Without overclocking my VRM 1 goes to 70 degrees max and VRM 2 63 degrees . But when I OC my GPU to 1100(1055 base) mhz and memory to 1600(1500 base). My VRM 1 goes to 120 degrees and my VRM 2 goes to 70 degrees . My gpu is a 390X Tri-X
The higher you overclock your CPU/APU and GPU the more power those components are going to draw, the hotter the power regulation components on the Motherboard are going to get, the only thing you can do is turn down the overclock or re-arrange case and fans for better air flow. Can you provide a pic of the case?
My GPU never gets over 72 degrees but that vrm module scares me 120 degrees is not good . I cannot provide a photo of my Nzxt phantom 410 , but I think the air flow is pretty good . When I play games like the Witcher 3 my cpu never gets over 57 degrees (stock speeds , cooler is a Cm 412s) and my gpu never gets above 70 degrees when OC'ed . I just noticed that the VRM gets way too hot .
VRM are voltage regulators, they are doing all the work before passing the power to your components connected to your motherboard, they are usually around your CPU socket on your motherboard, so if you want to keep your overclock you need to get more air moving around that area of the motherboard.