The motherboard has four memory slots/modules and each DIMM can hold a 4 GB RAM module, for a total of 16 GB. So you can put four sticks of RAM in it, the largest the sticks can be is 4 GB each. Here is the page for the motherboard, click on the "Specification" tab for more detail. Contrary to imomun, MSI says the board will only support 16 GB max.http://us.msi.com/product/mb/760GM-E51.html
It says the max CPU it will support is a Phenom II X6 (the six-core Thuban CPU). I'm not an expert on AMD CPUs, I haven't used them since Intel came out with the Core 2 Duo, but this seems like an older motherboard.
This page lists all of the CPUs that the motherboard will support. If the CPU is not on here, it won't work.http://us.msi.com/product/mb/760GM-E51.html#/?div=CPUSupport