This is where you read about your motherboard. There are several different Gigabyte boards with intel i810 chipsets - you need to find the correct Gigabyte number in order to find which processors will be compatible with your board.
As far as graphics are concerned, the i810 chipset includes an on-baord graphics controller. If you want to add a better controller, you first need to find whether your board has an AGP card slot (only for graphics cards). Otherwise you will be limited to PCI cards, which are very much less plentiful. Also you need to read the board manula to find out if, and how, to disable the built-in graphics.
This thread is now locked and can not be replied to.