Resizable BAR (Base Address Register), the technology behind AMD’s Smart Access Memory (SAM), isn’t exclusive to Ryzen owners anymore. Asus has released an entire wave of new firmwares for various Z490 motherboards that enable the Resizable BAR feature.
The firmware, which sports the 1002 version number, is fresh out of the oven as Asus evidently uploaded it just yesterday. The firmware is currently in the beta stage so there might be some bugs here and there. It also lacks a detailed description of the changes. We can, however, confirm that the 1003 firmware effectively brings support for Resizable BAR, as evidenced by the newly added “Above 4G Decoding” and “Re-Size BAR Support” options in our ROG Maximus XII Apex motherboard’s BIOS.
Read more @ Tom’s Hardware