PCI graphics cards will only work in PCI slots; AGP will only work in AGP slots. PCI graphics cards are EXTREMELY outdated, and AGP is just about out for the most part. So have 2 PCs, Dell Optiplex gx280 and 170L. Have got 2 new PCI graphics cards, Nvidia geforce 6200 256mb, that are detected when installed but the onboard VGA does not disable and as a consequence the PCI card can only display in 8bit 800×600.
The new PCI graphics cards will allow a system that features an integrated GFX mainboard to configure dual monitors through their multiple video adapters. There are any number of standard PCI graphics cards with nvidia chipsets. The various generations of AGP cards are usually referred toin terms of a multiplier. The primary advantage of AGP over PCI is that it provides a dedicated pathway between the slot and the processor rather than sharing the PCI bus. There are three white connectors on the motherboard, one is ocuppied by the phone modem.
The Advanced Graphics Riser is a variation of the AGP port used in some PCIe motherboards made by MSI to offer a limited backwards compatibility with AGP. It is, effectively, a modified PCIe slot allowing for performance comparable to an AGP 4x/8x slot, [11] but with limited support of AGP cards. It is, effectively, a modified PCI slot with no direct interconnection with the CPU or memory, and thus slower even compared to an AGP 1x slot.