This is $1.3 million for each of 13.6 teraflop racks of 32 processor boards in volume. $1.6 million in lower quantities.
216 of the racks is about $272 million for 2937 teraflops.
Sun's Constellation in the 500 teraflop version costs US$29.6 million of a total $59 million to build Constellation, and $29.4 million for operational costs.
The full 1.7 petaflop version would probably cost $90 million to build.
So $50,000 to $100,000 per teraflop of supercomputer performance.
The Nvidia Tesla is in the range of $3000-6000 per teraflop.
FURTHER READING:
IBM and SUN announce petaflop supercomputers
Nvidia Tesla details
Nvidia tesla impact on computational chemistry
What it would take to reach a zettaflop
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