ATX PSU would have to sit outside the case.  You can always Google TFX PSU's but I can't guarantee the fit. Other compatible GPU's for your system: [IMAGE] I'm sure there's YouTube videos showing the 7010 DT, and other Dell DT's, running 75w cards.  So I'm sure you noticed it's outside of Dell specs.  No guarantees of how long it lasts.
So i currently have a dell optiplex 7010 DT that i am looking to upgrade for a bit of light gaming. Not looking for it to handle the latest tripple A games or anything like that more simple ones if you know what i mean. Anyways the specs it currently has is an i5-3470, 16GB DDR3 1600 MHZ ram and a gtx 1050 low profile GPU. now when I've done a bit of research its been recommended that a 300W psu is the recommended wattage, however the psu i currently have is 250W so i'm looking to upgrade the psu. Now that is also when it gets a bit tricky because a bit more research has told me that dell cases are different then most standard ATX cases etc. So its confusing on what PSU to get that actually fits. Is there any recommendations of any type of PSU anyone would recommend?  I have also been looking at 500W PSU to future proof my system if possible however upgrading a PSU is something i've never done before so I dont know if that is physically possible or weather my PC would only be able to hold a 300W PSU or anything like that. Sorry for the long paragraph but any help is appreciated, thx!
Dell Optiplex 7010 DT PSU Upgdrade