Well, you could just increase the clock, but it doesn't really gain you anything. G.Skill already has the F4-4800C18D-16GTRS which runs at 4800Mhz. Is it fast?

Well, you could just increase the clock, but it doesn't really gain you anything. G.Skill already has the F4-4800C18D-16GTRS which runs at 4800Mhz. Is it fast? Not really. The F4-3800C14D-16GTZN running at 3800Mhz is actually faster in practice because you're limited by the memory module's latency. Increasing the clock just makes it a lot harder for motherboard and CPU manufacturers to support those speeds, but on its own it doesn't really gain you a lot of speed.