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

RPX100 · Oct 13, 2021

@Mussels be so kind and head to Device Manager, right click on your Graphics Card (under Display Adapters)
and then select the properties window's "resources" tab and post a screenshot of those memory ranges.
-> This might help to understand if GPU-Z is reading something wrong or if your system is somehow indeed using 32 GB.

Mussels · Oct 13, 2021

RPX100 said:
@Mussels be so kind and head to Device Manager, right click on your Graphics Card (under Display Adapters)
and then select the properties window's "resources" tab and post a screenshot of those memory ranges.
-> This might help to understand if GPU-Z is reading something wrong or if your system is somehow indeed using 32 GB.

W1zzard · Oct 13, 2021

RPX100 said:
... ... the 3090 has 24GB VRAM, right? (double checked your system specs... 24GB indeed)
@W1zzard should point out what we are looking at here. I don't understand what is happening.

The BAR can only be set to power of two sizes

Mussels said:
Cause damn, going upto 32GB seems huge

It really doesn't cost you anything, it's just a mapping into the huge 64-bit memory address space that "redirects" data to the GPU's memory

RPX100 · Oct 13, 2021

Hm, very interesting. That "Large Memory Range" is indeed 32 GB.

I believe this could mean that BAR allows up to 32 GB of VRAM being used.
Even though your card has 24GB installed. Maybe BAR needs to be power of 2?

---
... and @W1zzard replied while I was writing this message. Thanks for confirming this.

wrth7 · Oct 24, 2021

Hi, Sapphire RX 5600 XT Pulse user here. I'm on the same boat with OP. ReBar and Above 4G Decoding is Enabled in BIOS, CSM is disabled. Adrenalin says SAM is Enabled. However, device manager does not report Large Memory Range. The reported range is 1GB. Submitted a bug report to AMD.

The strange thing is, RX 5500 XT (8G) users reporting they see Large Memory Range in device manager. So, I'm starting to think that maybe ReBar is configured to work in a way that, accessible memory is 1GB for GPUs having less than 8GB of VRAM and power of 2 (such as 8, 16, 32 depending on the VRAM size) for GPUs having more than 8GB VRAM.

RPX100 · Oct 24, 2021

Hello! Thanks for confirming this on yet another RX 5600 XT.

wrth7 said:
maybe ReBar is configured to work in a way that, accessible memory is 1GB for GPUs having less than 8GB of VRAM

Haha, yeah ... maybe it is indeed.
But then you could wonder why is it not using 4GB instead? :rolleyes:

wrth7 · Oct 24, 2021

RPX100 said:
But then you could wonder why is it not using 4GB instead?

Yup. That's confusing...

stiffmeister · Oct 24, 2021

wrth7 said:
Hi, Sapphire RX 5600 XT Pulse user here. I'm on the same boat with OP. ReBar and Above 4G Decoding is Enabled in BIOS, CSM is disabled. Adrenalin says SAM is Enabled. However, device manager does not report Large Memory Range. The reported range is 1GB. Submitted a bug report to AMD.

The strange thing is, RX 5500 XT (8G) users reporting they see Large Memory Range in device manager. So, I'm starting to think that maybe ReBar is configured to work in a way that, accessible memory is 1GB for GPUs having less than 8GB of VRAM and power of 2 (such as 8, 16, 32 depending on the VRAM size) for GPUs having more than 8GB VRAM.

You should file a report to AMD

RPX100 · Oct 24, 2021

stiffmeister said:
You should file a report to AMD

Read his message again. He already did send a bug report.
You even have that part in your quote. ^^

stiffmeister · Oct 24, 2021

RPX100 said:
Read his message again. He already did send a bug report.
You even have that part in your quote. ^^

Eyes are not connecting with brain :kookoo:

rethcirE · Oct 24, 2021

*Cries in RTX 2000-Series*

One day someone will figure out how to enable this for RTX-2000! I'm so close...

RPX100 · Oct 24, 2021

rethcirE said:
someone will figure out how

This someone is nvidia in this case. They would have to allow the 2000 series to use it via driver.
Right now you are literally being denied access to a PCI-express feature by choice of nvidia. :rolleyes:

Same thing was happening with AMD's 5000 series up until 21.9.1 driver (sept 2021).

eidairaman1 · Oct 24, 2021

RPX100 said:
Same thing was happening with AMD's 5000 series up until 20.9.1 driver (sept 2021).

AMD was probably testing this before enabling it. Side Band Addressing was an ATi/AMD feature but was disabled due to instability from it.

Point is AMD enabled it and nvidia will not by forcing planned obsolescence

rethcirE said:
*Cries in RTX 2000-Series*

View attachment 222218

One day someone will figure out how to enable this for RTX-2000! I'm so close...

With inflation you could recover your loss by selling your gpu for more than msrp lol.

Zubasa · Oct 24, 2021

RPX100 said:
This someone is nvidia in this case. They would have to allow the 2000 series to use it via driver.
Right now you are literally being denied access to a PCI-express feature by choice of nvidia.

Same thing was happening with AMD's 5000 series up until 21.9.1 driver (sept 2021).

In nVidia's case it is more than just driver. The bios is locked and will require a bios update that nVidia have no incentive to provide.
For older AMD cards, Re-Bar support was never locked in the bios, the driver just did not support it.

RPX100 · Oct 24, 2021

Zubasa said:
The bios is locked and will require a bios update that nVidia have no incentive to provide.

They are trying really hard to force you to buy the newer GPU generation then. Oh boy. :rolleyes:

rethcirE · Oct 25, 2021

There is a vBIOS flash tool for RTX 3000 series cards right on the nvidia site, ready for download by the end user. To think RTX 2000 users can't be given this same option is silly.

NVIDIA Support

nvidia.custhelp.com

Why can't we all have this if it's an option for some?

Athlonite · Oct 28, 2021

rethcirE said:
Why can't we all have this if it's an option for some?

because nGreedia don't want you to have it without paying their nTax for it by buying a new 3000 series GPU

masterdeejay · Dec 29, 2021

Gpuz shows enabled, benchmark scores better..
Above 4g decoding, uefi boot, secure boot enabled, csm disabled. Newest modded drivers and registry hack installed.
So it is working?

Tanzmusikus · Dec 29, 2021

Feel free to use the beta version GPU-Z 2.43.2 from post #40.
Have al look at special sub category "PCIe Resizable BAR" of [Advanced] tab.

And second take a look into Radeon driver -> Performance -> Configuration.
There should be the tab [Smart Access Memory] showing "enabled" or "disabled".

Best regards

masterdeejay · Dec 29, 2021

Tanzmusikus said:
Feel free to use the beta version GPU-Z 2.43.2 from post #40.
Have al look at special sub category "PCIe Resizable BAR" of [Advanced] tab.

It is enabled but not working?
But the fps and the scores are better. Interesting.
I enabled the radeon driver setting in registry, because no SAM switch showing up.

Tanzmusikus · Dec 29, 2021

If you use a modded driver to make this possible, then GPU-Z can't give you correct info.
GPU-Z shows only offical values.

So you have to watch radeon driver under Windows and benchmarks to proof the SAM state.

***

At the end the gpu can also get benefit from activate state of "Above 4Decoding" and "Resizable BAR" in UEFI.

You could test it in Linux too. Linux doesn't need any driver switches to use SAM.
Have a look at post #37 and post #39 to get the commands.
In post #43 you can have a look at examples of results.

Naki · Dec 29, 2021

masterdeejay said:
Gpuz shows enabled, benchmark scores better..
Above 4g decoding, uefi boot, secure boot enabled, csm disabled. Newest modded drivers and registry hack installed.
So it is working?
View attachment 230523 View attachment 230524

Why are you not using UEFI mode for Windows 10 OS?! :confused:

Tanzmusikus · Dec 29, 2021

Naki said:
Why are you not using UEFI mode for Windows 10 OS?!

"CSM disabled = Yes"
"Boot from GPT = Yes"

He is using that - why do you think, he's not?

Naki · Dec 29, 2021

Tanzmusikus said:
"CSM disabled = Yes"
"Boot from GPT = Yes"

He is using that - why do you think, he's not?

UEFI is unchecked in his GPU-Z screenshot (leftmost one).

Tanzmusikus · Dec 29, 2021

Maybe one of us needs glasses.

Processor	AMD Ryzen 7 3800 XT @ 4250 MHz, 1.275V
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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]
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Video Card(s)	ASRock RX 5700 XT Challenger Pro 8GB, driver 21.9.1, S.A.M. enabled, 155W undervolt
Storage	2x 2TB NVMe
Display(s)	1x 1920x1080p 60Hz, 1x 2560x1440p 60Hz
Power Supply	650W: 20A 3,3V; 20A 5V; 54A 12V; 80+ Gold
Benchmark Scores	timespy: GPU ~9800, CPU ~10600

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
Video Card(s)	ASRock RX 5700 XT Challenger Pro 8GB, driver 21.9.1, S.A.M. enabled, 155W undervolt
Storage	2x 2TB NVMe
Display(s)	1x 1920x1080p 60Hz, 1x 2560x1440p 60Hz
Power Supply	650W: 20A 3,3V; 20A 5V; 54A 12V; 80+ Gold
Benchmark Scores	timespy: GPU ~9800, CPU ~10600

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

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