One other thing: On my 5810, the plastic shroud on the GTX 970 (top of card) didn't have enough clearance to allow me to place the side of the case back on, until I removed the rubberized handle on the inside of the side panel. I don't recall if the T5500 has this handle. The point of the handle is to allow you to easily handle the case side, but also to gently secure the card into place. You may also want to purchase the card on Amazon, so if there is any issue with installing this card, then you can return it hassle free.