I said that they now use desktop processors in the 21.5" which implies the 24" used mobiles CPU's.But 24" used mobile CPUs (well custom but they were 45W). Currently, the 21.5" is using 35W GPU so at least I wouldn't expect anything significantly hotter like 4850. I'm basing my speculation what is currently used, that's why it was impossible to predict 27" with quad core4850 has been sticked into 15" lappies so of course it's not impossible but that would require some improvement in the cooling so that iMac won't sound like an airplane when in use
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Just because Apple used the 4670 doesn't mean that's the max TDP GPU the thing can use.
The 24" with the 4850 is still the best gaming iMac at the moment. If they put the 4850 in the 21.5" it would still be a toss up between the two though(higher resolution vs led backlight).If Apple can stick 4850 in 21.5", then I'll raise my hat for them as that's great job and will definitely stop the whining about games. 5850 in 21.5" is much easier job as it's only 4W hotter than 4670 but provides more or less the same performance as 4850. I really hope they put a good GPU in 21.5" as that's the best gaming Mac IMO due it's normal resolution and acceptable price