Yes, and it should never cause any problems.
Sure. It might not work but hey, you could put it in there somewhere.
yes it is possible to use DDR800 on DDR667 motherboard. But to be certain please check you motherboard spec.
DDR or SDRAM
Windows XP doesn't directly determine what type of memory can be used; it depends on the motherboard. If the motherboard is compatible with Windows XP and the motherboard supports this memory module, then you can use it with Windows XP.
What memory your motherboard can use will depend entirely on your motherboard. There is no way for someone to answer a generic question like this.I can add a personal note that I did upgrade my dad's laptop to contain one 1GB stick as well as the 512MB it came with. Of course, I have no idea what motherboard it has (or even what manufacturer it is).
cpu
Chipset and CPU define the type of memory.
It depends on the motherboard. If you can find out what type of motherboard you have, you can look up what type of memory and how much of it you can install into the memory banks. Keep in mind that the operating system that you have may limit how much of the installed memory you can actually use.
yes, you can use the motherboard with another Processor and add the ram on it and everything else
sure; CPU used to memory for processing data. it use mother board cache memory and it also use ram memory.
I think it depends on the motherboard.
cpu
The Accellerated Graphics Port card uses memory completely separate from the motherboard memory. They don't mix. Make sure you use the memory that the AGP card nees in the AGP card, and memory that the motheroboard needs in the motherboard. If you do that, everything will be ok.