I had a 2x4GB DDR3 1600 G-Skill Ripjaws X for about 2 years unitl one of the DIMMs broke. To save money, I was wondering if I could just replace the broken DIMM with another GSkill Ripjaws X. the replacement would still be DDR3 1600, a 1x4GB model. I don't have the older RAM with me so I'm not...