I don't have Kill-a-Watts or rack PDU data for fleets of webservers, unfortunately. What I do have is CPU performance data from running with and without SSL gat

I don't have Kill-a-Watts or rack PDU data for fleets of webservers, unfortunately. What I do have is CPU performance data from running with and without SSL gateways and SPDY in production, and all I can say is that the server's CPU utilization is not significantly impacted by them. I also have client-side data that shows substantial load speed improvements when using SPDY. That should result in a C-state profile improvement on the CPU, but I'll need to collect more data to confirm.