To know, you have to open up your tower and look at the motherboard. See if you can find a spare PCI-express slot. If you have a full length one (they come in PCIe x1, x4 and x16 varieties) then it'll work with any modern graphics card. After that you need to check if your tower is a "slimline" model or not to tell if you need a "low profile" graphics card. You should be able to tell just by looking at the width of the tower or not. You should also check the available space inside the tower to make sure you can fit the 10cm or so of a modern graphics card. Finally, check the power supply to make sure it has enough juice to feed your current computer AND a modern graphics card on top. Cheaper Dell PCs tend to only have a minimal wattage PSU, where as you want at least 450W, preferably 550W or more.
If all of the above is fine, then feel free to go ahead and buy it. I could've checked for you, but the effort it takes to look up obscure motherboard names like that... where as all you have to do is open your tower and see for yourself.