TechPowerUp posted a review on the Intel X299 Platform Called a VRM Disaster by Overclocker der8auer
A quote from the article:
It would seem Intel's X299 platform is already having some teething issues, with user "der8auer" of overclocking fame claiming the platform is essentially a complete "VRM disaster." In the video in which these claims are made, he levies the blame to both Intel and the motherboard manufacturers "50/50." For Intel's part, he blames them for the short product launch which was pulled in from August to June, giving the motherboard manufacturers in der8auer's words "almost zero time for developing proper products."Intel X299 Platform Called a VRM Disaster by Overclocker der8auer @ TechPowerUp
In the video, der8auer elaborates to basically claim a completely lack of consistency among the quality of VRMs and their heatsinks in various manufacturers. In his first test, he takes a CPU that is known to do 5.0 GHz and on a Gigabyte Aorus branded mainboard found himself unable to even hit 4.6 GHz with dangerously high VRM temperatures. He goes on to blame the heatsinks on the VRMs, going so far to call the Gigabyte solution more of a "heat insulation" device than a cooler, as a simple small fan over the bare VRM array did many magnitudes better than a simple standard install with the stock VRM cooler attached. After an MSI-branded board did similar, it became clear this was not an isolated issue.