Not sure how I feel about the price. Surely you can get a socket 2011-3 board for the same price?
Either way you are going to need expensive ddr4 and the cost of the cheapest haswell-e chip isn't that much more than the top of the line skylake i7.
Going with those board and a quad core might get you support for more gpus but it's still not the same as the native support that haswell-e offers and I bet the price is similar. I don't have time to crunch numbers so it's just speculation.
I just feel that anyone who needs that kind of graphics power is going to understand why they might want haswell e over skylake right now.
This. If I'm running 4 GPUs, they're most likely going to be one of the top performing GPUs out anyway, and I wouldn't want a 4c/8t i7 trying to power 4 980 Ti's along with trying to compute what you're going to be running (4k or more).
5820k with EVGA Classified board:
[PCPartPicker part list](http://pcpartpicker.com/p/TnLtLk) / [Price breakdown by merchant](http://pcpartpicker.com/p/TnLtLk/by_merchant/)
Type|Item|Price
:----|:----|:----
**CPU** | [Intel Core i7-5820K 3.3GHz 6-Core Processor](http://pcpartpicker.com/part/intel-cpu-bx80648i75820k) | $379.99 @ B&H
**Motherboard** | [EVGA Classified EATX LGA2011-3 Motherboard](http://pcpartpicker.com/part/evga-motherboard-151hee999kr) | $374.27 @ Amazon
| *Prices include shipping, taxes, rebates, and discounts* |
| **Total** | **$754.26**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2015-11-11 10:37 EST-0500 |
6700k with Classified:
[PCPartPicker part list](http://pcpartpicker.com/p/FyRfLk) / [Price breakdown by merchant](http://pcpartpicker.com/p/FyRfLk/by_merchant/)
Type|Item|Price
:----|:----|:----
**CPU** | [Intel Core i7-6700K 4.0GHz Quad-Core Processor](http://pcpartpicker.com/part/intel-cpu-bx80662i76700k) | $374.99 @ Newegg
**Motherboard** | [EVGA Z170 Classified EATX LGA1151 Motherboard](http://pcpartpicker.com/part/evga-motherboard-151sse179kr) | $399.99 @ Amazon
| *Prices include shipping, taxes, rebates, and discounts* |
| **Total** | **$774.98**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2015-11-11 10:38 EST-0500 |
The Haswell-E is actually slightly cheaper, and you get more brute force. I would probably spring for a higher end chip though, if I'm already spending over $2k on GPUs alone
😛