This new record was set at the Kingston HyperX OC Takeover World Finals where the team used a Z97X-SOC FORCE LN2 motherboard. Humorously, but not without reason, the overclockers also used oscilloscopes to demonstrate the true frequency of the memory. Given that there are reports going around that it may be possible to post false frequencies to HWBOT, the team felt that this was the only way to truly demonstrate that they set a world record. Their efforts certainly deserve some admiration. (Don't mind the blue screen of death at the end of the video below.)
Of course, we can't help but question the practical uses of overclocks such as this, but it does tell you that these high-end overclocking motherboards and memory components are built to sustain impressive clocks. You do need liquid nitrogen for cooling to be able to achieve this. Beyond having a company sponsor all the required hardware, you'll also need a ton of patience and skill.
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Overclocking is one of the motivational forces behind companies to make better products which will eventually work it's way down to the mainstream.
Everyone on TH knows they just cherry pick the best parts and have professional over clockers with LN hit these marks. It is largely unattainable by the average consumer to achieve this. But what about people who really don't know much about components, they will just assume that GIGABYTE is the best.
Its like a motorcycle I bought, the pictures for the ad had the rider doing wheelies. But in fine little print it said not to do this that it could damage your motor. It is IMHO misleading.
DDR4 should go up to 4266 but it could also be like DDR3 which has surpassed its expected top end speed. Plus DDR4 will be hitting later this year with Haswell-E and probably Skylake at the latest for mainstream if not Broadwell so it is not too far off.
All DRAM interface generations have seen one or two speed grades beyond the highest standard speed grade in enthusiast kits. DDR3 is a bit odd in that regard with 4-5 pseudo-standard grades beyond JEDEC spec. DDR4 might not repeat that.
And toss DDR3 in there; there's plenty of non-DDR3 that can go way above that. GDDR5 etc.