After receipt of this set of RAM, we found our 7700K test system unable to handle the raw speed of what we are about to show off here today. Along with the need to run another faster set, which we will be showing off soon enough, we were faced with the obligation to update the test system. Doing so meant lots of testing, breaking out a few of the older kits we have, and seeing what the new system is capable of doing. With what we have already seen, nothing is holding back our ASRock X299 OCF and the i7 7740X CPU we are using now, and we can finally deliver the reviews of DDR4 with speeds higher than 3800MHz. That all brings us to what we have for you today. To help us find the issues with our previous system, we asked Corsair for some of their Vengeance LPX kits, and to break our last barrier, we asked them for a set with 4000MHz. TO be more specific, we are looking at the CMK16GX4M2E4000C19R kit, with timings of 19-23-23-45. On the face of it, we do know of tighter timed memory at this speed, but with Corsair opting for one of the best ICs on the planet to populate these sticks, with little effort involved, we have a distinct feeling that Corsair has let some meat on the bone. ...