Hi,
Q. How is encryption different on the integrated services routers generation 2?
A. These routers have a higher-performing, onboard encryption accelerator that increases the VPN performance two to three times that of the current integrated services routers.
Q. What additional IP Security (IPSec) performance can I expect from the integrated services router generation 2 onboard encryption accelerator?
A. Performance improvements are two to three times that of the current integrated services routers.
http://www.cisco.com/en/US/prod/collateral/routers/ps10538/qa_c67_553891.html
Based on the Q&A for the 1941 I would say that two to three times the VPN throughput from its predecessor.
I don't see an exact number of VPNs being specified, but what number do you have in mind?
Federico.