what I'm trying to say is you need to first find out what cards will work in your dell that's the trick
one link from deell was on a card they said the evga did not work but the msi did ?? same cards but maybe something in the evga cards bios did not work with the motherboards bios ??
why I say I never recommend upgrading a prebuilt - too many things to be uncertain about
heres what I post to prebuilt guys
some models of store bought computers [dell.hp,acer,ect..] may come with a ''locked or fixed'' bios and may not allow you to change certain hardware as a video card.. this is done to protect them from undue warranty claims and refunds .this is not done to hurt you but to protect them. you really need to see if that upgrade has been proven to work in your model first before you invest money in it .. there are a lot of these threads here at toms to look at some models will allow upgrades and some dont.. and a lot of guys here say ya ya ya when is really no no no...it would be sad you spent $200 on a card that wount post after you installed it as most find out. then get told its your psu and you spend more and end up right back where you are now, but its up to you good luck..
you got to know the the boards in these computers are not like the ones we use to do custom builds witch are open to upgrading with in the boards compatibly . the bios is custom made for there design and just for the parts they authorize to be used on there computers there only guaranteed to work as is out of the box as you bought it ,..
also these boards do not have to meet atx standards and there pci-e slot power may not do the required 75w needed for most higher end cards and can be limited to say 45 or 60w that is all thats needed with the low end factory oem cards that it may of shipped with
you buy something stick it in and if it works out great if not oh well better luck next time
see what the dell guy said here
''He did not say what brand or model worked.
This Model may work but you would have to test to make sure.
EVGA GeForce GTX 960 2GB GDDR5 128bit 02G-P4-2966-KR
http://en.community.dell.com/support-forums/desktop/f/3515/t/19617923
all there doing here is pulling at straws