More precisely, 8Gbit DDR4 which is beginning to reach crossover now. There is also 8Gbit DDR3 that is less popular (and I think only made by Micron and Intelli

More precisely, 8Gbit DDR4 which is beginning to reach crossover now. There is also 8Gbit DDR3 that is less popular (and I think only made by Micron and Intelligent Memory), but Broadwell supports it for example.