how to install graphic card in dell optiplex 745

So, going back to the Optiplex and the Nvidia GeForce 210 Video Card - 512MB DDR2, PCI-Express 2.0, DVI, HDMI, VGA, Low Profile, it looks like Nvidia finally added a small sound card to this video card, so, you can get video and sound, out of the box, through HDMI. Anyway I have this computer connected through DVD-D to my Dell 24 inch monitor, so I haven't had the need to use the HDMI connector. The problem is that this motherboard has an external toslink (spdf) Digital connector, but it doesn't have the internal. I have another Nvidia GeForce 9800 GT installed in my Dell XPS 410 that to have sound through the HDMI connector I have to connect this small cable from the card to the motherboard's Spdf internal connector. It surprise me that the HDMI works with sound right out of the box. This cards Power Supply requirement was 300 watt, but I install it in my Dell Optiplex 745 SFF with a 275 watt power supply and it works great. PNY VCGG2105XPB GeForce 210 Video Card - 512MB DDR2, PCI-Express 2.0, DVI, HDMI, VGA, Low Profile

Today I went to Compusa and bought this video card: But if your motherboard doesn't have the internal spdf (digital sound) connector, you would not be able to use the HDMI connector. The Nvidia Cards don't come with sound, you have to use the computer sound if you plug it through HDMI. I like better the Nvidia Video Cards, but since I want to connect it through a HDMI connector, I prefer the ATI video cards because they come with sound. I'll go tomorrow to Compusa, and buy a ATI card with 300 watt power supply requirement, and try it out. Right now the onboard graphics moves the aero with no problems. I want this card for Windows 7, and i don't want my daughter to be having problems with aero. They don't recomend it, and they called it a crappy card. Thanks 1 got own3d for your help, but i'm not too sure of buying it, because I just read two reviews from persons that bought it from another site, they say that it gets too hot, and that his Vista PC would always pop up a recomendation to shut down the Aero.

How to install graphic card in dell optiplex 745