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I've thought the ocs for devils canyon were overstated, but I could be wrong. I heard the thermals were a little better, but not as much of an improvement as hoped from the first haswell batch. It depends what you are doing? I'd still want those extra cores if I were a professional streamer on twitch while playing games.
I'm not sure. I went through a few of the DC reviews and all of them managed at least 4.6 IIRC. The i7 is 4.4 out of the box (turbo), so it's not inconceivable most samples would be able to full time that and a hair more on all 4 cores at or near stock turbo voltages.