Yeahhh... you guys need to make a new thread for stuff like this~!
Listing the Mobo type, RAM, all the components, because each one acts differently than the last!
You need to place the memory in linked mode, and then sync mode. That will make the RAM stay at double the front side bus. So you would need a 400 FSB to get 800 Mhz from it, and it will only go up in sync with the FSB.
And there are LOTS of little things you may need to change in the mother board BIOS.
I dont know what Moron is spreadint the ol' "Change the FSB, add voltage and there you are!" because while it may work on a few mobos, it will not work on that many of them, heheeh!