As I understand it, if/when proof-of-stake is fully adopted, all those GPUs will become practically worthless for mining. (Presumably they'll be dumped onto the secondhand market or redeployed for POW mining on competing currencies.
If I was to build a good POS mining rig from scratch, what are the priority requirements? Where is the advantage? Would I want many cores, or lots of RAM, or will the computation hardware be rendered moot by network latency? Or will a "good enough" computer perform as well as any bigger/faster machine, assuming that blocks don't normally contain gas-hungry calculations?
In a nutshell: what are the hardware requirements for POS mining, and to what extent is it worthwhile to build a bigger/faster machine?