[wooger]

32 ARM chips in 4U seems very low to me, just in terms of the TDP a 4U rack is able to dissipate at present. You could increase density a lot.

[pling]

You could but I want standard storage per node (PCI-E FLASH), redundant PSUs and the TDP of a hefty FPGA going flat out is a lot larger than that of the ARM core.