So I currently own a Dell Inspiron 537s Desktop slimline. I would like to get some more ventilation and room for a bigger graphics card and better power supply in the computer. Is it going to be possible to upgrade to a microATX or Mid Tower? If so how difficult will it be? The motherboard is the Dell 0U880P, so I am not sure whether the screw holes are different than what a normal case would have. Also if you can recommend a good case that would be great. Thanks.
If you go to a new case you will also need a new power supply (case plus psu total $50 for junk, $100 for good stuff). Then you will need to do the work to fit the MB and attach the cases' external connectors to your MB. once you succeed you have a MB/cpu combo that will limit your performance enough that there's no point to get a good video card.
Surprisingly I can run just about all the source powered games on full res, medium settings. I have had the 8400 GS (only 256mb) for a while and the fan doesn't work, so I have had the side off of my slimline tower with a box fan pointed towards it. It keeps it pretty cool. So hopefully with the 5570 the fan on the card will be enough to keep it cool without me cooling it with a box fan.