Ive been overclocking my cpu for a while now but struggle to get passed a certain speed. Ive got a P4a, PC100 and an Asus P4B. I can overclock with bios or jumpers. If I use the jumpers I can change the fsbci ratio, but I cant up the core voltage. If I use bios I can change the vcore, fsb, fsb:mem ratio fsb in 1mhz. I use the bios to overclock as I need to increase the vcore to 1.55-1.6v to get passed 110 fsb. I get to 120 (2.4ghz) fine but stability slowly decreases untill I reach 127mhz (2540mhz) where it wont pass post. So what I do is get some pc133 and start at 120mhz. But I have the same trouble with stability. Kinda telling me it isnt my RAM failing me. Id check the fsbci ratio next but cant because I need to use the jumpers to do so, but cant get passed 110mhz because of the core voltage. (How safe is the voltage fix? You know when you wrap wire round specific pins? I try most things but this seems dodgy.) So im stuck at about 122mhz fsb (stable). Its not the ram cos PC133 @122 doesnt help. Its not the voltage Im confident its not the CPU. It quite often reaches 2.6 (133 fsb) Its not the board (most max at 142mhz) so it leaves what? The pci port? Does anyone know at what speeds the pci and agp ports max out at? If its safe Ill do that voltage fix and use the jumpers, giving me a max fsb of 133, (2667mhz cpu). Or am I barking up the wrong tree? Could it be the cpu? The temp is low.... usually say 50c @ 2.5 and about 1.65v. Cheers dudes. I know I have an nice overclock already but the RAM can go further (especially when I havent even started to use the pc133), the cpu is a great overclocker, as is the board. Like I said.... Im stuck!