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The Boxster has a reputation for bad water pumps. Sometimes the impeller blades break up and of course water flow is reduced if some of the blades are missing. I've seen recommendations that Boxster owners should think about replacing their water pumps every two years. Personally i suspect that could be your problem. Even if the fans are functioning correctly, if the water isn't flowing you're going to overheat. I think you need to rule out the water pump before going crazy on fan issues, etc.
The fans have two speeds. They are very loud and forceful in high speed. You might need weather up toward 90 with the AC on before the fans will shift to the higher speed.
On my 2000 S the temp needle never gets past the "0" in 180 no matter what the conditions (slightly beyond straight up). I was idling for about 5 minutes yesterday in 99 deg temps while parked and that's all the higher it went with the AC going full blast the whole time. It sounded like a hovercraft between the radiator fans and the engine compartment fan.
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