r/overclocking - for those who like to push their chips a little harder

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X99-S Bios Mod - ReBar Enabled (zerobytes.monster)

submitted 1 day ago by [email protected] to c/[email protected]

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The original post: /r/overclocking by /u/KondorMAC1 on 2025-06-08 11:01:19.

Hi All.

This is my first reddit post ever!

Anyhow. Regardless to the hate I am still rocking X99 haswell hardware because I love it!

For anyone who is interested. I managed to enable ReBar on the Asus X99-S motherboard and thought I would share the Bios file should you want to use it. You will need to set the Rebar size using RebarState (Github).

I hope someone finds this of use. Has made significant gains on my RX7600 and I am not having any issues with VRAM saturation on any of the games I play (Mostly AAA titles).

See attached. Is still Aptios Signed so can be flashed with USB Flashback. :)

This board has a 16gb limit. So I am set to 8gb as my card is 8gb.

Flash is successful with no issues. CSM needs to be disabled, and Enable 4G Encoding Enabled. Secure boot can be left alone.

https://drive.google.com/drive/folders/1uCIAk44SbO3dvqmHnc4zNCzuspo_jKqq?usp=sharing

https://preview.redd.it/o4tm0qj5fp5f1.jpg?width=1827&format=pjpg&auto=webp&s=68a1c65cea695a808c754bf52e23ae99817d736d

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