After a small amount of Googling, I found this:
http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADP019943Quote
the feasibility analysis of possible implementation of a multiprocessor superconductor sub-subsystem consisting of 4,096 -50 GHz Spell processors with their local small superconductor memory interconnected by a multi-stage superconductor switch, all implemented in the (still to be developed) 0.8 jim, 20 kA/cm^2 superconductor technology;
So it seems like they might be able to make a superconductor processor that clocks at 50 GHz, but at current technology levels,"high temperature" superconductors lose their superconducting properties at MOST at about -100°C. I don't know that we'll find a room temperature superconductor in our lifetime, but you never know.