It supports both 10Gig and 1Gig
Cisco Nexus 5010 28-Port Switch
The Cisco Nexus 5010 is a 1RU, 10 Gigabit Ethernet, FCoE, and Fibre Channel switch providing more than 520-Gbps throughput with very low latency (Figure 3). It has 20 fixed 10 Gigabit Ethernet and FCoE SFP+ ports. The first 8 fixed ports are dual speed, supporting both 10 Gigabit Ethernet and Gigabit Ethernet in hardware and providing a smooth migration path to 10 Gigabit Ethernet. One expansion module slot can be configured to support up to 6 additional 10 Gigabit Ethernet and FCoE SFP+ ports, up to 8 4Gbps SFP Fibre Channel switch ports, up to 6 8Gbps SFP+ Fibre Channel switch ports or a combination of 4 additional 10 Gigabit Ethernet and FCoE SFP+ ports with 4 additional 4/2/1-Gbps Fibre Channel switch ports. The switch has a serial console port and an out-of-band 10/100/1000-Mbps Ethernet management port. The switch is powered by 1+1 redundant, hot-pluggable power supplies and 1+1 redundant, hot-pluggable fan modules to provide highly reliable front-to-back cooling
here is the data sheet
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/data_sheet_c78-461802.html
HTH
Reza
