Unfortunately, Dell isn't in the business of making upgrades easy or equable for customers. They get more repeat business by NOT making upgrades reasonable. I can, however, tell you that i've personally had limited success upgrading the graphics on dell computers. Looks like the website is pointing you to low profile models, which is confusing me because the Inspiron 560 aslo has a slim model (560s), so i was thinking the non-slim model (560) would have enough room for a standard width card. Is it possible for you to measure the inside of your case from the PCIe card to where the side panel would be, as well as make sure nothing else is in that space?