IB connects through PCIe.

which isn't on this.

As a follow-up - it's one DDR3 channel - maybe 2. That puts it at about 1/30th of a K20.

People have tried to creep into Scientific Computing with processors like this (tile-based perf-per-watt SoCs). They haven't succeeded (see: Adapteva, Tilera, etc.). And they have much bigger budgets. :)

Thanks for saving me a lot of typing. :-)

For the record, the Tesla K20x TDP numbers include the memory (it's for the entire card).

A comment below says that it uses DDR3 1333. Total bandwidth of that, being extremely generous and giving them 6 memory channels (unlikely) puts you in the neighborhood of about 1/10th the memory bandwidth of the K20.

Combine that with the "how do you connect this to other things" problem, and this chip has no chance in scientific computing.

And interconnect them with what?

HDMI?

Man, your records don't back far enough for me, it seems. ;-)

5) ...and Cray is already installing a 20-ish PF machine at ORNL in the next year named "Titan".