ARMv7 means they are probably using 32-bit Cortex A9 processors. Those are quite old, and probably on a 40nm process. The state of the art right now are these from Applied Micro:

http://www8.hp.com/us/en/products/proliant-servers/product-d...

AMD will enter the market soon, too, but I think Applied Micro will hold its first mover advantage with its 3rd gen chips coming next year.

http://www.eetimes.com/document.asp?doc_id=1324104