None, iBUYPOWER adds nothing to the machine that you can not do yourself if you can build a PC. If you can't build a PC yourself avoid this company like the plague

As Eric said above me, cables were disconnected. The sata power cable was disconnected which of course meant no HD detected. Would have had to send back if not experienced enough to self diagnose. Laminate sheets left on side panels restricted most...

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I recieved this item almost completely unassembled. everything was in place but no wires were connected and every single screw was loose