The only problem with going to a PCI video card verses the onboard video with this model is the AGP texture acceleration. Found in the the Direct X information & setup screen. (click Start/ run/ type dxdiag / enable-disable agp text accel.
AGP texture acceleration is a must when using 2d-3d graphic applications. When trying to run some applications without it the program will crash right back to the desktop screen. Some applications will just not work at all without it.
The BIOS in this model has a video memory adjustment. But it is based on a percentage of total RAM.
The more RAM you have , the higher your video memory adjustment can go. So depending on what you use the computer for, it may be more benificial to increase the memory to get better graphics , than to change to a card with out some of the benefits you have already.
Also make sure you have the latest Direct x version.
Windows 7 on that model will not use Direct X 10 or 11. I believe with the onboard video, DX-9c is the limit.. Also if you can, use a PCI mounted sound card (even if it's just a cheap one) so you don't use up system resources (cpu & ram) with the onboard audio application). Documentation Documentation Documentation
Here is a page from TIGER DIRECT with more detailed pics and 3/4 down the page is a diagram with the different types of video card slots.
Although I may be wrong, it looks more like an AGP than a PCI card . but then again, does two sections fit in the long area of the PCI slot http://www.tigerdirect.com/applicati...oductresources