New iMac Video card stealth upgrade: mobility Radeon HD 2600 XT?

I'm going to mark this one rumor for right now, but there's an interesting thread going on over at MacRumors Forums that suggests that the new iMacs may have a stealth upgrade. When they were announced a lot of folks were disappointed with the included Radeon HD 2600 Pro graphics card, however, some people have discovered that (at least running Windows in Boot Camp) their machines appear to be reporting that the GPU is actually an underclocked mobility Radeon HD 2600 XT, which is a more powerful chip. This would not be the first time that Windows has revealed hardware that Apple wanted hidden, as several machines were discovered to have draft 802.11n wireless networking chipsets in that way before they were later activated by Apple. Many are expressing hope that some future update or some ATI specific tool might unlock the hidden power of the GPU, but at this point it seems to be wishful thinking.

Thanks Marin!
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