click here and download, install and run. Then in the program itself under Mainboard will be your motherboard.
If the above shows nothing then click here and download AIDA32 - Personal System Information, install and run. Click motherboard and motherboard again. Motherboard name is what you want.
If in doubt look at the motherboard itslef.
Then click here find your motherboad and you'll have your memory and prices.
What operating system are you using and what do do use your computer for?