SL7CH and P4M900-M4
I have motherboard P4M900-M4 by Biostar. Is the SL7CH (BX80532PG3400F or RK80532PG0962M) (Intel Pentium 4 3.4 GHz) compatible?
Thats your CPU, its a nice one I used to have it. Its pretty fast for how old it is.
Thats you mobos CPU support list. Unfortunatley it does not list the Pentium 4 3.4GHz Extreme Edition as compatable. Now it may work but in most cases with Intel based CPUs, it will not work. You can however get a Pentium 4 3.sGHz and it will work. Or get a mobo with a newer chipset, which for S478 is not very easy.