Not to take away anything from Parallela, but you can also get to play around with something that's used in today's supercomputers by buying any Geforce 5xx and

Not to take away anything from Parallela, but you can also get to play around with something that's used in today's supercomputers by buying any Geforce 5xx and start programming in CUDA. A fully documented ARM architecture as an accelerator chip is certainly interesting though. It will take time until the software tooling catches up, but the initial buzz in the HPC community about those ARM newcomers is certainly there. I'd give them a good chance in the long run to outrun Intel MICs and catch up to NVIDIA Tesla. What I'd like to see next is a PCI express expansion card using this technology. See, one of the great benefits about Tesla cards is that you can swap them out in your supercomputers just like you do it with RAM - and you get the newest chip architecture, as long as your PCI bus can handle the load. For multi purpose systems you often still like to have a good number of x86 cores in there however.