Question Resizable BAR not working ?

[InTakeYT1]

Specs:
Ryzen 7 7700x
32GB 5600Mhz
Asus B650-A Gaming Wifi
Msi Gaming X trio 3090
I have followed the steps (CSM disabled, 4G encoding enabled, resize bar enabled) but on gpu-z it says resizeable bar hasn't been enabled in bios when it has. (everything else is "yes")
vbios is 94.2.26.8.52
bios is 0613

 

[Darkbreeze]

First thing I'd do is update the BIOS either to 0823 or 1001 (Beta version). You are on the original BIOS release and there have been several newer releases since then. You can update directly to 0823 or 1001.

However, resizable bar is not supported on AMD platforms (Although it DOES need to be enabled to support SAM). AMD platforms use Smart Access Memory (SAM). In order to use it you need a board with a minimum of Agesa code version 1.1.00 or newer. Even the most recent BIOS version for your board only supports Agesa code version 1.0.0.4 but I'd try updating to the latest BIOS version and try again. Otherwise, you may need to either wait for a BIOS release for your board that includes the newer Agesa code or get a different board that does.

https://www.amd.com/en/technologies/smart-access-memory

 

[InTakeYT1]

First thing I'd do is update the BIOS either to 0823 or 1001 (Beta version). You are on the original BIOS release and there have been several newer releases since then. You can update directly to 0823 or 1001.

However, resizable bar is not supported on AMD platforms (Although it DOES need to be enabled to support SAM). AMD platforms use Smart Access Memory (SAM). In order to use it you need a board with a minimum of Agesa code version 1.1.00 or newer. Even the most recent BIOS version for your board only supports Agesa code version 1.0.0.4 but I'd try updating to the latest BIOS version and try again. Otherwise, you may need to either wait for a BIOS release for your board that includes the newer Agesa code or get a different board that does.

https://www.amd.com/en/technologies/smart-access-memory

I thought SAM was for AMD cpu's and AMD Gpu's?

 

[Darkbreeze]

You're right. My bad. I could have sworn that you had an AMD graphics card but I guess it was just an AMD CPU.

Regardless, if you REALLY feel like you need to try it, update the BIOS and then try it. But if we're being honest, most everybody I've talked to about it and several reviews/articles about it like the one below, indicate that it's such a small difference it's probably not worth worrying about anyhow plus a lot of games Nvidia has bluntly stated won't see any benefit from it.

https://www.rockpapershotgun.com/what-is-resizable-bar-and-should-you-use-it

 

[InTakeYT1]

You're right. My bad. I could have sworn that you had an AMD graphics card but I guess it was just an AMD CPU.

Regardless, if you REALLY feel like you need to try it, update the BIOS and then try it. But if we're being honest, most everybody I've talked to about it and several reviews/articles about it like the one below, indicate that it's such a small difference it's probably not worth worrying about anyhow plus a lot of games Nvidia has bluntly stated won't see any benefit from it.

https://www.rockpapershotgun.com/what-is-resizable-bar-and-should-you-use-it

I updated my mobo bios to the latest one not in beta, still nothing. I want to try it for "Escape From Tarkov" because the spaghetti code for their AI puts strain on the cpu. The only vid I've seen it used on tarkov was his complaint that it went over max on his vram (he had 3070ti so 8GB vram vs me with a 3090 24GB vram). I believe this feature relieves some stress and will gain significant performance boost as I only get around 60% gpu usage ("normal" in tarkov online because offline with bots disabled I get 95+% gpu util)

 

[InTakeYT1]

You're right. My bad. I could have sworn that you had an AMD graphics card but I guess it was just an AMD CPU.

Regardless, if you REALLY feel like you need to try it, update the BIOS and then try it. But if we're being honest, most everybody I've talked to about it and several reviews/articles about it like the one below, indicate that it's such a small difference it's probably not worth worrying about anyhow plus a lot of games Nvidia has bluntly stated won't see any benefit from it.

https://www.rockpapershotgun.com/what-is-resizable-bar-and-should-you-use-it

my best guess is ryzen 7000 isnt supported by resizable bar?

 

[Darkbreeze]

AMD Ryzen 5 7600X Review: Mainstream Zen 4

The new Ryzen 5 7600X is a 6-core/12-thread CPU that replaces the popular 5600X, built on TSMC's 5nm process, it clocks up to 5.3 GHz, packs 32MB...

www.techspot.com

Seems supported to me.

 

[InTakeYT1]

AMD Ryzen 5 7600X Review: Mainstream Zen 4

The new Ryzen 5 7600X is a 6-core/12-thread CPU that replaces the popular 5600X, built on TSMC's 5nm process, it clocks up to 5.3 GHz, packs 32MB...

www.techspot.com

Seems supported to me.

Found this page (https://www.techpowerup.com/vgabios...=RTX+3090&interface=&memType=&memSize=&since=) which had an updated bios whereas the OFFICIAL msi page doesn't (????). Anyway did a vbios flash with nvflash and resizable bar is now enabled.

 

[ohio_buckeye]

Can’t speak for nvidia but reviews I’ve seen atm to indicate depending on the title that smart access memory does help.

View: https://youtu.be/SAkDb60WdYk

 

[Darkbreeze]

Sure, it CAN. But from read so far both SAM and Resizable bar, which are the exact same thing and are neither AMD nor Nvidia technologies, but have been written into the spec since the first PCIe 3.0 standard went live, have pretty minimal gains in general. Some titles do seem to benefit more than others but it's only a handful and likely also depends heavily on what your specific quality settings are tuned to as well.

I personally haven't made comparisons yet so I can't speak from experience, but judging by the experiences of the reviewers I've read nobody has been terribly impressed yet although again, they've all basically said that they've seen a few moderate gains on one or two titles. So most likely mileage is going to vary, possibly by a lot in some cases.

 

[mjbn1977]

Sure, it CAN. But from read so far both SAM and Resizable bar, which are the exact same thing and are neither AMD nor Nvidia technologies, but have been written into the spec since the first PCIe 3.0 standard went live, have pretty minimal gains in general. Some titles do seem to benefit more than others but it's only a handful and likely also depends heavily on what your specific quality settings are tuned to as well.

I personally haven't made comparisons yet so I can't speak from experience, but judging by the experiences of the reviewers I've read nobody has been terribly impressed yet although again, they've all basically said that they've seen a few moderate gains on one or two titles. So most likely mileage is going to vary, possibly by a lot in some cases.

Unless it is an Intel Arc GPU....they want Rebar turned on and Intel highly recommends it...

Intel quote: "Resizable BAR (or Smart Access Memory) must be enabled for optimal performance when using Intel® Arc™ A-Series Graphics. Though, Intel® Arc™ Graphics can still work on a system without Resizable BAR enabled. Resizable bar is a motherboard feature that can be enabled under BIOS settings. "

 

[Kona45primo]

Check in AMD Software Adrenalin Edition... ---> Performance --> Tuning middle right should have Tuning Preset & a little toggle for AMD Smartaccess Memory.

 

[Tennis987]

When i tried Rebar it actually decreased my fps in Death Stranding and Borderlands 3 and increased my CPU temp by 5c.

 

[Darkbreeze]

Unless it is an Intel Arc GPU....they want Rebar turned on and Intel highly recommends it...

Intel quote: "Resizable BAR (or Smart Access Memory) must be enabled for optimal performance when using Intel® Arc™ A-Series Graphics. Though, Intel® Arc™ Graphics can still work on a system without Resizable BAR enabled. Resizable bar is a motherboard feature that can be enabled under BIOS settings. "

How is this relevant to this thread?

 

[mjbn1977]

How is this relevant to this thread?

I just mentioned it because someone said in the thread that Resizable BAR gains are minimal, but for Arc cards this is not true since rebar has big impact on those cards. Even so OP has none...

 

[Darkbreeze]

Why is it you think it would have a bigger impact on Intel cards than any others? It is not an Intel technology. It is part of the PCIe specification and as such, the only way Intel based cards could benefit from it more than other cards is if it were strictly a software limitation. As such I'd find it incredibly hard to believe that Intel, who so far has done nothing but struggle with driver support to the point of almost abandoning the entire architecture, has magically found some way to leverage it's driver framework in a way that nobody else has managed to do. Just doesn't add up.

I also have seen zero indications of any reviewers backing that theory either.