G.SKILL F4-4000C19D-32GTZSW, 32GB (16GBx2), Dual Channel Kit, Speed 4000MHz, 1.35V, Unbuffered, Non-ECC. Building on the strong success of G.SKILL Trident series, Trident Z series represents one of the world’s highest performance DDR4 memory designed for overclocking enthusiasts and extreme gamers.