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

qualk · Oct 11, 2021

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 · Oct 11, 2021

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 · Oct 11, 2021

qualk said:
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 · Oct 11, 2021

Mussels said:
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 · Oct 11, 2021

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.

kapone32 · Oct 11, 2021

Mussels said:
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 · Oct 11, 2021

Mussels said:
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.

kapone32 said:
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 · Oct 11, 2021

kapone32 said:
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 · Oct 11, 2021

Mussels said:
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 · Oct 11, 2021

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 · Oct 11, 2021

puma99dk| said:
I had Resizeable bar enabled on my 3 AMD Radeon RX 6800 series cards

What brand?

Shou Miko · Oct 11, 2021

qualk said:
What brand?

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

puma99dk| said:
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 · Oct 11, 2021

puma99dk| said:
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 · Oct 11, 2021

qualk said:
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 · Oct 11, 2021

qualk said:
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 · Oct 11, 2021

W1zzard said:
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 · Oct 11, 2021

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 · Oct 11, 2021

I left "Above 4G Decoding" on.

W1zzard · Oct 11, 2021

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 · Oct 11, 2021

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 · Oct 11, 2021

RPX100 said:
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 · Oct 11, 2021

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 · Oct 11, 2021

W1zzard said:
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 · Oct 11, 2021

@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 · Oct 11, 2021

qualk said:
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

System Name	idk
Processor	AMD Ryzen 7 3700X
Motherboard	ASRock X570 Steel Legend
Cooling	Stock AMD cooler & a few other Noctua fans

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Processor	Ryzen R7 5800x3D (Undervolted, 4.45GHz all core)
Motherboard	Asus x570-F (BIOS Modded)
Cooling	Alphacool Apex UV - Alphacool Eisblock XPX Aurora + EK Quantum ARGB 3090 w/ active backplate
Memory	2x32GB DDR4 3600 Corsair Vengeance RGB @3866 C18-22-22-22-42 TRFC704 (1.4V Hynix MJR - SoC 1.15V)
Video Card(s)	Galax RTX 3090 SG 24GB: Underclocked to 1700Mhz 0.750v (375W down to 250W))
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Display(s)	Phillips 32 32M1N5800A (4k144), LG 32" (4K60) \| Gigabyte G32QC (2k165) \| Phillips 328m6fjrmb (2K144)
Case	Fractal Design R6
Audio Device(s)	Logitech G560 \| Corsair Void pro RGB \|Blue Yeti mic
Power Supply	Fractal Ion+ 2 860W (Platinum) (This thing is God-tier. Silent and TINY)
Mouse	Logitech G Pro wireless + Steelseries Prisma XL
Keyboard	Razer Huntsman TE ( Sexy white keycaps)
VR HMD	Oculus Rift S + Quest 2
Software	Windows 11 pro x64 (Yes, it's genuinely a good OS) OpenRGB - ditch the branded bloatware!
Benchmark Scores	Nyooom.

Processor	AMD Ryzen 7 3800 XT @ 4250 MHz, 1.275V
Motherboard	MSI B550-A Pro, chipset: 3.09.01.140, BIOS A.50 (7C56vA5), Agesa 1.2.0.0
Cooling	Scythe Mugen 5 Rev B, 4x CoolerMaster SickleFlow 120 PWM [100% RPM @ 70°C]
Memory	2x 16 GB G.Skill F4-3600C16-16GVKC, Dual Channel, Dual Ranks, 1.35V
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System Name	idk
Processor	AMD Ryzen 7 3700X
Motherboard	ASRock X570 Steel Legend
Cooling	Stock AMD cooler & a few other Noctua fans

System Name	Rainbow Sparkles (Power efficient, <350W gaming load)
Processor	Ryzen R7 5800x3D (Undervolted, 4.45GHz all core)
Motherboard	Asus x570-F (BIOS Modded)
Cooling	Alphacool Apex UV - Alphacool Eisblock XPX Aurora + EK Quantum ARGB 3090 w/ active backplate
Memory	2x32GB DDR4 3600 Corsair Vengeance RGB @3866 C18-22-22-22-42 TRFC704 (1.4V Hynix MJR - SoC 1.15V)
Video Card(s)	Galax RTX 3090 SG 24GB: Underclocked to 1700Mhz 0.750v (375W down to 250W))
Storage	2TB WD SN850 NVME + 1TB Sasmsung 970 Pro NVME + 1TB Intel 6000P NVME USB 3.2
Display(s)	Phillips 32 32M1N5800A (4k144), LG 32" (4K60) \| Gigabyte G32QC (2k165) \| Phillips 328m6fjrmb (2K144)
Case	Fractal Design R6
Audio Device(s)	Logitech G560 \| Corsair Void pro RGB \|Blue Yeti mic
Power Supply	Fractal Ion+ 2 860W (Platinum) (This thing is God-tier. Silent and TINY)
Mouse	Logitech G Pro wireless + Steelseries Prisma XL
Keyboard	Razer Huntsman TE ( Sexy white keycaps)
VR HMD	Oculus Rift S + Quest 2
Software	Windows 11 pro x64 (Yes, it's genuinely a good OS) OpenRGB - ditch the branded bloatware!
Benchmark Scores	Nyooom.

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

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Processor	AMD Ryzen 7 7700 Raphael \ i7-8550U Kaby Lake-R
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