upgrade my cat

Hi

I think about add card 6x GE to my cat 4006, but i afraid that my cat will can't use this card with full bandwidth. Supervisor 2 have 24Gb/s bandwidth, when i summary my traffic i get 10Gb/s in and about 7 Gb/s out but my bandwidth utilization show me 12-14% i think that the snmp is not precise

Now i have: supervisor2 with 24xGE + 48xGE + 48x FE, maybe i should buy supervisor 2+ additional ?

sh proc cpu:

CPU utilization for five seconds: 36.27% one minute: 40.39% five minutes: 40.09%

9.01% Packet forwarding, 19.90% Switching overhead 6.13% Admin overhead

best regards popo schillaci