The poster was referring (although not very clearly) to 80 Gbits per slot, compared to the maximum of 2x 20Gbit channels per slot today (40 Gbits).

6509 = 9 slots, so 40*9 = 360 Gbits max

If it were 80 Gbits per slot, then the SUP-720 could be fully used in theory.

The 6513 only has 7 slots @ 40 Gbits, the other 6 are maxed out at 8Gbits, so max throughput for 6513 would be 328 Gbits/sec.

The problem (to my understanding) is taht the max 20 Gbit/channel is not a function/limitation of any particular blade (SUPs included) but rather a limitation of the chassis itself. So in order to go 80 Gbits/sec per slot, you'd have to come up with a new chassis.

Nexus 7000 apparently can do some 15.x Terabits/sec (so about 20+ times more throughput than 6500) if you have all the right cards (10G each port)

"The chassis holds a maximum of 512 ports using 10Gb/s Ethernet modules, or 768 ports using 1Gb/s Ethernet modules. Throughput can reach over 15Tb/s, according to Cisco. The box is also compatible with upcoming 40- and 100Gb/s Ethernet technology when it arrives."

I'm not entirely sure I understand Cisco's motive to keep extending the 6500 chassis, because one would think they'd want people to forklift to the next platform and make more $. Could it be out of benevolence? That would be a first.