|1st of all, you need to know a few things:|
400MHz FSB runs at 100MHz frequency.
533MHz FSB runs at 133MHz frequency.
DDR266 RAM runs at 133MHz frequency.
DDR333 RAM runs at 166MHz frequency.
DDR400 RAM runs at 200MHz frequency.
If you're running a P4 at 400MHz FSB, the correct RAM speed for best performance is DDR266. If you run a P4 at 533MHz FSB, the correct RAM speed is DDR333. These are the settings your board will default to...it's all explained in the manual. See table 7 on page 23:
Since you have a 2.8 GHz/533MHz FSB CPU (21 x 133MHz) but appear to be running it at 400MHz FSB, the CPU speed should be 2.1GHz (21 x 100MHz), not 2.0GHz. I'm not familiar with how your board works but what I think you need to do to get it to run at the correct speed is shutdown the system, then move the BIOS block jumper to the CONFIGURE position, then bootup. After it reconfigures, shutdown & move the jumper back to the NORMAL position. See page 66 of the manual, or this: