Here's a few professional benchmarks of the latest iMac 5K versus Mac Pro 5,1 with Nvidia and AMD video. 5,1 with the right upgrades still outperformes every other Mac in almost every test.
http://barefeats.com/imac5K_vs_pros.html
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There's W5690 which can only work as a single CPU and there's X5690, which is intended to work in dual-CPU setup.
http://barefeats.com/imac5K_vs_pros.html
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Isn't the the 6 core 3.46 a X5690? I'm so lost.
There's W5690 which can only work as a single CPU and there's X5690, which is intended to work in dual-CPU setup.