Install CPU-Z. Your motherboard can be identified in the Mainboard tab.http://www.cpuid.com/softwares/cpu-z.html
There is also Speccy:http://www.piriform.com/speccy
Both will give you some system info. The system you have now is pretty capable, upgrading to a new CPU/motherboard/memory may not be worth the hassle and expense, to be perfectly honest.