I'm trying to enable Resizable BAR (ReBAR) on my setup, which includes an AMD Ryzen 5 2600 CPU, a Gigabyte B450M Gaming motherboard, and an Intel Arc B570 GPU. I've just updated my system with a new 750W PSU and fresh Windows 11 installation. Despite these upgrades, I'm struggling with low GPU performance in games like Sekiro, where the frame rate drops dramatically. I've checked that the CPU and GPU usage isn't maxed out, and a bottleneck calculator suggests there shouldn't be any issues. However, when I look at the Intel Graphics Software, it indicates ReBAR is disabled or unsupported. I heard that B450M motherboards should support ReBAR, but after updating the BIOS to the latest version, I can't find any option for enabling it in the BIOS menus. Any advice on why this might be happening or how to enable ReBAR would be greatly appreciated!
3 Answers
From what I know, to get ReBAR working, you typically need a Ryzen 3000 or 5000 series CPU. With your Ryzen 5 2600, it’s likely a bottleneck for the GPU performance you're experiencing. Upgrading to at least a Ryzen 5600 could help, especially since the Intel Arc GPUs tend to have higher CPU overhead. Also, while it seems like you should have the option for ReBAR in your BIOS, not all motherboards effectively support it, even if they have the feature listed.
Actually, I managed to get ReBAR functioning perfectly fine with my Ryzen 2700X, so it’s not just limited to the latest CPUs. Just make sure your drivers are up to date, as drivers can significantly affect functionality. And don't forget that ARC GPUs require ReBAR to reach optimal performance, so getting it enabled is critical for your gaming experience!
First, make sure that CSM support is turned off in the boot settings. This step is often crucial for enabling Resizable BAR. If turning off CSM causes issues with booting into Windows, you'll need to switch your installation from MBR to GPT/UEFI. Microsoft has a guide on how to do that. Once CSM is off, check if you can enable Above 4G Decoding in the BIOS. If ReBAR still doesn’t show up, it might be that your motherboard doesn't support it without further modifications.
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