Compaq SR5703WM motherboard upgrade?

[Swordfish2]

Specs:
http://support.hp.com/us-en/product/Compaq-Presario-SR5000-Desktop-PC-series/3823953/model/3875749/document/c01237548/
Can I upgrade this computers motherboard to a better one? I currently have an AMD Athlon II 250 dual-core processor and DDR3 sticks laying around that I could use. I also want to keep the case and power supply. Budget is $50
Suggestions?

 

[Calvin7]

GIGABYTE GA-78LMT-USB3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128565