My motherboard can upgrade to a maximum of what CUP?

Main Board:i845G-W83627HF
model I now use the Celeron 2.0.Painful ~!
we recommend you to help me, that I would be more appropriate CUP The board would like to thank you ~
ah ..

Even the greatest support for the 3.0 version of the Lord together for a P4 2.8B
remember that it is 2.8B, is not a P4 2.8C, not the P4 2.8A.Is the best P4 2.4, support is the highest frequency of 2.8