Detailed specifications for Tower (4x5) form factor - ThinkCentre M91 (type 4473, 4479, 4497, 4517, 7049, 7053, 7073, 7032, 7136), M91p (type 4468, 4476, 4495, 4499, 4513, 4524, 7034, 7052, 7178) - RO