AMD Ryzen 9 7945HX3D—the first laptop processor to sport the company's excellent 3D V-Cache technology. But why is adding some extra cache to that already impressive chip important, and why would you want it in your gaming CPU? The basic answer is that this is how every manufacturer is squeezing some extra performance out of its hardware in an age where it's getting harder and harder to run silicon any faster. Do they love a little more cache? You know where to go…