The short and dirty of it is to go into your BIOS when you boot the PC up and do it yourself. Change the multiplier (or in your case probably the ratio) and if needed the front side bus to get it to just the right frequency you need. Tho, if you increase the FSB too much you'll be OCing the CPU and might need to up the voltages a bit.
The only thing that u need to do is enter to the BIOS and set all the specifications of ur RAM manually in the BIOS.
sorry.. my other ram is dead so i brought it back to the supplier to change it...
but i tried change the timings as said on the box but it still reads as 401mhz its really wierd.. do i need to change the fsb?