Low profile card in NON low profile case worked!

much to my disappointment I found out that the HP Compaq DC 5800 micro tower desktop computer is not built squarely. (happen with two PCs of same type)This means that if I use extension cards built for this size case I am unable to put the cover on my PC because part of the card protrudes when it is snapped in securely. I however have found a way around this problem: this time when buying my expansion video card I purposely chose a low profile one. This shortened the mounting bracket of the card and enough that I am now able to snap the side cover on my PC

Yep, the card usually the same but the mounting bracket makes a difference, come cards come with both brackets. The older horizontal [non-tower] cases were easier to work with in such a situation, all the weight of the card was in the slot.