Your motherboard will support other processors. Check the model number on the manufacturer's web page for info. Some things to remember: the power supply may limit your choice of replacement processors, ie duo-core may not be an option even if the MOBO supports duo-core if the power supply hasn't got the right connectors and watts; some processors run hot and cooling may become an issue; and not knowing the age of your MOBO, if its older, your only supply of replacement processors might be the used market.
Get info and consider your options.