Optiplex 755 DOES NOT SUPPORT AGP of any kind. They arent even the same physical size. [IMAGE]Not EVER compatible It has PCI-E X16 Video slot. Lowest card I would recommend these days is Radeon 5450 2GIG card. These are not horribly expensive and they work fine. [URL]  
Hi, Dell User i'd like to know if a  ATI Radeon 7500 32MB VGA S-Video Silent AGP Graphics Video Card would work if you have any graphics card for 10$ that will work please let me know thank you!
Optiplex 755(MT) GPU 75w