Around a month ago NVIDIA announced they would be bringing Resizable BAR support to their RTX 30 Series laptop parts as well as desktop RTX 30 Series and with their GeForce Game Ready Driver 461.72 they have done just that. But for now, it is a bit limited with only the mobile SKUs supported and a single desktop part, the RTX 3060.

In short Resizable BAR removes the tight restriction on the amount of data that can flow between the CPU and the GPU Memory and can sometimes allow for substantial performance increases. Resizable BAR grew in popularity and recognition when AMD implemented Smart Access Memory when you paired a Ryzen 5000 Series CPU and a 500 Series Chipset with an RX 6000 Series GPU. The biggest differentiator here between AMDs implementation and NVIDIAs is that the NVIDIA support for ReBAR (Resizable BAR) is that it's supported on many more platforms.

In fact, NVIDIA has extended support for ReBAR to even PCIe Gen 3.0 platforms by supporting Intel's 10th Gen Core Series CPUs with the 400 Series Chipsets that are already available. Interestingly enough on AMDs CPUs support only includes the Zen 3 Ryzen 5000 Series indicating that there's more to it indeed than just toggling a switch, but they do show support for even the 400 Series Chipset motherboards so long as the BIOS has support.

Test Setup

Test System