Wonder if it's 1.1.8.0 I think perhaps the AGESA code and all it's modules or routines has a few issues that need to be worked out, newer chipset driver might help too for the software side of it after the bios is active such as the PCI Express driver unless the October 19th(?) release already includes this assuming the latest chipset software is installed on the system.Ībout how it looks like from my own Gigabyte bios though the BAR setting isn't there as I don't have a 5000 series Ryzen CPU.Ĭlick to expand.Yep the settings are in the BIOS, and on my ASUS BIOS, the settings are named the same thing (Above 4G Decoding and Re-Size BAR Support). Wouldn't you need to enable these features in the bios and possibly whatever is in AMD 20.11.2 itself?īios should be something like this, guessing setting BAR to enabled would also set 4G to enabled whereas auto might leave it disabled it 4G is disabled.īios could have changed something though or the defaults could for whatever reason be enabled by default but I was under the impression SAM itself needed a bit to actually activate it.ĭriver wise I'm not sure if there's a toggle or if it just works if the criteria is met (CSM disabled being needed as well?) nor if older GPU's are supported or not.ĮDIT: Yep bios settings and 20.11.2 and other than 4G and BAR the compatibility support module (CSM) has to be disabled and all of that need to be set up for it to work, depending on hardware Re-Size BAR Support might not even show up in the bios. ASUS PRIME X470-PRO motherboard (5806 beta BIOS).Dota 2 with Vulkan had about 10 FPS (DX11 is about 80-90).Oculus Link doesn't work (flickers white upon starting).A game using DXVK (AoE2DE) flickers a corrupted white screen.The VRAM usage reported by Radeon Software's metrics is "Infinity" ( screenshot).With a RX 580, I noticed the following issues under Windows: I have an ASUS PRIME X470-PRO motherboard that got such a BIOS. Recently some Ryzen motherboard vendors released beta BIOS files (notably for older chipsets like X470) that adds support for Smart Access Memory (SAM), or specifically Re-sizeable BAR support. I can confirm Resizable BAR working fine with my 2700X, on an ASUS PRIME X470-PRO motherboard with 5833 Beta BIOS (Jan 15, 2021), and RX 580 with 21.1.1 Adrenaline drivers on Windows 10 20H2 as of 1. This is only applicable from the Radeon Control Panel (Windows Task Manager and GPU-Z will report a VRAM number regardless of the driver not supporting the option). If VRAM is "Infinity", the driver doesn't support Re-sizable BAR. The quickest way to test if your driver works or not on Windows is to enable Resizable BAR in BIOS/firmware options, open Radeon Control Panel -> Performance -> Metrics. On Linux, it seems to work fine on kernels 5.9 and 5.10 (openSUSE TW). With a RX 580 (Polaris) and 2700X (Zen+) on Windows 10, Adrenaline driver 20.12.1 works fine, whereas Enterprise driver 20.Q4 doesn't work (my report below is with the unsupported Adrenaline 20.11.1 drivers). Re-sizable BAR causes broken VRAM reporting and generally breaks games (low performance or start-up crash) with non-DX11 graphics APIs (DX9, DX12, Vulkan) with drivers that don't support it. Edit: The graphics driver version used matters.
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