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Resizable BAR support for X299
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Certifiedlover6 View Drop Down
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Joined: 20 Feb 2026
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Certifiedlover6 Quote  Post ReplyReply Direct Link To This Post Topic: Resizable BAR support for X299
    Posted: 24 Feb 2026 at 10:35pm
I have successfully patched the latest bios (1.50) with the rebar enabled on the x299 steel legend, for some strange reason asrock removed the C.A.M feature from the latest bios but had it present in the 1.30g beta version, i do not recommend installing the beta update its very unstable and it keeps resetting itself on every boot. if anyone is interested in modding the bios feel free to reply to this message, thanks
cl6
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Points: 35 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ThunderKeg Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2024 at 7:35pm
Hi AsRock Team
May you please create a bios update for the the X299M Extreme4?
For some reason the X299 Extreme4 has all the updates while the "M" Version
is still at Bios Ver.1.50

A lot still use the HDET platform from intel since there is no information
about any new CPUS in the near future.


X299 Extreme4 (Has Newer Bios with Rebar) https://www.asrock.com/MB/Intel/X299%20Extreme4/index.asp#BIOS


X299M Extreme4 (No Rebar Bios)
https://www.asrock.com/MB/Intel/X299M%20Extreme4/index.asp#BIOS

Regards,
Bill Ecrofeg
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Points: 30 		Post Options Post Options   Thanks (0) Thanks(0)   Quote namitazop Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2022 at 6:54pm
My understanding was that 'Fast Boot' didn't use CSM, and since 'Fast Boot' hides the CSM option, it cannot be disabled.

Edited by Xaltar - Yesterday at 12:18am
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namitazop View Drop Down
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I would like bios for x299 Taichi to
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Playman325 View Drop Down
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Points: 65 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Playman325 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Nov 2022 at 11:51pm
I was just wondering why the extreme4 variant didn?™t get this but every other variant did get it, can anyone tell me the status of the extreme4 version getting it? I really need it before my new graphics card comes in.
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Points: 60 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Milkman Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2022 at 3:14am
No feedback from mods, ASrock support, or other users on x299 Taichi + BIOS version 2.50B used with nvidia 3080 GPUs + resizable BAR? Should I send an email to support? I wont bother with this, if this has been abandoned.
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Milkman View Drop Down
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Points: 60 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Milkman Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2022 at 5:37am
I note that the downloads section for the ASrock Taichi x299 now has a new BETA BIOS for the CAM function -- 2.50B. I have read this forum, and I've downloaded the BIOS update, but I wanted to ask -- has anybody tried the 2.50B BIOS for CAM / resizable BAR for Nvidia 3080 series GPUs?

I have read that some have had issues after trying the last CAM BIOS versions (1.90B, P2.00B), but I don't see any feedback from 2.50B. I want to install and test this, but will not if there has not been testing done for the 3080 series GPUs.
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Originally posted by arcam007 arcam007 wrote:

When can wa got an Asrock X299 Taichi XE BIOS to enable the RTX3090 "NVIDIA Resizable BAR" function. Where can i found it, please ?



https://asrock.com/MB/Intel/X299%20Taichi%20XE/index.asp#BIOS

1.90B at the bottom under 'Beta BIOS'.
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Points: 33 		Post Options Post Options   Thanks (0) Thanks(0)   Quote arcam007 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2021 at 1:40pm
When can wa got an Asrock X299 Taichi XE BIOS to enable the RTX3090 "NVIDIA Resizable BAR" function. Where can i found it, please ?
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Points: 33 		Post Options Post Options   Thanks (0) Thanks(0)   Quote arcam007 Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep 2021 at 10:59pm
I'm looking for an Asrock X299 Taichi XE BIOS to enable the RTX3090 "NVIDIA Resizable BAR" function. Where can i found it, please ?
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