Here is the documentation: L3 Hardware Offloading. Fasttrack hardware offloading is available only on DX8000 devices. On DX3000/DX2000, Fasttrack connections do not get offloaded and are processed by the CPU.
Summary:
IPv4 hardware routing is available on all CRS3xx devices.
IPv4 Fasttrack offloading is available only on DX8000 devices. DX3000/DX2000 hardware does not support it.
IPv6 hardware routing is not available yet. It should be released later this year.