| Resizable Bar Support to Z370 series?
 
 Printed From: ASRock.com
 Category:  Technical Support
 Forum Name:  Intel Motherboards
 Forum Description:  Question about ASRock Intel Motherboards
 URL: https://forum.asrock.com/forum_posts.asp?TID=17446
 Printed Date: 29 Oct 2025 at 7:14am
 Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
 
 
 Topic: Resizable Bar Support to Z370 series?
 Posted By: amon.akira
 Subject: Resizable Bar Support to Z370 series?
 Date Posted: 08 Dec 2020 at 2:06am
 
 
        
          | Asrock want give yet support to Z370 users to enable Resizable Bar in near future? thx in advance |  
 
 Replies:
 Posted By: daicon
 Date Posted: 15 Jan 2021 at 9:12pm
 
 
        
          | upppp 
 
 plezz suppport for z370 with nvidia??
 |  
 Posted By: marcosg
 Date Posted: 31 Jan 2021 at 4:42pm
 
 
        
          | Yes, there are a LOT of us that have this. MSI has already added support. 
 https://www.msi.com/news/detail/010ad17a3b1868e7e219a11274738ea7
 |  
 Posted By: amon.akira
 Date Posted: 10 Feb 2021 at 8:50pm
 
 
        
          | |  marcosg wrote: 
 Yes, there are a LOT of us that have this. MSI has already added support.
 
 https://www.msi.com/news/detail/010ad17a3b1868e7e219a11274738ea7
 | 
 
 i see h370 on msi page...anyway someone can answer us? will get BAR support on z370 by Asrock?
 |  
 Posted By: Globespy
 Date Posted: 04 Mar 2021 at 3:59am
 
 
        
          | +1 - an answer would be nice, but not sure AsRock employees even read these forums. |  
 Posted By: ASRock_TSD
 Date Posted: 19 Mar 2021 at 6:43pm
 
 
        
          | Hi Amon.akira, 
 Thank you for your waiting.
 
 We plan to upload the BETA BIOS to support Resizable BAR for ALL Z370 models next week.
 
 You can find the BIOS on the BIOS support page, please stay tuned on our official site.
 
 To get Resizable BAR support, please make sure you are using the AMD RX6000 series or the NVIDIA 30 series with the vBIOS that support resizable BAR.
 
 All the best,
 ASRock TSD
 
 
 
 
 |  
 Posted By: cobrass2
 Date Posted: 21 Mar 2021 at 8:06am
 
 
        
          | That is great news! Thanks! |  
 Posted By: amon.akira
 Date Posted: 31 Mar 2021 at 4:39am
 
 
        
          | thanks alot, great support by Asrock! |  
 Posted By: voidtak1
 Date Posted: 31 Mar 2021 at 7:54am
 
 
        
          | the bios does not work properly It can only be activated by deactivating cmt uefi, and when activating it the screen goes black, please correct
 |  
 Posted By: voidtak1
 Date Posted: 31 Mar 2021 at 7:55am
 
 
        
          | the bios does not work properly It can only be activated by deactivating cmt uefi, and when activating it the screen goes black, please correct
 
 |  
 Posted By: amon.akira
 Date Posted: 31 Mar 2021 at 9:34am
 
 
        
          | i confirm bios dont work correctly Asrock z370 k6 gaming 4.20B (beta)
 3080 asus tuf with resizable bar bios flashed
 
 black screen if C.A.M. is enabled, need to reset bios
 
 CAM is available only if csm is disabled and memory encondig is enabled.
 |  
 Posted By: pdxv
 Date Posted: 31 Mar 2021 at 10:35am
 
 
        
          | Made an account just to say the same as above. 
 The BIOS is not working properly. After updating vBIOS and enabling 4G Decoding and CAM with CSM disable just results in a black screen, either requiring you reset CMOS or use a backup/2nd BIOS if your GPU has one to get a signal back and revert BIOS settings. It successfully loads into Windows with no signal on the monitor as I can see my RBG profile load on keyboard and headset.
 
 This only happened after the vBIOS update. I had all the settings enabled for the past week waiting for the vBIOS update with no issue. I also confirmed after disabling 4G Decoding/CAM and enabling CSM again that so that I could boot into Windows the vBIOS updated successfully ruling that out.
 
 Extreme4 Z370 BIOS Ver. [Beta] L4.21A/ 8700K / Boot SSD GPT
 |  
 Posted By: 27182
 Date Posted: 31 Mar 2021 at 6:26pm
 
 
        
          | Hello, I noticed that the beta BIOS is no longer available for download (for the Z370 Extreme4 at least).
 Could we have any info on the matter£
 Thanks
 |  
 Posted By: voidtak1
 Date Posted: 31 Mar 2021 at 6:55pm
 
 
        
          | please beta bios dont work correctly After updating vBIOS and enabling 4G Decoding and CAM with CSM disable just results in a black screen, either requiring you reset CMOS or use a backup/2nd BIOS if your GPU has one to get a signal back and revert BIOS settings. It successfully loads into Windows with no signal on the monitor as I can see my RBG profile load on keyboard and headset.
 
 This only happened after the vBIOS update. I had all the settings enabled for the past week waiting for the vBIOS update with no issue. I also confirmed after disabling 4G Decoding/CAM and enabling CSM again that so that I could boot into Windows the vBIOS updated successfully ruling that out.
 
 |  
 Posted By: pdxv
 Date Posted: 31 Mar 2021 at 7:23pm
 
 
        
          | |  27182 wrote: 
 Hello,
 I noticed that the beta BIOS is no longer available for download (for the Z370 Extreme4 at least).
 Could we have any info on the matter£
 Thanks
 | 
 
 Yup, seems they have pulled the beta for Z370 boards now. Hopefully that means a fix is in the works.
 |  
 Posted By: pdxv
 Date Posted: 01 Apr 2021 at 6:53pm
 
 
        
          | New BIOS beta versions for Z370 are out now |  
 Posted By: ASRock_TSD
 Date Posted: 01 Apr 2021 at 6:56pm
 
 
        
          | Hi All, 
 We uploaded the new BETA BIOS to enhance the CAM function for all Z370 models, please download the latest BIOS file from the motherboard download page.
 
 All the best,
 ASRock TSD
 
 |  
 Posted By: 27182
 Date Posted: 01 Apr 2021 at 9:33pm
 
 
        
          | Thanks, good to see great support from Asrock for these motherboards   |  
 Posted By: amon.akira
 Date Posted: 01 Apr 2021 at 10:11pm
 
 
        
          | 4.20c beta works fine here now (z370 k6 gaming). 
 thx for the support!
 |  
 Posted By: voidtak1
 Date Posted: 02 Apr 2021 at 4:07am
 
 
        
          | 68 / 5000
 Resultados de traducción
 where is the new beta bios£ I don't see the link in asrozk fatal1tyz370
 |  
 Posted By: voidtak1
 Date Posted: 02 Apr 2021 at 4:15am
 
 
        
          | |  ASRock_TSD wrote: 
 Hi All,
 
 We uploaded the new BETA BIOS to enhance the CAM function for all Z370 models, please download the latest BIOS file from the motherboard download page.
 
 All the best,
 ASRock TSD
 
 | 
 
 can't see the bios Fatal1ty Z370 Gaming-ITX/ac
 |  
 Posted By: amon.akira
 Date Posted: 02 Apr 2021 at 4:37am
 
 
        
          | |  voidtak1 wrote: 
 
 
 can't see the bios Fatal1ty Z370 Gaming-ITX/ac
 | 
 
 
 i can see it for your model, is below in beta bios section 4.31B
 |  
 Posted By: Bekhan24
 Date Posted: 03 Apr 2021 at 3:39am
 
 
        
          | I have a Z370 Extreme4 + 8700K, BIOS version 4.21B. How can I enable all options for the Resize Bar to work correctly£ |  
 Posted By: Bekhan24
 Date Posted: 03 Apr 2021 at 3:40am
 
 
        
          | |  ASRock_TSD wrote: 
 Hi All,
 
 We uploaded the new BETA BIOS to enhance the CAM function for all Z370 models, please download the latest BIOS file from the motherboard download page.
 
 All the best,
 ASRock TSD
 
 | 
 
 I have a Z370 Extreme4 + 8700K, BIOS version 4.21B. How can I enable all options for the Resize Bar to work correctly£
 |  
 Posted By: Bekhan24
 Date Posted: 03 Apr 2021 at 6:59am
 
 
        
          | |  ASRock_TSD wrote: 
 Hi All,
 
 We uploaded the new BETA BIOS to enhance the CAM function for all Z370 models, please download the latest BIOS file from the motherboard download page.
 
 All the best,
 ASRock TSD
 
 | 
 
 Where can I find the "C.A.M. (Clever Access Memory)" option in BIOS 4.21B Z370 Extreme4£
 |  
 Posted By: pooppiss
 Date Posted: 03 Apr 2021 at 2:04pm
 
 
        
          | you must disable CSM first then you will find it just below the above 4G decoding option. |  
 Posted By: Bekhan24
 Date Posted: 03 Apr 2021 at 6:20pm
 
 
        
          | but where is this CSM in BIOS£  tell me pls or send me a photo |  
 Posted By: Bekhan24
 Date Posted: 03 Apr 2021 at 7:13pm
 
 
        
          | |  Bekhan24 wrote: 
 but where is this CSM in BIOS£  tell me pls or send me a photo
 | 
 
 I found it! In the BOOT menu.
 |  
 Posted By: aufkrawall
 Date Posted: 05 Apr 2021 at 5:14am
 
 
        
          | Clever Access Memory does not work for me with B560 Pro4 mainboard and both bios 1.50 and 1.61, after saving bios settings it just loses display signal and the boot procedure doesn't continue. I then need to clear CMOS with power completely disconnected, otherwise I even need to remove the battery. Please fix this rather sooner than later!
 |  
 Posted By: Radical_53
 Date Posted: 06 Apr 2021 at 4:15am
 
 
        
          | Just flashed version 4.20C, resizable BAR is enabled. Great support, thanks alot! |  
 Posted By: ASRock_TSD
 Date Posted: 06 Apr 2021 at 6:56pm
 
 
        
          | |  aufkrawall wrote: 
 Clever Access Memory does not work for me with B560 Pro4 mainboard and both bios 1.50 and 1.61, after saving bios settings it just loses display signal and the boot procedure doesn't continue. I then need to clear CMOS with power completely disconnected, otherwise I even need to remove the battery.
 Please fix this rather sooner than later!
 | 
 Hi Aufkrawall,
 
 Thank you for your post.
 
 We are currently processing it, and we will contact you again if we have any new information.
 
 All the best,
 ASRock TSD
 
 |  
 Posted By: KaiUno76
 Date Posted: 12 Apr 2021 at 2:29am
 
 
        
          | Are you guys planning on a Z370 Taichi release for CAM as well? Can't seem to find it yet. |  
 Posted By: rodrigocrd
 Date Posted: 03 Jun 2021 at 11:46pm
 
 
        
          | Any chance for the final version be released or will be only beta? |  
 
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