All mine have a latch at the front (the end away from the video connectors) and between that and the metal mount on the rear all mine are solid.
Is there something not told here? Such as some custom case?
The one that i bought was too short to fit my PC case. And my GPU is all loose without it. Where can i buy a new one? Its one of those cards you screw to your case.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic