I discovered the other day that you can google `Xgb/Xgbps` and it'll give you a result in seconds. 4GB is 0.8 seconds :)

And regarding that 1.5-3.0Gbps across 2x10Gbps... a) wat?!?! and b) I wonder if the number of horribly misconfigured networks exactly like that are out there giving 10Gig a bad name and hurting adoption.