That's a sweet setup and awesome with the rebates and discounts. Congrats!
The G620 is on the CPU compatibility list:
http://www.msi.com/product/mb/H61M-E33--B3-.html#/?div=CPUSupport
The G620 is on the CPU compatibility list:
http://www.msi.com/product/mb/H61M-E33--B3-.html#/?div=CPUSupport