Went with 750W 80 Plus Titanium PSU (94% efficiency) http://www.newegg.ca/Product/Product.aspx?Item=N82E16817438063 …. It'll pay itself off in 1-2 years and has a 10 year warranty.
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Even the i7-6950X is 1S, as are some Xeons. You pay a premium for 2S and then 4S for otherwise identical CPUs...
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2S to 4S is an insane premium especially at the top end. Check out http://ark.intel.com/products/91317/Intel-Xeon-Processor-E5-2699-v4-55M-Cache-2_20-GHz … and then http://ark.intel.com/products/93805/Intel-Xeon-Processor-E5-4669-v4-55M-Cache-2_20-GHz ….
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They also crippled the 4S one with an arbitrarily lower Turbo frequency, and AFAIK Xeon CPUs are locked so you can't raise that.
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A really nice thing about this i7-6950X is that per-core overclocking can be used. Can likely use 4.6GHz+ with 2 cores active.
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So it can work well for the parallel workload (currently 4.1GHz with 10 cores active and 20 threads via HT) and single-threaded.
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And with a 50% discount on any Intel CPU available to us, it really made a lot of sense to buy something quite expensive.
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Memory bandwidth / cache matters a lot too. This has 25MiB of L3 cache and quad channel DDR4 2400. Huge memory bandwidth.
End of conversation
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