I built my home compute cluster out of four Odroid N2. These are $80 ARM based single board computers (SBC's), similar to Raspberry Pi's. You can bridge the g

I built my home compute cluster out of four Odroid N2. These are $80 ARM based single board computers (SBC's), similar to Raspberry Pi's. You can bridge the gap between high and low ends buy buying low end and scaling horizontally. The troublesome piece is, of course, the horizontal scaling. For a cluster of ARM CPUs to be worthwhile, you need a job that can be parallelized, but not so massively parallel that it already runs on a GPU. Even so, I think there's a lot of potential for these low end ARM devices. Ultimately, their impact on x86 could be the same as what x86 did to the previous generation of mini computers.