how much FSB can the p4pe do with the latest bios ?

230 or more with a 800fsb cpu ?
and if i use a 800 fsb cpu .... can i still use my old 333 ram ?

The latest BIOS enabled support for 800FSB HT CPU's but that i845PE chipset will already be running on it's toes @200FSB so I wouldn't expect much more out of her. Yes you can still use your DDR333 RAM.