After today’s 21.9.1 driver, SAM is detected on my 3600/RX5700XT + B450 system

1 : Anonymous2021/09/13 17:51 ID: pnkl88
After today's 21.9.1 driver, SAM is detected on my 3600/RX5700XT + B450 system
2 : Anonymous2021/09/13 17:53 ID: hcptv48

Just to be clear, the main takeaway is that you don't need a B550/X570 board to enable SAM after this driver update.

ID: hcpznlg

Many b450 mobo already have bios to enable sam tho

ID: hcq0oae

I know, my point is AMD doesn't officially support B450/X470 but it seems to be working fine on the contrary.

ID: hcql4xv

The BIOS toggle is for rebar, not SAM. SAM is AMD's tech on top of rebar. That's why Nvidia's GPUs gain less from rebar than AMD's GPUs gain from SAM.

ID: hcpujtm

I've been trying to wait for a non-beta for my non-max board... But will probably do the bios update when I get a free 1/2 day.

I'll probably only test bl3.

ID: hcqgwot

That ia wrong, you never needed. A b450 would work perfectly

ID: hcqjboc

.... I know, I'm just confirming despite AMD's not officially supporting it. I've had it turn on for months now and worked fine on Linux.

ID: hcqk97x

Which b450 you running

ID: hcqnh4m

MSI B450 TOMAHAWK non-MAX with latest BIOS.

3 : Anonymous2021/09/13 18:49 ID: hcq231p

Try doing some test using AC Valhalla if you have it. I've noticed that Valhalla has noticeable performance improvement when SAM is ON, compared to when it's OFF.

4 : Anonymous2021/09/13 20:04 ID: hcqda8c

Crying in ryzen 2000 series ...

ID: hcqj1m8

crying in ryzen 2000 series radeon rx500 series

ID: hcqjho2

I have an 2700xt and the driver says it's activated...

ID: hcqmoef


ID: hcqv6je

oh wow ! you need to tell me how ! I have the same config.

EDIT: having an MSI X470 gaming pro carbon

ID: hcqnk5f

Now this is interesting.

5 : Anonymous2021/09/13 18:33 ID: hcpzr3e

Did a quick unscientific test with Cyberpunk 2077 on a static scene.

62-63FPS w/ SAM OFF

65-66FPS w/ SAM ON

ID: hcqi3p0

It was 10-15% for me on 6800XT.

6 : Anonymous2021/09/13 19:54 ID: hcqbqmb

Can I just say, that I am 100% extremely wrong and never underestimate AMD how they can implement things. I am always amazed!

7 : Anonymous2021/09/13 21:12 ID: hcqnc60

5600XT working as well

8 : Anonymous2021/09/13 18:52 ID: hcq2krx

So we don't need a RDNA2/Zen3 anymore?

ID: hcqh3pt

You never needed zen3, only rdna2. It would work on zen2 as well, and intel cpus

ID: hcqh550

Nope. They switched up the software UI too and added an Auto Overclock feature that OCs your CPU/GPU

9 : Anonymous2021/09/13 20:53 ID: hcqkhsn

I have a 3600, 5700 xt and a b450 motherboard, it is not showing as an option for me. Says Not Available.

ID: hcqkoiy

Thats because you need to change csm to uefi

Only uefi bios supports SAM. read my second last message.

ID: hcqohzj

I am using uefi already. I do have virtualization enabled to run vm's. wonder if that could do it.

10 : Anonymous2021/09/13 21:25 ID: hcqp8iu

interesting. Mine isn't reading it for some reason. Unfortunate.

11 : Anonymous2021/09/13 18:02 ID: hcpva0j

bench ?

12 : Anonymous2021/09/13 19:16 ID: hcq65ic

I cant seem to boot into windows 10, same setup. When I enabled csm to uefi, enable sam and then boot, none of my drives with windows 10 show up

ID: hcq8nxb

Try disabling CSM. I had it enabled on a Aorus board and it doesn't work. The Aorus/Gigabyte website shows you have to disable CSM for it to work.

ID: hcq9b3k

I have a msi x570 board, Its switched from csm to uefi and couldn't find a boot drive

ID: hcqhlq6

You cant enable uefi if your windows installation is csm.

CSM is the legacy way for bios.

CSM requires windows to be installed on MBR partitions, while UEFI needs GPT partition.

UEFI doesnt recognize mbr drives, need to format them and turn them into gpt.

I juat reinstalled windows 10 and turned my old cms mbr partitions to GPT.

13 : Anonymous2021/09/13 19:27 ID: hcq7q8o

You know, if AMD didn't drop support for their R9 390 cards I'd be very happy. Nevertheless this is good support for many owners out there!

14 : Anonymous2021/09/13 19:41 ID: hcq9s8n

We got the exact same system 😀

15 : Anonymous2021/09/13 20:08 ID: hcqdvda

what is SAM?

ID: hcqh6wg

Smart access memory dude. Free performance

ID: hcqjn6w

I have MSI B550-A Pro, 5600X, Corsair Vengeance RGB Pro SL 4x8GB 3600MHz and Gainward 3060ti OC. Can i use this option? And how?

16 : Anonymous2021/09/13 20:19 ID: hcqffgz

Whaaat? I thought you had to have a 6000 series card for this to work. I'll have to update later today and give it a shot on my 3800x/5700 xt

17 : Anonymous2021/09/13 20:29 ID: hcqh0pv

I already sis a few tests and will release a video soon 😀

18 : Anonymous2021/09/13 20:47 ID: hcqjp9q

do you need the full version of radeon software to see it in the software ? got a x470 with a 6700xt, i can activate sam in uefi but i don't see anything in the software with the minimalist version

19 : Anonymous2021/09/13 20:55 ID: hcqkubx

X370 support when?

ID: hcqqpef

Never. Just upgrade to a X570/B550 that has lan/usb issues.

ID: hcqrwk3


20 : Anonymous2021/09/13 21:13 ID: hcqnglt

Sorry but what is sam?

21 : Anonymous2021/09/13 21:21 ID: hcqokyi

3800X and 5700XT here,

Enabled Resize Bar and Above 4G Decoding in UEFI. Rebooted, Windows did some stuff, rebooted again.

I don't see any "Smart Access Memory" toggle under Tuning, but HWiNFO indicates it's enabled, and I have an entry for "Large Memory Range" under my graphics card in Device Manager. So I think it's working...

22 : Anonymous2021/09/13 21:27 ID: hcqpi0e

After 3 hours of updating bios/drivers and researching I finally got sam to work on same setup, glad you posted this up.

23 : Anonymous2021/09/13 21:31 ID: hcqq3kt

I have a RX 5600 XT, Ryzen 5600x and Asus TUF X570 with latest bios installed. Running Windows 11 latest beta build.

Above 4G = ON;
Rebar = ON;
Resizable Bar = Auto;


(Yes, there is two options for Resizable Bar inside Asus BIOS).

Adrenalin software shows that SAM is enabled, but i don't see the Large Memory Range and GPU-Z reports that Resizable Bar is disabled and my graphics card is not compatible.

Any ideas?

24 : Anonymous2021/09/13 21:35 ID: hcqqnlu

I have i5 11400 and x560 intel chipset with 5700xt... that means I can't have SAM even if I enable resizable bar? So I won't benefiy at all? 🙁

26 : Anonymous2021/09/13 21:45 ID: hcqs1e7

I'm loving that we're getting free performance uplifts. Very nice.

27 : Anonymous2021/09/13 22:05 ID: hcqut78

I have downloaded the latest 21.9.1 driver and instead of "smart access memory" It reads "resizable bar". I have enabled resizable bar in the bios and after restart I have it enabled in the drivers.
I have i5 11400 and 5700xt. Do I benefit at all from it or should I disable it?

28 : Anonymous2021/09/13 22:15 ID: hcqw3v8

works on my MSI x470 m7 AC w/ 5700 XT and 5600x

29 : Anonymous2021/09/13 23:15 ID: hcr3qz8

I can't find Resizable BAR option in my BIOS options, can anyone help me? I can enable/disable 4G Decoding but nothing else.

Here's is my pc specification RX 5600

30 : Anonymous2021/09/13 23:34 ID: hcr66cz

I have a 3600 and I often find it to be the bottleneck for my Vega 56 (kinda low single core performance). Probably going to look into upgrading both CPU and GPU soon since better (still budget) options are available. Hoping for a good 2022 for AMD cards though, Nvidia seems to never stop releasing cards.

31 : Anonymous2021/09/13 20:37 ID: hcqi5kg


You cant simply change your CSM to UEFI.

If you try and all your drives are MBR (CSM) UEFI bios doesnt recognize them.

Also, you cant change your windows drive to GPT partition without having to format the drive.

This is because uefi needs GPT partitioned drives. which means you need to reinstall windows after changing from csm to uefi so the windows installer partitions the newly formatted drive aa GPT.

32 : Anonymous2021/09/13 21:28 ID: hcqpo47

This is partially true. You do need to be on a GPT format, and if you're not the windows drive wont show up as a boot option. But you dont actually need to reinstall windows to fix this. I had the CSM issue and I believe I used this guide to change to GPT without any issues

33 : Anonymous2021/09/13 18:00 ID: hcpuzbi

Just make sure when using this to make sure it helps in game performance. Just because something is enabled doesn't mean it necessarily helps.


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