If you have an 800FSB and one bank of DDR400 memory, then your memory performance will be no better than with a cheaper 400 or 533FSB. If you have 800FSB and two banks of DDR400 memory, then you can saturate FSB and your memory still keeps up.

Interesting. Can you clarify this more? Do you mean "bank" or do you mean "chip"?

I've got two 512-meg chips on a "3200" board with the CPU running at 800mhz FSB.

There are four slots for RAM chips on the board, arranged in two pairs, like this:

----------------
----------------

----------------
----------------

Is each slot a bank, or is each pair a bank? In other words, Right now, the chips are installed thus:

|========|
|========|

----------------
----------------

If each pair was a bank instead of each slot being a bank, would I get better performance if I plugged them in thus?:

|========|
----------------

|========|
----------------