Can Thunderbolt handle that amount of data or will it become a bottleneck?
It can be a bootle neck and already has been for some users. TB in its latest announced form only runs at 20 giga bits per second. That is bits, 1's and 0's, per second. Some of the ideas expressed so far, in relation to current know TB technologies, are just asinine. TB is slower that PCI Express One (1) in its sixteen lane form and version one of PCI Express is old technology.
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My *guess* is that it'll still be priced around $2500 entry (assuming roughly the same features and workstation grade CPU)... $1500 would undercut the iMac, as well, it would be in a range of more of a tech-enthusiast device .... IMHO only!
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That is kinda the point! By the way that is a base or entry level machine. Power users can and will pay whatever they want for all the performance they can get.
The idea with the low entry level price is to build volume and suck in customers. Volume is needed to sustain the model else it fall victim to the axe just like the servers did.