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Quick question, I notice guides recommend ddr3. Is there a benefit to going ddr4? Should I get the faster ddr3? What's the benefit of faster memory in terms of gaming? Or is that just for video editing abs such?

Should I get the titan or sli 2x 980's? Is that enough for 4k gaming? Or is 2 titans the min? What kinda power supply do i need for 2 sli'd 980's? What manufacterer is best for this?