It doesn’t look like it, but this is the most powerful computer in the world.
IBM’s Blue Gene/L operates at an enormous 280 teraFLOPS. This means that it can carry out 280,000,000,000,000 floating point operations per second (calculations of the form ax=b); making it more than 100,000 times more powerful than the most powerful modern home computers. You can find more pictures of Blue Gene/L at the IBM website.
The UK’s most powerful computer is the Atomic Weapons Establishment‘s LARCH supercomputer which clocks in at 32 teraFLOPS; unfortunately most of the details of what it actually does with all that computing power are classified.