weeman8888 :
this is really getting frustrating. so if i order the card will i be able to use it
Sorry we can't be more specific. But this forum (and others) is filled with HP desktop owners that can't get their retail card to work in their machine. It is a common thread. Some get theirs to work, some don't. It appears to be an HP-specific issue.
Here's a related thread that may help: https://www.sapphireforum.com/showthread.php?32410-Help-with-install-of-HD-7870