looks like bs to me.
also do the calculations - 900H/s = 5*rx480, 120W*5 = 600W, 250$*5 = 1250$...
WHY?

A single Radeon Pro Duo produce 1000 H/s and uses 300W
It cost about 1200 USD here in Denmark
Any proof of that?
Here is a better...REAL...Rig: http://mintmining.com/mining-equipment
Why would anyone that knows anything about mining build a mining rig with 256 GB SSD and a Quad core?
Are you asking or insinuating? If you are asking, the quad core is used for mining in conjunction with your gpu's. Maybe this is a new technique for you to maximize your equipment.
No. The speed or size of your hard drive does absolutely zero for mining speed. And a Quad core is entirely unnecessary as well. That's not a question, that's based on everything we know about mining, period.