{"id":821522,"date":"2026-11-02T07:56:14","date_gmt":"2026-11-02T07:56:14","guid":{"rendered":"https:\/\/www.newsbeep.com\/uk\/821522\/"},"modified":"2026-11-02T07:56:14","modified_gmt":"2026-11-02T07:56:14","slug":"resizable-bar-comes-to-haswell-motherboards-thanks-to-a-community-uefi-driver","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/uk\/821522\/","title":{"rendered":"Resizable BAR Comes to Haswell Motherboards Thanks to a Community UEFI Driver"},"content":{"rendered":"

Haswell owners finally have a way to get Resizable BAR running on Intel 8-series motherboards. As spotted by Haze on X<\/a>, a developer going by roschank has released reBART<\/a>, an open-source UEFI driver for Z87, H87, Q87, B85, Q85, and H81 boards. Back in 2020, it was reported<\/a> that Intel CPUs since Haswell support Resizable BAR, pending firmware updates from motherboard makers that never came for 8-series. The developer went digging after failing to get Above 4G Decoding working on their own B85 board, and found that Intel’s 8-series platform code skips mapping memory above 4 GB altogether, something both 7-series and 9-series firmware handle. Apparently, every board maker they checked inherited the same gap, so the 4G toggle some of these BIOSes expose likely does nothing.<\/p>\n

reBART lets the board boot normally and only kicks in right before the OS loads. At that point, it shifts the GPU’s memory window up past the 4 GB line and points the boot display at the new location too. Unlike ReBarUEFI<\/a>, it doesn’t need module patching, though a DSDT patch is still required. Newer builds added experimental support for Intel Arc cards and multi-GPU setups, which is important since Intel once told Arc buyers without ReBAR to stick with other vendors<\/a>. One user<\/a> reports an Arc A750 and an Arc B580 both working with an unlimited BAR size on a Gigabyte GA-Z87M-D3H under Ubuntu. Of course, going this route means flashing a modified BIOS, and at least one ASUS Z87-Plus owner<\/a> couldn’t get the board to boot after the DSDT patch. The developer hasn’t shared any performance numbers yet either.<\/p>\n

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