Cisco IOS XRv appliance
IOS XRv supports the control plane features introduced in Cisco IOS XR.
More informations on http://virl.cisco.com/
You can set admin username and password on first boot. Don't forget about the two-staged configuration, you have to commit your changes.
RAM: 3072 MB
You need KVM enable on your machine or in the GNS3 VM.
Documentation for using the appliance is available on http://www.cisco.com/c/en/us/td/docs/ios_xr_sw/ios_xrv/release/notes/xrv-rn.html