2006.

Gainward's cooling system is highly effective. Just look at the red line in the graph above. Looks very good. On the other hand, the eVGA 7950GT KO air cooling system, also does a good job but nowhere near as good as Gainward's. Lastly, XFX's 79500GT passive cooling system is the least effective, reaching 91°C at full load.

For those who prefer straight numbers, in the graph above, Gainward 7950GT ran at 50°C average, the eVGA 7950GT KO at 62°C and the XFX 7950GT Silent at 79°C. Things get pretty hot with the XFX card at 91°C maximum.