A bit of engineer's rough estimating:

System was built in 2003 - 8 years ago. Assume moore's law of doubles every 2 years - expectation of 16x more powerful Actual increase in performance - 22x in 1/4th the size

Given that it's then a quarter of the size of system X, that's an amazing increase in peak performance.

There's only one problem - that speed increase appears to owe a lot to the use of GPGPU. As I understand it, whilst research into GPGPU for HPC* is a hot area at the moment, the scale of the actual benefits it offers is still a matter of debate (especially when considering costs and power consumption).