I just bought the motherboard listed in the message title and need to know if it works with compatible with G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL
I plan to use Windows 7 64 bit operating system.
More about :gigabyte p55 usb3 lga intel p55 usb3 atx intel motherboard
Your motherboard has DDR3 memory slots that support up to 4GB each (for 16GB total), so it will work fine. You should know that the board doesn't support 1600MHz, so it will run at 1333Mhz.
The memory is not on the QVL (Qualified Vendors List), but that doesn't mean it won't work, just that it hasn't been tested & proven to work. These lists are usually small, and personally I never pay attention to them. There were only two 4GB modules on the whole list, what a selection!
If you are interested in checking out the QVL then click the link below.