Motherboard and CPU Upgrade..

[Chas3down]

I am currently using the motherboard - N-Alvorix-RS880-uATX

My computer is the - HP Pavilion Elite HPE-400y Desktop
Upgrade my GPU to GTX 560Ti and my power supply

How can I find what possible CPUs fit my motherboard?
Also, because my motherboard came with my AMD processor in my HP, does that mean intil is not compatable?

 

[Chas3down]

Are any AM3 processors comparable?
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02560084

i am in interested in the - AMD FX-8150 Eight-Core