1. Will a standard Matx board fit in my Dell Optiplex case? - This is the board I'm specifically talking about, upgrading from a Dell Dimension 2400 motherboard. 2. I bought a new video card, an NVIDEA GeForce 8400 GS to be exact, and I need to update the PSU in order for it to work more proficiently and I'm looking at a 350W one but I'm asking how do I know if the PSU will work with everything? I know the wattage is good because i've checked, but I'm just confused about which one exactly I should get. Like would This work?