Resizable BAR / SAM for Ryzen 3000 - ASROCK X570 Taichi

F7GOS · Jan 26, 2021

Looks like ASRocks latest 4.00 BIOS has enabled S.A.M for Zen 2 based 3000 and 4000 CPUs.

Decent little performance bump on the RX 6800

oobymach · Jan 26, 2021

Apparently works with gtx 3000 series cards as well.

Zach_01 · Jan 27, 2021

I also notice the Re-Size Bar setting in my BIOS a couple of BIOS versions back.

AorusPro X570, R5 3600, 5700XT. Didn’t test it though, as my GPU drivers are from September 2020.

StormLightningSL · Jan 27, 2021

I don't think Resizable BAR support is enabled on 5700XT yet.
I believe I read somewhere that it is only enabled in AMD 6000 series and Nvidia 3000 series.

I'm looking for a 3080, maybe 2X (for two separate systems), but it's going to be a dream for a while with the current situation.

ratirt · Jan 27, 2021

StormLightningSL said:
I don't think Resizable BAR support is enabled on 5700XT yet.
I believe I read somewhere that it is only enabled in AMD 6000 series and Nvidia 3000 series.

I'm looking for a 3080, maybe 2X (for two separate systems), but it's going to be a dream for a while with the current situation.

Does this feature is CPU or GPU enabled or is it the motherboard that allows it? If motherboard supports the BAR feature would it enable the CPU to make the use of it despite of the GPU?
The BAR feature is not anything new and if there is an interface, the CPU can utilize it. I think the CPU is the main beneficent here not the GPU. Maybe both CPU and GPU have to support this? I really think it is the CPU that matters here. If the 3000 series can do it I'm sure all CPUs would be able to utilize this in certain manner.

I been trying to find a 6800XT liquid but with no luck. There are no 3080 either. The only cards I can buy now are the overpriced 6900XT and 3090. That sucks.

INSTG8R · Jan 27, 2021

StormLightningSL said:
I don't think Resizable BAR support is enabled on 5700XT yet.
I believe I read somewhere that it is only enabled in AMD 6000 series and Nvidia 3000 series.

I'm looking for a 3080, maybe 2X (for two separate systems), but it's going to be a dream for a while with the current situation.

It kinda is of you check the GPU under Device Manager there‘s something like “Large Memory Pool” (can’t say specifically not at my PC) tho I’ve seen no performance difference so far.

Zach_01 · Jan 27, 2021

SAM is a CPU aid.-
CPUs previously used only a fixed 256MB of GPU's VRAM. Now the CPU can use as much as it can or as much as is available. Thats why we saw this now that GPUs got above 8~10GB of VRAM.
Even if its enabled on a 5700XT (or any 8GB card) it would be useless if the GPU game data already fills the VRAM.

StormLightningSL · Jan 30, 2021

That's great info! I had no idea it worked like this.

So, if i understand correctly, GPUs with more VRAM will benefit more from SAM/BAR resizing. If that is the case, then the 3090 cards will get a huge benefit along with the 6800XT and 6900XT, whereas the 3080 and lower cards may not see such a big bump in performance. I guess the CPU would use the VRAM as cache memory of some sort to speed up the performance of the GPU?

Zach_01 · Jan 30, 2021

Its not as simple though...
Needs board support, GPU drivers support and Game support to fully utilize this feature.
By this (if and when it works) its like having a faster CPU. Also helps GPU if CPU is faster.
I would guess not for all resolutions though. 1080p sure, maybe 1440p too. But for ultra wide and 4K I wouldn't expect much, if nothing at all.

StormLightningSL · Jan 31, 2021

Zach_01 said:
Its not as simple though...
Needs board support, GPU drivers support and Game support to fully utilize this feature.
By this (if and when it works) its like having a faster CPU. Also helps GPU if CPU is faster.
I would guess not for all resolutions though. 1080p sure, maybe 1440p too. But for ultra wide and 4K I wouldn't expect much, if nothing at all.

I guess it is a little more complicated than I thought. Game support can hardly be expected except with new titles. And higher resolutions is where the difference in performance would be useful.

Maybe this is another one of those statistics that don't translate into much performance benefit for those who really need it.

Zach_01 · Jan 31, 2021

In theory it would be more beneficial to CPU demanding gaming. Thats on specific games and lower resolution (1080p) for almost all games. On higher resolutions its the GPU that counts more. At 4K for example SAM would have the least impact. It doesnt matter if the CPU is 3600/10400f or a Ryzen7/9, Core i9.

StormLightningSL · Feb 1, 2021

I understand. Thank you!

System Name	Main Rig
Processor	Ryzen 7 5800X
Motherboard	ASrock X570 Taichi
Cooling	Varies... all the time
Memory	32 GB Corsair Vengance DDR4 3600
Video Card(s)	Gigabyte RX 6900XT
Storage	3 x M.2, 2x SSD, 2 x HDD
Display(s)	Gigabyte M34WQ, M27Q
Case	Lian Li O11 Dynamic
Audio Device(s)	Blue Snowball, Corsair H70i
Power Supply	EVGA 850W
Mouse	Razer Viper Ultimate
Keyboard	Drevo Blademaster Pro
VR HMD	Reverb G2

System Name	New compy
Processor	AMD Ryzen 5800x3D
Motherboard	MSI MPG x570S EDGE MAX WiFi
Cooling	Noctua NH-D15S w. FHP141 + Xigmatek AOS XAF-F1451
Memory	32gb G.Skill Ripjaws V Samsung B-Die Dual Rank F4-4000C16D-32GVKA
Video Card(s)	ASUS TUF GAMING RTX 4070ti
Storage	17tb (8+4tb WD Black HDD's, 2+2+0.5+0.5tb M.2 SSD Drives) + 16tb WD Red Pro backup drive
Display(s)	Alienware AW2518H 24" 240hz, Sony X85K 43" 4k 120hz HDR TV
Case	Thermaltake Core v71
Audio Device(s)	iFi Nano Idsd Le, Creative T20 + T50, Sennheiser HD6Mix
Power Supply	EVGA Supernova G2 1000w
Mouse	Logitech G502 Hero custom w. G900 scroll wheel mod, Rival 3 + Rival 3 wireless, JLab Epic Mouse
Keyboard	Corsair K68 RGB + K70 RGB + K57 RGB Wireless + Logitech G613
Software	Win 10 Pro
Benchmark Scores	https://valid.x86.fr/s2y7ny

System Name	PC on since Aug 2019, 1st CPU R5 3600 + ASUS ROG RX580 8GB >> MSI Gaming X RX5700XT (Jan 2020)
Processor	Ryzen 9 5900X (July 2022), 150W PPT limit, 79C temp limit, CO -9~14
Motherboard	Gigabyte X570 Aorus Pro (Rev1.0), BIOS F37h, AGESA V2 1.2.0.B
Cooling	Arctic Liquid Freezer II 420mm Rev7 with off center mount for Ryzen, TIM: Kryonaut
Memory	2x16GB G.Skill Trident Z Neo GTZN (July 2022) 3600MHz 1.42V CL16-16-16-16-32-48 1T, tRFC:288, B-die
Video Card(s)	Sapphire Nitro+ RX 7900XTX (Dec 2023) 314~465W (387W current) PowerLimit, 1060mV, Adrenalin v24.3.1
Storage	Samsung NVMe: 980Pro 1TB(OS 2022), 970Pro 512GB(2019) / SATA-III: 850Pro 1TB(2015) 860Evo 1TB(2020)
Display(s)	Dell Alienware AW3423DW 34" QD-OLED curved (1800R), 3440x1440 144Hz (max 175Hz) HDR1000, VRR on
Case	None... naked on desk
Audio Device(s)	Astro A50 headset
Power Supply	Corsair HX750i, 80+ Platinum, 93% (250~700W), modular, single/dual rail (switch)
Mouse	Logitech MX Master (Gen1)
Keyboard	Logitech G15 (Gen2) w/ LCDSirReal applet
Software	Windows 11 Home 64bit (v23H2, OSB 22631.3155)

System Name	Gaming Workstation
Processor	AMD Ryzen 5900X @ 4.0 GHz
Motherboard	AsRock X570 Steel Legend
Cooling	DeepCool CASTLE 280EX
Memory	G.Skill Trident Z - 32GB [2 x 16GB] @ 3600MHz C16
Video Card(s)	Sapphire Tri-X R9 290 [waiting to upgrade]
Storage	1 x MSI M480 1TB NVMe [Boot] + 2 x WD 16TB SATA HDD @ Raid1 [Games & Data]
Display(s)	ASUS ROG Swift PG278Q @ 1440p / 120Hz
Case	Deepcool MATREXX 70 3F
Audio Device(s)	Realtek Onboard Sound with Earphones
Power Supply	Cooler Master 850W
Mouse	Logitech G402
Keyboard	Logitech Internet Keyboard Y-SS60 [it's really old, but my fingers reject any other keyboard]
VR HMD	-
Software	Windows 10 Pro 64-bit

System Name	Bro2
Processor	Ryzen 5800X
Motherboard	Gigabyte X570 Aorus Elite
Cooling	Corsair h115i pro rgb
Memory	16GB G.Skill Flare X 3200 CL14 @3800Mhz CL16
Video Card(s)	Powercolor 6900 XT Red Devil 1.1v@2400Mhz
Storage	M.2 Samsung 970 Evo Plus 500MB/ Samsung 860 Evo 1TB
Display(s)	LG 27UD69 UHD / LG 27GN950
Case	Fractal Design G
Audio Device(s)	Realtec 5.1
Power Supply	Seasonic 750W GOLD
Mouse	Logitech G402
Keyboard	Logitech slim
Software	Windows 10 64 bit

System Name	Hellbox 5.1(same case new guts)
Processor	Ryzen 7 5800X3D
Motherboard	MSI X570S MAG Torpedo Max
Cooling	TT Kandalf L.C.S.(Water/Air)EK Velocity CPU Block/Noctua EK Quantum DDC Pump/Res
Memory	2x16GB Gskill Trident Neo Z 3600 CL16
Video Card(s)	Powercolor Hellhound 7900XTX
Storage	970 Evo Plus 500GB 2xSamsung 850 Evo 500GB RAID 0 1TB WD Blue Corsair MP600 Core 2TB
Display(s)	Alienware QD-OLED 34” 3440x1440 144hz 10Bit VESA HDR 400
Case	TT Kandalf L.C.S.
Audio Device(s)	Soundblaster ZX/Logitech Z906 5.1
Power Supply	Seasonic TX~’850 Platinum
Mouse	G502 Hero
Keyboard	G19s
VR HMD	Oculus Quest 2
Software	Win 10 Pro x64

Resizable BAR / SAM for Ryzen 3000 - ASROCK X570 Taichi

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