Well there's "TDP specs so we can technically claim our product conforms to PCIe specs, etc" and then there is "TDP specs because shit melts if it gets any hotter than this".
What you see there is the 5970 engineered to elevate the overhead to the latter, but it will no doubt be "stock clocked" such that if conforms to the thermal budget alotted by the former.
Same way all those CPU overclocking folks manage to overclock their 140W TDP processors to clockspeeds that require the power-consumption to then be in excess of 300W.
Of course you aren't going to do it with your $15 bargain budget 250W sparkle PSU on clearance at Frys either, the whole power-distripution setup has to be able to handle the loads.
What you see there is the 5970 engineered to elevate the overhead to the latter, but it will no doubt be "stock clocked" such that if conforms to the thermal budget alotted by the former.
Same way all those CPU overclocking folks manage to overclock their 140W TDP processors to clockspeeds that require the power-consumption to then be in excess of 300W.
Of course you aren't going to do it with your $15 bargain budget 250W sparkle PSU on clearance at Frys either, the whole power-distripution setup has to be able to handle the loads.