|I assume you're asking about a Dell? Normally, they don't provide overclocking options via the BIOS. Which overclock program are you using? You would actually get better performance out of your system by adding more RAM, disabling the onboard video & installing an actual video card. Overclocking will yield little or no "real feel" improvement due to the limitations of the software.|
The problem with software overclocking is that you have no control of the other buses connected to the FSB. In other words, as you increase the FSB, the PCI, AGP, PCI-express, memory buses all overclock along with it.
I'll hit you with a little math. The PCI bus runs at 33.33MHz by default. The safe max is generally considered to be 37.5MHz. So with a CPU that runs at 200MHz frequency (800MHz FSB), the PCI divisor is 6 (200/6 = 33.33). Working the other way to determine the safe max CPU frequency, just multiply 37.5MHz x 6 to get 225MHz. If you can raise the freq that high without stability issues, the CPU will run at 3.375GHz (15 x 225MHz). However, you also need to take the RAM into consideration because the memory bus will also increase. If you have DDR400, the CPU:DRAM freq ratio is 1:1, so the RAM freq will increase in step with the CPU freq. 225MHz *may* be too much for DDR400 to handle so it's very possible you won't be able to go much higher than 215MHz. If you have DDR2-533, the ratio is 3:4, therefore the RAM freq will be 1.333x the CPU freq. 225MHz x 1.333 = 300MHz. That *may* be too much for DDR2-533 to handle.
The bottomline is, it's all trial & error.