It will fit, but make sure that the power supply you referred to in your other thread has enough connectors to power up that card.
I mean, sometimes a video card uses a Y connector which requires 2 molex (the 4 pin power connectors) on the bat.. thats already 2 out of the 3 you have, which means no powering up the CD-Rom Drive or any fans you have, unless you can get some power connectors.