How does DDR4 compare to DDR3 when it comes to gaming? My knowledge so far is that you only need about 1866Mhz DDR3 at say CL9 to optimise gaming performance, is DDR4 really gonna make much difference beyond that, and don't the timings need to be tighter, they look really loose for DDR4 in comparison to DDR3?

I just don't understand why DDR4 memory comes in such huge 128GB capacity. Is it to make DDR4 future proof? It's obviously aimed for desktop consumers. We have 4 or 8GB DDR3 sticks and doing just fine with 8 or 16GB total memory. edit: I got it wrong it's not 128GB on single stick, it's 16GB * 8 sticks of RAM. but still... who on earth with right mind needs that much memory on single consumer PC?

Higher speed rates balance the need for tighter timings, 1866c9 is worse then 2400c10,same goes for DDR4 but have a look here to see some differences on several benchmarks. Differences are small but there are.. http://www.anandtech.com/show/8959/ddr4-haswell-e-scaling-review-2133-to-3200-with-gskill-corsair-adata-and-crucial/8

Higher speed rates balance the need for tighter timings, 1866c9 is worse then 2400c10,same goes for DDR4 but have a look here to see some differences on several benchmarks. Differences are small but there are.. http://www.anandtech.com/show/8959/ddr4-haswell-e-scaling-review-2133-to-3200-with-gskill-corsair-adata-and-crucial/8

Thanks for link, from that article there are plusses & also minuses in performance when comparing DDR3 and DDR4 - there's really no difference overall. Some game perform better with DDR3, others better with DDR4. Not worth getting DDR4 at the moment.