800mhz p3 256m pc-100 x3 slots 768m total
If you are moving your current processor into the upgraded motherboard, your current cooling fan does not need to be upgraded.
In some cases, yes. If the BIOS of the motherboard has the proper microcode updates to control the processor, and the FSB (front side bus) is at a high enough rate, you can install a Pentium III processor on the older board.
No, you should be able to go into your settings and turn off the onboard video card.
Your motherboard may need to be changed when your CPU is upgraded.
An upgrade is possible, but it's not an easy switch. The newer processor requires a specific chip set and socket that differs from the ones installed in most computers. Removing the motherboard may not be an option if you have a laptop, but a desktop could be rebuilt with a new motherboard and CPU to accomodate the new processor.
ram --- Wrong. RAM actually CAN be upgraded without touching the processor. L1, L2, and L3 cache are physically located INSIDE of the processor, so they obviously cannot be changed or upgraded without replacing the processor itself.
bios & cpu
Gigahertz are a measurement of how fast a processor operates. They can be "upgraded" in the sense that you can overclock a processor to get "more" of them, or you can install a better processor for the same effect.
If it has an Intel or G5 processor, then yes. If it has a G3 processor, then no. If it has a G4 processor, then it depends on the processor speed.
Some computers cannot be upgraded! But two common upgrades are buying memory(RAM) or getting a better processor.REMEMBER: Don't just go to your local hardware store and buy the first new processor/memory you see, you must check if it is compatible with your motherboard and any other hardware or OS's you have!
Allows graphics processor to easily upgraded
There are many green boards in a computer. I am guessing that you mean the biggest one, right in the center. That would be the motherboard, the main part of the whole computer. It decides everything about your computer: what kind of processor, RAM, and cables to use, and it also decides how much the computer can be upgraded. Everything plugs into the motherboard, basically, making it the central part of the computer.