This is an ISSUE with this particular system (DELL) that card and the Drivers that DELL has decided to use with the system.
As long as the ON-BOARD INTEL VIDEO is enabled the card will FREEZE/CRASH ... We have reimaged, installed physical new card replaced all cables... still same result.
We are trying a totally different video card that we purchased.
Good Luck, hopefully this gives you insight into our issue (Same as Yours) and how we went about trying to fix the issue.
-CMU