You can save a ton of money by building your own machine.

The server we sell is packaged with software we wrote that makes administering significantly easier. We also provide technical support and even a limited amount of free machine learning consulting. The customers who purchase this server want a headache free solution and aren't as price sensitive as a lone researcher.

heres a part list to build a pc with 1080ti's: https://pcpartpicker.com/user/Jjn2009/saved/#view=McvMpg

notice the custom part box accounts for two more GPUs, I'm not sure why the site doesn't let you add 4 to the GPU section.

This setup ranges from $5250 with 4 GPU to $3240 with 1 GPU. You might want to bump up the PSU for 4 GPU its currently 1500 watts, which may or may not be enough at max load. The article shows a max of ~2800 watts with 8 GPUs

nice - btw, the Rosewill Tokamak 1500 from newegg is a way to save a few bucks on that build, though it's out of stock (they just had it on sale). It's also 80+ titanium.

Actually, that's a pretty bad config:

Mobo does not support 4x16 PCIe lanes (that's why they didn't want you to add 4 GPU cards).

Mobo is limited to 64GB RAM.

$520 for two 256GB 840 Pro SSDs? Seriously?

Here's a better mobo: https://www.amazon.com/Motherboards-X99-E-WS-USB-3-1/dp/B00X...

Also, you can literally double the RAM for the same money: http://www.ebay.com/itm/128gb-DDR4-8-Crucial-16gb-DDR4-2400m... (keep in mind that speed of RAM is irrelevant for DL tasks).