You don't need to "custom design a server supercomputer". This stuff is as mainstream as Dell. You can go to dell.com and order a Poweredge R815 with 64 processor cores and 512GB of RAM for $16,000. If you want SSDs, you can purchase SATA or PCIe ones from Dell as well.

http://www.dell.com/us/enterprise/p/poweredge-r815/pd http://www.dell.com/us/business/p/fusion-io-drive/pd