Current #1 super computer is no other than Big Blue's BlueGene/L, located in DoE Lawrence Livermore National Laboratory, with 280.6 TFLOPS.
AMD and Sun are working with Texans in TACC Supercomputer project. TACC (Texas Advance Computing Center) won $59 Million from National Science Foundation to build largest supercomputer, and this baby is currently being assembled - plan is to deliver 500 TFLOPS, or almost double the number that Blue Gene/L achieves.
In order to do that, TACC supercomputer is consisted out of following components:
As you can see, 16.000 AMD Barcelonas, 100TB of RAM and 1.7 PB of storage - all assembled by Sun
If AMD manages to deliver this monster, it will be the very first time AMD has its hearts inside the most powerful supercomputer. We'll see. µ