AMD Smart Access Memory not enabling in BIOS according to GPU-Z

[qualk]

Hello,
GPU-Z says "Resizable BAR enabled in BIOS No", even though I have enabled it in the BIOS, and there is GPU hardware support, and the Radeon Software reports that it's turned on. Also, no Large Memory Range comes up in the Device Manager resources, which confirms it is turned off. I have a ASRock X570 Steel Legend (AGESA Combo V2 PI 1.2.0.3 Patch C BIOS), and a XFX Radeon RX 5600 XT THICC II PRO, and a Ryzen 7 3700X (CPU is compatible). I attached a picture of GPU-Z below. Thanks in regards!

 

[Mussels]

Fill out your complete system specs, trust me it helps, tick yes at the first option

TechPowerUp Forum
You need ReBar and above 4G decoding enabled, and only with certain CPU's (which you didn't mention... hence the specs)

The 5000 series only had REBAR support added in the latest driver - 21.9.1

 

[RPX100]

XFX Radeon RX 5600 XT THICC II PRO

I have seen another user (in german ComputerBase Forum) who has the exact same issues,
with XFX Radeon RX 5600 XT Thicc III Ultra - maybe this is XFX or RX 5600 XT related.

This user also reports missing "large memory range", GPU-Z shows that reBAR is disabled,
although the switch is set to enabled within the BIOS. ( MSI MEG X570 Unify )

 

[qualk]

Fill out your complete system specs, trust me it helps, tick yes at the first option

TechPowerUp Forum
You need ReBar and above 4G decoding enabled, and only with certain CPU's (which you didn't mention... hence the specs)

The 5000 series only had REBAR support added in the latest driver - 21.9.1

I have a AMD Ryzen 7 3700X, and there are select 3000 series CPU's that do work, and I am on that list.
I have also enabled 4G decoding, in ASRock BIOS, you have to enable it before toggling Resizable BAR.

 

[Mussels]

Also "Latest BIOS" is meaningless, unless you specify what BIOS that is
To some people that's the latest BETA, to some its official only, and others may view a different website

I'll assume you're on 3.80, with the updates for win 11 and AGESA Combo V2 PI 1.2.0.3 Patch C


There is very, very little information about SAM/ReBAR and compatibility unfortunately.

3000 series CPU's (without APU) are compatible, but it was added after launch
5000 series GPU's are compatible, added in via driver after launch
No ones tested the bloody two together, officially that i can find.


On reddit i've seen comments you need the UWP driver from windows update and not the one from the AMD website mentioned a few times, unsure how true that is, but worth a shot?

Oh it also needs to be enabled in the AMD software apparently, i have no idea where to find that setting, but i can imagine it being disabled there could give odd readings in GPU-Z.

 

[Kapone33]

Also "Latest BIOS" is meaningless, unless you specify what BIOS that is
To some people that's the latest BETA, to some its official only, and others may view a different website

I'll assume you're on 3.80, with the updates for win 11 and AGESA Combo V2 PI 1.2.0.3 Patch C


There is very, very little information about SAM/ReBAR and compatibility unfortunately.

3000 series CPU's (without APU) are compatible, but it was added after launch
5000 series GPU's are compatible, added in via driver after launch
No ones tested the bloody two together, officially that i can find.


On reddit i've seen comments you need the UWP driver from windows update and not the one from the AMD website mentioned a few times, unsure how true that is, but worth a shot?
View attachment 220298

Oh it also needs to be enabled in the AMD software apparently, i have no idea where to find that setting, but i can imagine it being disabled there could give odd readings in GPU-Z.

You would see it in the Performance tab sub menu in Tuning. There will be a toggle on the bottom of the Tuning page (under the GPU) that confirms SAM enabled. You can disable it but you have to enable Above 4G decoding in the BIOS. Every X570 board I have tested has had that in the BIOS. MSI for sure and Asus too.

 

[qualk]

I'll assume you're on 3.80, with the updates for win 11 and AGESA Combo V2 PI 1.2.0.3 Patch C

That's correct, sorry for not specifying that. Edited the original post.

You would see it in the Performance tab sub menu in Tuning. There will be a toggle on the bottom of the Tuning page (under the GPU) that confirms SAM enabled. You can disable it but you have to enable Above 4G decoding in the BIOS. Every X570 board I have tested has had that in the BIOS. MSI for sure and Asus too.

Okay, wtf is happening. Earlier, that option was there, and I enabled it, but then I restarted my computer, and now it says it 's not available. What is happening

 

[Mussels]

You would see it in the Performance tab sub menu in Tuning. There will be a toggle on the bottom of the Tuning page (under the GPU) that confirms SAM enabled. You can disable it but you have to enable Above 4G decoding in the BIOS. Every X570 board I have tested has had that in the BIOS. MSI for sure and Asus too.

The BIOS is easy to find (mine has a shortcut in the top right, available on every screen) - it's the AMD GPU Software i'm unfamiliar with

 

[qualk]

The BIOS is easy to find (mine has a shortcut in the top right, available on every screen) - it's the AMD GPU Software i'm unfamiliar with

He is talking about the software, I presume he just accidentally structured the message weirdly.

 

[Shou Miko]

I had Resizeable bar enabled on my 3 AMD Radeon RX 6800 series cards I owned on Asus and Gigabyte motherboards with an issues, it was just going into the bios as said before enable resizeable bar and above 4g decoding that was it.

I used a AMD Ryzen 9 3900X and Asus ROG Strix B550-A Gaming and my current Intel Core i7-11700K and Gigabyte Z590 Vision G.

I owned AMD Radeon RX 6800 Reference (PowerColor), MSI Radeon RX 6800 XT Gaming X Trio and last a AMD Radeon RX 6800 XT Reference (AMD).

I now own a RTX 3090 with my Intel platform.

 

[qualk]

I had Resizeable bar enabled on my 3 AMD Radeon RX 6800 series cards

What brand?

 

[Shou Miko]

What brand?

I listed them further down in my post, but I can quote myself...

I owned AMD Radeon RX 6800 Reference (PowerColor), MSI Radeon RX 6800 XT Gaming X Trio and last a AMD Radeon RX 6800 XT Reference (AMD).

 

[qualk]

I listed them further down in my post, but I can quote myself...

Oh whoops, sorry, but the problem looks like it's with XFX.

 

[Shou Miko]

Oh whoops, sorry, but the problem looks like it's with XFX.

That wouldn't be a new thing, read things about XFX through their time even I never owned a card from them.

 

[W1zzard]

Also, no Large Memory Range comes up in the Device Manager resources

Then to the best of my knowledge you don't have Resizable BAR enabled. Can you post a screenshot of device manager -> resources?

 

[qualk]

Then to the best of my knowledge you don't have Resizable BAR enabled. Can you post a screenshot of device manager -> resources?

The weird thing is AMD Radeon Software says that it is enabled.

Here are the screenshots.

 

[W1zzard]

The first memory range is 1 GB, so larger than default but not "full VRAM" large.

Could you turn off BAR and post another screenshot?

 

[qualk]

I left "Above 4G Decoding" on.

 

[W1zzard]

And down to 256 MB. I guess I'll update GPU-Z to look for a memory range of 1 GB or larger, and not for a memory range that matches the VRAM size

 

[RPX100]

So does that mean that SAM is actually working as intended here?
-> it is enabled in Radeon Software, but does not use 100% of the VRAM
In theory that should still be better than 256 MB...

@W1zzard Can you tell where the limit is coming from? system BIOS? GPU vBIOS?

 

[W1zzard]

Can you tell where the limit is coming from? system BIOS? GPU vBIOS?

Most certainly from AMD, driver or VBIOS, might be the way it's designed to work. Let me check with my 5600 XT

 

[RPX100]

Maybe you could also update GPU-Z to show how much VRAM is being used for SAM?
I guess this could be interesting to know, as there seem to be differences for some GPUs.

 

[qualk]

The first memory range is 1 GB, so larger than default but not "full VRAM" large.

Could you turn off BAR and post another screenshot?

Looks like that's what AMD thinks

 

[RPX100]

@qualk which AMD chipset driver version do you have installed?
(You can check that under installed Windows Apps & Features by clicking on the AMD Chipset Software)

 

[W1zzard]

Looks like that's what AMD thinks
View attachment 220309

Technically it is not "the maximum amount". and not sure if it's right to explain "ReBAR off" as "SAM is enabled, but uses only 256 MB of memory"

Probably because AMD let some intern noob write those descriptions, or Legal