|"says 2.288ghz... that's the only number i can find"|
That's the overclocked speed. I'm asking what the default speed is. If you have the X2 4000+ Windsor, the speed is 2.0GHz (10x multiplier)...if you have the X2 4000+ Brisbane, the speed is 2.1GHz (10.5x multiplier). The CPU multipler affects the RAM speed. You do realize that you should lower the RAM speed to 667Mhz, not 533MHz, right?
For example: if you have the Windsor & increase the CPU frequency to 240MHz, the RAM will run at 800MHz. But if you have the Brisbane & increase the CPU frequency to 240MHz, the RAM will only run at 754MHz. To get it to run at 800MHz again, you'd have to increase the CPU freq to approx 255MHz, but I doubt your system would boot with those settings.
To make it easy, I suggest you set the multiplier to 10x, the CPU frequency to 240MHz, the RAM to 667MHz, the HT freq to 800MHz, lock the PCIe at 100MHz & disable both Cool'n'Quiet & Spread Spectrum. And you *may* have to bump up the CPU voltage. The result will be the CPU at 2.40GHz, the RAM at 800MHz & the HT bus at 960MHz.