Dell Dimension 5100 capacitor problem
The main things you should try to match or beat are:


Low ESR. Cheap capacitors with high ESR tend to die quickly in cheap computers like most Dell computers.
Higher temperature rating. The higher, the more heat they can take before dying.
Higher voltage rating. Again, the higher, the more voltage they can withstand. 10&nbsp;V would be the next rating up.


Capacitance should be the same and physical size as well, unless you have room to put in a bigger one, but that's rarely the case in a computer.

Note: Most of the same brand/size capacitors in the same area of your Dell 5100 are probably going to die soon due to capacitor plague. Even if they haven't exploded or leaked, they might have bulged out at the top (so it's slightly round instead of flat). Some might even look brand new, but they will still be dead. You might want to pick up a few replacements just in case.