did you even look over at sell to see if a 750 ti will even work if you were to fit it in properly ?? a lot find out the hard way NO
some models of store bought computers [dell.hp,acer,ect..] may come with a ''locked or fixed'' / legacy or uefi 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 won't 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 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
[example]
http://en.community.dell.com/cfs-file/__key/communityserver-discussions-components-files/3514/1030.DESKTOP.jpg
in the end any upgrade you do is all your own risk . the prebuilt
http://en.community.dell.com/support-forums/desktop/f/3515/t/20003518
or may need
''Pros: Legacy switch! I don't know why this isn't advertised more but for someone using a HP computer running a legacy bios this card is my savior. Even under pressure it seems to handle mostly everything I throw at it plus it's quiet and affordable''
https://www.newegg.com/Product/Product.aspx?Item=N82E16814127783
good luck
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