Image: ASUS

ASUS has released new beta BIOSes that bring Resizable BAR (Base Address Register) support to some of its Z490 motherboards. This happens to be same technology behind AMD’s Smart Access Memory, which means that Intel users can leverage the full potential of a Radeon RX 6000 Series graphics card without a Ryzen 5000 Series processor or 500 Series motherboard.

The addition of Resizable BAR has been confirmed by Tom’s Hardware, which shared a screenshot of a ROG Maximus XII BIOS with “Above 4G Decoding” and “Re-Size BAR Support” options. Users can find the new settings under the Advanced panel after updating to the relevant firmware (version 1002).

According to a slide shared by ASUS PR guy Chris Wefers (via VideoCardz), enabling Resizable BAR on a ROG Maximus XII Hero/Intel Core i7-10700K/AMD Radeon RX 6800 XT configuration allowed for a 13.4 percent performance increase in Forza Horizon 4. This is similar to AMD’s own benchmarks, which alluded to an 11 percent increase with Smart Access Memory enabled.

Wefers noted that the new firmware is available for select Intel H470 and B460 motherboards as well. Users can search for the new BIOSes on ASUS’s support site.

Image: Tom’s Hardware

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  1. so … it would stand to reason that, if unencumbered by AMD themselves, any manufacturer could enable this feature on any AM4 motherboard?
  2. Yea I still don’t get why AMD isn’t giving this to previous generations of AMD Ryzen and Threadripper CPU’s.
  3. Same reason why Intel isn’t giving Optane support to older platforms, while those platforms were more than capable of making use of it.


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