Imagine an external "CPU pack" that contains a number of high-end CPUs (and ECC RAM, and ...), and featured Thunderbolt connectivity back to, say, an iMac or MBP, e.g., in a Mac Mini form factor.
Most of the time, my MBP's internal CPU might be good enough, but when I'm rendering lots of video, I could offload that work to the "CPU Pack".
I could also upgrade those CPU packs separately from my iMac -- this might actually be the biggest argument against this product from Apple's point of view, because it could delay iMac/MBP upgrade cycles.
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