Sorry leper, but you can't change that multiplier. How far you can overclock depends a lot on luck with your processor. I think all 845pe motherboards were designed with 200mhz fsb in mind. You are locked into an 18x multiplier which means at 200mhz fsb you would have a 3.6ghz chip (18 x 200mhz). Get it, your cpu speed solely depends on what you set the fsb to since you can't change your multiplier. I'd make sure your memory is set to be synchronous (ie 1:1 ratio) and slowly raise your fsb ~10mhz at a time. In between boots, run superpi 32m or prime95 for a while to stress test. If either program errors then you may need to try a little higher Vcore. I wouldn't use more 110% of the default voltage (if default is 1.4V, don't go above 1.54V). Make sure to watch your temps as well with a utility from your motherboard manufacturer or something like MBM5 or smart guardian. I'm not sure how hot is TOO hot for a prescott, but check your temps at default while running prime95 and use that as a guide.
Good luck.
Facebook
Twitter