On the bottom left of the NVIDIA Control Panel, simply click “System Information”, and in the new window look for “Resizable BAR” on the right. After you’ve updated all your components, and installed our Game Ready Driver, you can verify Resizable BAR is working on your system by opening the NVIDIA Control Panel. To enable Resizable BAR, check the system firmware (BIOS) settings to enable. Enabling this functionality can result in a performance improvement.

This is a mechanism that allows the PCIe device, such as a discrete graphics card, to negotiate the BAR size to optimize system resources.

Resizable BAR (Base Address Register) is a PCIe capability.NVIDIA Resizable BAR BIOS Update Information Page* I think the card, CPU and mobo need to be PCIE gen 4, so not the 1660s.NVIDIA Resizable BAR BIOS Update. I don't think it's supposed to work with your GPU. I was wondering would enabling Resizable Bar on my GTX 1660 Super do anything? as it's only for RTX 30 Cards.

The way AMD promoted and implemented Resizable BAR on Radeon 6000 GPUs, it required to be paired with a Ryzen 5000 series CPU and newer 500 series motherboard.

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