But is this really a problem? Studies have been made about PCIe bandwidth scaling for GPUs, with TechPowerUp’s most recent in-depth foray conducted with an NVIDIA RTX 2080 Ti. The results shouldn’t be too surprising, as we are talking low single-digit percentages even with that mighty graphics card. And by low, I mean up to 3%.
Having just 8 total lanes of PCI Express 3.0 is not, after all, much of a factor in implementing a high-end graphics card in a laptop. Even so, it is a bit disappointing to see just x8 lanes of PCI Express 3.0 available to a discrete GPU in these systems, considering how impressive the CPU performance is – if indeed this lane issue has anything to do with the lack of available Ryzen 4000H-based machines with top-end graphics cards.
Thermals and power delivery are always the biggest hurdles with dGPUs in notebook designs, but advanced implementation and management techniques – not to mention big gaming laptops with powerful coolers and massive power bricks – exist to mitigate these. But for whatever reason we still don’t have a single Ryzen 4000 Series notebook option with a GPU higher than an RTX 2060.