Can I put the motherboard from a Dell Optiplex GX620 SFF into a tower or mid-tower case? I'd like to upgrade the video to a PCI-E card, which means upgrading PSU. Also lots more cards to chhose from if I'm not limited to low-profile.
Would it have to be a BTX case?
If so, are there any aftermarket BTX cases out there, or will I need to look for a used one?
If your power supply still works, look for a low profile card such as a 4650 or 4750 chipset with a short bracket to work with your dell case. Some cards come with this shorter bracket at no extra charge. The 2 cards I mentioned will work with your dell 275w power supply. Changing cases is problematic unless you find a dell btx mid tower case on ebay which can use any standard atx power supply. If you do, get a corsair 400w ps which goes for $34.99 after rebate with free shipping at newegg.