Vostro 3681 new graphics card

all the user validated gpu for this model

Popular discrete gpu

This forum thread has a number of suggestions.

So all of the above will fit inside the small case?

If that is the case and all will fit what’s the best out of these? 

GT1030 gddr5 probably best in that list.  Get one w thin heatsink in order to keep psu inside case.  A thick heatsink gt 1030 means psu has to be outside case.

this is a good video demo.  https://m.youtube.com/watch?v=LuGbKH6N9Oc

a better card is gtx 1050 ti low profile.

So basically the graphics cards cant fit in? judging by what I've just seen on the video you linked 

A thick heatsink cannot fit unless psu removed from case.

gt1030 thin heatsink w fan example zotac 

Gt 1030 thick heatsink example asus

re: Hi, would the GTX 1050ti fit in Vostro 3681? alos could you send me a link to one as i cant seem to locate one. thanks 

low profile 1050 ti usually has thick heatsink.  It is also usually double slot width. so you will need to mod chassis back wall + remove psu.  this one is considered not fit unless case is modified.

rare exception: low profile single slot width thin heatsink gtx 1050 ti

ASL GTX1050Ti Battle Flag.

https://manatails.net/blog/2017/06/the-most-powerful-low-profile-single-slot-graphics-card/

So the Gt 1030 gddr5 is the best option? without removing anything? 

I used a MSI GT1030 in this model, but it was tricky. MSI heatsink was removed as it was too high for the Dell PSU and a longer slimmer heatsink I sourced from China was used instead. Took a long time to align, plan, drill and tap the four screw holes required to exactly match the board and a few fibre washers to stop the board from flexing. Results are good, however I was doing this for a HTPC, not for gaming and at first I had no improvements as my very expensive 4k dolby atmos AV amp was throttling the bandwidth, world of difference when I plugged directly into the TV.