I have a computer that I built several years ago and I am looking to add more ram but I cannot find the original memory(G.Skill - Ripjaws X series 8GB (2 x 4gb) DDR3-2133 240-pin DIMM). The motherboard is a Gigabyte - G1.sniper H6 ATX LGA1150 and the CPU is a Intel Core i5-4670 3.40GHz, 3400...