> not quite what we were hoping for, but that fills the gaps.

Diamondback's low specs compared to Mamba were to be expected as that's exactly what the roadmap both you and me recently discussed shows. According to that roadmap the next PacketPro chip(s) after Diamondback should be faster than Mamba.

> I don't understand their naming scheme.

Me neither. Just take it as given and don't even dare to conclude specs or performance from the numbers in the name ;-)