So, as the title says, where I'm living I could get the G.Skill Ripjaws-X (2x4GB) DDR3-2400 for about $10 cheaper than the Corsair Vengeance Pro (2x4GB) DDR3-1600. The thing is I'm not sure if I should get the cheaper and faster one but operates at 1.65v or the other which operates at the recommended 1.5v. Is it safe to choose the former? I'm planning to use it with the i5-4690