Dell has just added a new USFF to its OptiPlex 780 series. The new model only measures 23.9cm x 6.5cm x 23.6cm but still offers easy serviceability, standardized configurations and advanced remote-management capabilities that are similar to the other models in the same series. It equips with mainstream components such as Intel Core 2 Duo processor, processing power should not be an issue.
(source: http://www.dell.com/us/en/business/desktops/optiplex-780/pd.aspx?refid=optiplex-780&s=bsd&cs=04)