How much cpu can a p4m900 se motherboard handle?

i have a phoenix technologies p4m900 m7 se motherboard and want to know how much cpu it can handle. i need to change the cpu and want to add as much as possible without killing it.How much cpu can a p4m900 se motherboard handle?Any P4 CPU, you could possibly get a dual core to work, but there would definatly be a bios flash needed and still not be 100% sure until you try to power it up as to wheather it will work...