This what I found in Cisco docs:
The ASR 1002-X:
- Offers a default system bandwidth of 5 Gbps, upgradable to 10 Gbps, 20 Gbps, or 36 Gbps with a software-activated upgrade license
- Houses three shared port adapter (SPA) slots which support single-height and dual-height SPAs, and six built-in Gigabit Ethernet ports
http://www.cisco.com/c/en/us/products/routers/asr-1002-x-router/index.html