SumTingWong
1) What do you mean by "handle"? A regular load should not really heat anything, LinX is not a regular load at all. 3700X without manual OC, without Linx-like load should be OK on almost any board, and although ours is decent at best when it comes to VRM, it should be able to handle it, unless there's no airflow in your case at all.
2) Look #1. Under "usual" circumstances (regular home/office usage) I doubt 3900X can load VRM much enough for it to overheat, the only complication might be that older fewer-phase VRMs may not be optimal in terms of voltage quality/stability, that's why if you really care about VRM quality - go for top-tier motherboards like Crosshair or AsRock Taichi. Personally I didn't buy the Taichi only because I heard of its bad RAM OC, in the end jokes on me - X470-F can't even start when I set my 2 B-die-based sticks to 3466 MHz (1usmus dram calc - Safe preset), so I feel like a complete fool.
3) Without a custom thermal sensor manually placed somewhere in the VRM area you can not check its temp, and I doubt anybody cares about it, it works somehow and that's it. If you care about such things - better buy a Crosshair VI at least, it's better than our sh... in every possible way, personally I would not recommend anybody to buy X470-F, because RAM OC is horrible (with the best-overclocking B-die sticks!!!) with it, because BIOS updates are 1-1.5 months late for us, basically there's nothing good about this motherboard, and after you check out its price you should keep away from it, it is not worth the price.
