First of all learn to spell and format your question in a readable way.
Second of all there will be next to no difference (maybe 1 fps) going from a P35 board to P45 or X48, there should be a PCI-E x16 slot on your motherboard which will give you the full performance out of your HD4850.
And thirdly i dont think anyone responded to you due to your spelling and confusingly set out question and thread title.