For those unfamiliar with Dave, he was part of the North American launch of the ASIC (Application Specific Integrated Circuit) Bitcoin mining chip named Bitfury.
Not much is known of the development of Bitfury but the mining cards shown in the video below were originally for sale on Megabigpower.com website selling Bitcoin ASIC mining hardware.
The facility created by Dave is very impressive, calculating 1PH/s drawing 1.3MW of power. This effectively means a 769H/w. Common configurations of mining hardware yield 500H/w. This means the Bitcoin mining ASIC hardware employed by Dave is very, very power efficient.
Based on our napkin calculations, the mining hardware employed by Dave is worth approximately between $18-23 Million dollars.
These calculations are based on Qty 4000 individual mining rigs (or systems) which generate 250GH/s per rig at an estimated cost of $4500 ($5800 retail) per rig = $18 Million Dollars*
*Note: This is full retail pricing and does not include the cost of electricity, warehouse space, racking, networking, installation, etc. We assumed a volume discount of 30% reduction in hardware price.