Video cards of high quality can handle alot more heat than 60ºC, some even 90ºC. That's how hot mine runs sometimes when OC'd (Radeon 9600) but it's never failed or shown any artifacts or such. The new 90nm cards should be able to withstand quite a bit of heat and OCing though, you should be able to get at least a 50/100 OC on air without aftermarketing cooling.