AMD’s Ryzen X3D processors, with their special sauce V-Cache for boosting gaming performance, are all the rage in the custom-built desktop space. But what if you want some of that power in a machine that fits in a backpack? Then you might want to check out the MSI Titan 18 Pro, packing a Ryzen 9 7945HX3D processor. This isn’t the first laptop to be equipped with an AMD X3D processor—that honor goes to the Asus ROG Strix Scar 17 from last year with the same chip—but as a close second, the Titan 18 Pro is compelling. In addition to that 16-core, 32-thread monster CPU, it’s packing an Nvidia RTX …