IBM's supercomputer runs Fedora

IBM's supercomputer, the Roadrunner, which cost something close to $ 100 million dollars.

IBM is a great company of Free Software as a whole and also specifically to the Fedora project, reports that Fedora is used in the test environment with this and other machines.

Roadrunner Name System
Site DOE / NNSA / LANL
Family IBM System Cluster
System Model QS22 BladeCenter Cluster
Computer QS22/LS21 BladeCenter Cluster, PowerXCell 8i 3.2 GHz / 1.8 GHz Opteron DC, Voltaire Infiniband
Vendor IBM
Installation Year 2008

Linux Operating System
Infiniband Interconnect
PowerXCell 8i processor 3200 MHz (12.8 GFlops)

Why doesn't we hear much about Fedora Linux. In India, Redhat is the only known and taught version of Linux as far as I can see. I have read reviews that states Fedora is the finest Linux.