Signature just comes with a shirt/mouse pad/cool box. It will be the same clock speed as the SC
EDIT: Anyways if you end up going with a normal EVGA Titan and one SC or SC signature like I did then you can just sync the cards and the normal EVGA card will run at the same speed as the SC or SC signature.
EDIT 2: For syncing the cards you can use MSI Afterburner not sure if the latest version supports the titans yet. Or evga precision X 4.0
Edited by FenixPD - 2/25/13 at 10:07pm