|The back of the J916 with the two cabinets bolted together. Each cabinet has an AC power entry box which we had removed to prevent damage to the power cord during the move.|
|Some assembly required.|
|The Central Control Unit Panel. Photo by Dave Fischer.|
The CRAY J916 systems begin volume shipments this month, at U.S. list prices ranging from $225,000 to $1.5 million for systems with four to 16 processors...We're not sure how much this system actually cost new, but from the above quote we estimate that the list price of our 8 processor J916 was likely close to $850,000 in 1996. That is equivalent to about $1.3 million today taking into account inflation.
The handy Worksheet for calculating electrical requirements also has a section for air conditioning. The Processing Cabinet could produce a maximum of 12,000 BTU/hour and the Peripheral Cabinet 14,000 BTU/hour. Again, ours is a moderately configured system so, as with power consumption, the numbers are lower. We estimate just over 7,000 BTU/hour. To put that in perspective: this Cray could heat nearly 1,000 gallons of water by 1 degree Fahrenheit per hour while running if everything were turned on.
Between the list price and the heat generation it becomes clear why there is a sophisticated CCU to monitor for temperature faults. There is a loud rush of air from the cooling blowers when the system powers up. The Processing Cabinet blower can move 1,200 cubic feet of air per minute. The Peripheral Cabinet about 1,400 CFM. If any of fault conditions occur there is a piezoelectric buzzer that sounds an alarm.