• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

NVIDIA PCI-Express Resizable BAR Performance Test

Joined
Feb 1, 2019
Messages
2,515 (1.34/day)
Location
UK, Leicester
System Name Main PC
Processor 13700k
Motherboard Asrock Z690 Steel Legend D4 - Bios 13.02
Cooling Noctua NH-D15S
Memory 32 Gig 3200CL14
Video Card(s) 3080 RTX FE 10G
Storage 1TB 980 PRO (OS, games), 2TB SN850X (games), 2TB DC P4600 (work), 2x 3TB WD Red, 2x 4TB WD Red
Display(s) LG 27GL850
Case Fractal Define R4
Audio Device(s) Asus Xonar D2X
Power Supply Antec HCG 750 Gold
Software Windows 10 21H2 LTSC
Similar to my own testing, I have been testing mainly dx9/dx11 stuff since all the reviewers mostly focus on dx12.

I also tested 3dmark timespy.

My conclusion is the majority of stuff gets 0-2% benefit.

Also I have discovered having REBAR enabled on the system, even if its disabled in the game, there is a very small overhead, its small maybe about 0.5 to 1%. Usually the REBAR gain (if enabled in inspector) will cancel it out. So the net gain over a system with REBAR disabled is actually closer to 0-0.5%.

I will speculate since this feature was planned by AMD, they likely contacted some game dev's had some optimisation done and hence we have a bunch of new titles with decent gains (that can showcased by reviewers) whilst most other titles is barely anything at all. In that respect its kind of like DLSS, benefits newer stuff but not older stuff.
 
Joined
Jun 10, 2014
Messages
2,889 (0.81/day)
Processor AMD Ryzen 9 5900X ||| Intel Core i7-3930K
Motherboard ASUS ProArt B550-CREATOR ||| Asus P9X79 WS
Cooling Noctua NH-U14S ||| Be Quiet Pure Rock
Memory Crucial 2 x 16 GB 3200 MHz ||| Corsair 8 x 8 GB 1333 MHz
Video Card(s) MSI GTX 1060 3GB ||| MSI GTX 680 4GB
Storage Samsung 970 PRO 512 GB + 1 TB ||| Intel 545s 512 GB + 256 GB
Display(s) Asus ROG Swift PG278QR 27" ||| Eizo EV2416W 24"
Case Fractal Design Define 7 XL x 2
Audio Device(s) Cambridge Audio DacMagic Plus
Power Supply Seasonic Focus PX-850 x 2
Mouse Razer Abyssus
Keyboard CM Storm QuickFire XT
Software Ubuntu
Also I have discovered having REBAR enabled on the system, even if its disabled in the game, there is a very small overhead, its small maybe about 0.5 to 1%. Usually the REBAR gain (if enabled in inspector) will cancel it out. So the net gain over a system with REBAR disabled is actually closer to 0-0.5%.

I will speculate since this feature was planned by AMD, they likely contacted some game dev's had some optimisation done and hence we have a bunch of new titles with decent gains (that can showcased by reviewers) whilst most other titles is barely anything at all. In that respect its kind of like DLSS, benefits newer stuff but not older stuff.
Anything this low level isn't controlled directly by the game engines, this is all done by the graphics drivers.

I am worried though, if any of them (AMD or Nvidia) added workarounds in their drivers for specific games. Such "optimizations" are never a good idea, they add complexity to drivers, potential bugs, and generally adds to driver overhead.
 
Joined
Aug 17, 2017
Messages
274 (0.11/day)
"but most motherboard vendors for whatever reason restricted their Resizable BAR enabling BIOS updates to the 300-series chipset, or 8th Gen "Coffee Lake" (and later)"

maybe these motherboard vendors bought amd shares at the time. after all, that seems like intentional performance restriction, why else would they choose to restrict Intel's performance?
 
Joined
Dec 16, 2012
Messages
540 (0.13/day)
Processor AMD Ryzen R7 5800x
Motherboard B550i Aorus Pro AX
Cooling Custom Cooling
Memory 32Gb Patriot Viper 3600 RGB
Video Card(s) MSI RTX 3080 Ventus Trio OC
Storage Samsung 960 EVO
Display(s) Specterpro 34uw100
Case SSUPD Meshlicious
Power Supply Cooler Master V750 Gold SFX
Mouse Glorious Model D Wireless
Keyboard Ducky One 2
VR HMD Quest 2
Software Windows 11 64bit
Enabling ReBAR on my system brought out some instability I didn't know I had when playing Cyberpunk. I guess thanks ReBAR for helping me realize my infinity fabric overclock wasn't stable. Now that everything is working it does feel a little bit better to play, but that could also be the Cyberpunk 1.2 patch that came out. Oh well, happy to get any little bit of performance I can.
I've been seeing posts in reddit about this. Basically, if you have your OC pushed to the limit and stable and you enable ReBar - you have to dial your OC a notch to make it stable.
 
Joined
Sep 9, 2015
Messages
260 (0.08/day)
Enabling ReBAR on my system brought out some instability I didn't know I had when playing Cyberpunk. I guess thanks ReBAR for helping me realize my infinity fabric overclock wasn't stable. Now that everything is working it does feel a little bit better to play, but that could also be the Cyberpunk 1.2 patch that came out. Oh well, happy to get any little bit of performance I can.
Same exact experience here as well - I went from 1900 to 1866mhz to correct it.
 
Joined
Jan 11, 2011
Messages
8 (0.00/day)
Location
Saint-Petersburg
System Name 16 digit calculator
Processor AMD 5900X @ STOCK /PBO OFF /OFFSET -0.10V
Motherboard ASUS B550F WIFI
Cooling DARK ROCK4 PRO
Memory G.SKILL RIPJAWS V 32GB (16GB*2)@3600 CL16
Video Card(s) RTX 3090 AORUS EXTREME /POWERLIMIT 100 /CORE+100 /WITH EXTRA BACKPLATE HEATSINK
Storage NVME 1Tb P34A80 SiliconPower / SATA 10TB TOSHIBA HD11WR / SATA 8TB HITACHI / SATA 6TB TOSHIBA
Display(s) ASUS VG27AQ 2560*1440p@165hz
Case Fractal Design, Define XL R2 /6x140mm FANS. This RTX3090 Heat... Ohh...
Audio Device(s) Asus Xonar Phoebus PCI express
Power Supply 850W Corsair
Mouse Logitech G603 WIRELESS
Keyboard Logitech K270 WIRELESS
Software OS: Win 10 x64 bit ver.20h2 or better Games: TETRIS 3D with raytracing :)
Benchmark Scores Can I play daddy? :)
Great review, thanks!
 
Joined
Feb 20, 2021
Messages
311 (0.27/day)
System Name Office,Home and Game PC
Processor Intel Core i5 12600k Up to 4.9 GHz
Motherboard Z690 Gaming X Gigabyte DDR4 Version
Cooling Fuma 2 Air Cooler
Memory 32GB DDR4 2x16 3600 MHz Patriot Viper Steel RAM
Video Card(s) NVIDIA GeForce GTX 1080 and RTX 3070
Storage 512 GB M2 PCI Ex 3.0 NVMe SX6000 Pro, 1TB NV2 Kingston M2 PCI Ex 4.0 and 4TB WD Blue SATA 3.0 HDD
Display(s) 27 inç 75 Hz LG
Case Cooler Master MB511
Audio Device(s) Creative 2+1
Power Supply 750W 80+ Bronze PSU High Power Element
Mouse Logitech Wireless
Keyboard Microsoft
VR HMD N/A
Software Windows 10-11
Every performance increase from free is good. But it has increased a little.
 
Joined
Mar 17, 2011
Messages
159 (0.03/day)
Location
Christchurch, New Zealand
Well, it was interesting to learn that even the Haswell CPU supports ReBAR in hardware. So it's a matter of firmware and microcode support limiting the availability of ReBAR.
 
Last edited:

Xenom

New Member
Joined
Jan 14, 2019
Messages
2 (0.00/day)
A tech that will be useable to the general person in 2-5 years when the cards are available :)
 

qubit

Overclocked quantum bit
Joined
Dec 6, 2007
Messages
17,866 (3.00/day)
Location
Quantum Well UK
System Name Quantumville™
Processor Intel Core i7-2700K @ 4GHz
Motherboard Asus P8Z68-V PRO/GEN3
Cooling Noctua NH-D14
Memory 16GB (2 x 8GB Corsair Vengeance Black DDR3 PC3-12800 C9 1600MHz)
Video Card(s) MSI RTX 2080 SUPER Gaming X Trio
Storage Samsung 850 Pro 256GB | WD Black 4TB | WD Blue 6TB
Display(s) ASUS ROG Strix XG27UQR (4K, 144Hz, G-SYNC compatible) | Asus MG28UQ (4K, 60Hz, FreeSync compatible)
Case Cooler Master HAF 922
Audio Device(s) Creative Sound Blaster X-Fi Fatal1ty PCIe
Power Supply Corsair AX1600i
Mouse Microsoft Intellimouse Pro - Black Shadow
Keyboard Yes
Software Windows 10 Pro 64-bit
Wow, makes a real difference at 1080p, not so much at 4K where hard performance limitations of the graphics card, like fill rate, have a bigger effect. Worth having if you can get it, though. My next rig will be built with this in mind. Should be standard by then, anyway.

Great review W1z, as always. :cool:
 

Yopis

New Member
Joined
Apr 3, 2021
Messages
1 (0.00/day)
This test was a fail. at least for Red Dead if you actually play the game then you'll see that the performance increases a lot larger this is one of the things that people have figured out that reviewers that didn't take any time except running The in-game benchmark didn't realize try it again actually playing the game in the same spot and you'll see market improvement and 1% lows and regular frame rate I'm seeing five to six frame increase a lot larger than the in-game benchmark shows me don't be lazy and actually try the game as well. I'm referring to 4k.


I dont think 2% will make people wanting it that badly, if it was 10% then it would be a different story. Thanks for the tests @wizard.
The test were flawed.
 
Joined
Apr 12, 2013
Messages
6,728 (1.68/day)
I will speculate since this feature was planned by AMD
Or maybe it has something to do with that software scheduler thing & actually better planning from AMD in the past?

why else would they choose to restrict Intel's performance?
You're kidding right? You remember the last BIOS updates for Haswell/Broadwell gen boards? No(?) ~ it was for smeltdown & probably only because Intel forced them to! You think board makers will update BIOSes for boards released 5-7 years back? It's not like they can be used for CPUs released even 2 years back, unlike AMD & AM4. You're almost funny, if not for the pathetic thing Intel does forcing users to update mobos nearly each year!
 
Joined
Aug 15, 2016
Messages
486 (0.17/day)
Processor Intel i7 4770k
Motherboard ASUS Sabertooth Z87
Cooling BeQuiet! Shadow Rock 3
Memory Patriot Viper 3 RedD 16 GB @ 1866 MHz
Video Card(s) XFX RX 480 GTR 8GB
Storage 1x SSD Samsung EVO 250 GB 1x HDD Seagate Barracuda 3 TB 1x HDD Seagate Barracuda 4 TB
Display(s) AOC Q27G2U QHD, Dell S2415H FHD
Case Cooler Master HAF XM
Audio Device(s) Magnat LZR 980, Razer BlackShark V2, Altec Lansing 251
Power Supply Corsair AX860
Mouse Razer DeathAdder V2
Keyboard Razer Huntsman Tournament Edition
Software Windows 10 Pro x64
If this was supposed to be marketing for the GPU, why even release it now? By the time GPUs get available again, no one will remember Resizable BAR. Especially with such small improvements on select titles, it's important as much as Raytracing is.
 
Joined
Apr 19, 2018
Messages
957 (0.44/day)
Processor AMD Ryzen 9 5950X
Motherboard Asus ROG Crosshair VIII Hero WiFi
Cooling Arctic Liquid Freezer II 420
Memory 32Gb G-Skill Trident Z Neo @3806MHz C14
Video Card(s) MSI GeForce RTX2070
Storage Seagate FireCuda 530 1TB
Display(s) Samsung G9 49" Curved Ultrawide
Case Cooler Master Cosmos
Audio Device(s) O2 USB Headphone AMP
Power Supply Corsair HX850i
Mouse Logitech G502
Keyboard Cherry MX
Software Windows 11
Thanks w1zzard.
 
Joined
Mar 10, 2010
Messages
11,878 (2.31/day)
Location
Manchester uk
System Name RyzenGtEvo/ Asus strix scar II
Processor Amd R5 5900X/ Intel 8750H
Motherboard Crosshair hero8 impact/Asus
Cooling 360EK extreme rad+ 360$EK slim all push, cpu ek suprim Gpu full cover all EK
Memory Corsair Vengeance Rgb pro 3600cas14 16Gb in four sticks./16Gb/16GB
Video Card(s) Powercolour RX7900XT Reference/Rtx 2060
Storage Silicon power 2TB nvme/8Tb external/1Tb samsung Evo nvme 2Tb sata ssd/1Tb nvme
Display(s) Samsung UAE28"850R 4k freesync.dell shiter
Case Lianli 011 dynamic/strix scar2
Audio Device(s) Xfi creative 7.1 on board ,Yamaha dts av setup, corsair void pro headset
Power Supply corsair 1200Hxi/Asus stock
Mouse Roccat Kova/ Logitech G wireless
Keyboard Roccat Aimo 120
VR HMD Oculus rift
Software Win 10 Pro
Benchmark Scores 8726 vega 3dmark timespy/ laptop Timespy 6506
If this was supposed to be marketing for the GPU, why even release it now? By the time GPUs get available again, no one will remember Resizable BAR. Especially with such small improvements on select titles, it's important as much as Raytracing is.
I get your point, but definitely disagree on how important it is, Raytracing is over hyped at the moment(IMHO) and this isn't anywhere near as important to performance or the end game Feel or look.
 
Joined
May 24, 2007
Messages
5,401 (0.88/day)
Location
Tennessee
System Name AM5
Processor AMD Ryzen R9 7950X
Motherboard Asrock X670E Taichi
Cooling EK AIO Basic 360
Memory Corsair Vengeance DDR5 5600 64 Gb - XMP1 Profile
Video Card(s) AMD Reference 7900 XTX 24 Gb
Storage Samsung Gen 4 980 1 TB / Samsung 8TB SSD
Display(s) Samsung 34" 240hz 4K
Case Fractal Define R7
Power Supply Seasonic PRIME PX-1300, 1300W 80+ Platinum, Full Modular
MSI hasn't offered a BIOS update to their X570 MSI ACE MEG board yet. Only for SAM.
 
Joined
Mar 11, 2019
Messages
285 (0.15/day)
You can use NVIDIA Profile Inspector to modify Resizable BAR game support settings. Credit goes to @chrcoluk.


:rolleyes: yeah because i didn't already post this info to TPU 4 weeks ago or anything.

Or maybe it has something to do with that software scheduler thing & actually better planning from AMD in the past?

Oh, ffs, please don't cite anyone about the bloody scheduler, the only thing nvidia removed was the data hazard block leaving instruction dispatch up th the compiler, the rest of the bloody scheduler is still hardware based.

I would love to punch Ian in the face for misrepresenting what he was told in the kepler review all those years ago.

Enabling ReBAR on my system brought out some instability I didn't know I had when playing Cyberpunk. I guess thanks ReBAR for helping me realize my infinity fabric overclock wasn't stable. Now that everything is working it does feel a little bit better to play, but that could also be the Cyberpunk 1.2 patch that came out. Oh well, happy to get any little bit of performance I can.

If you find any games get stuttery, you can thank Ryzens poor grading of IO dies and the numerous cpu's that spam the pcie controller with errors.
 
Last edited:
Joined
Nov 19, 2019
Messages
103 (0.06/day)
Anyone seeing
Similar to my own testing, I have been testing mainly dx9/dx11 stuff since all the reviewers mostly focus on dx12.

I also tested 3dmark timespy.

My conclusion is the majority of stuff gets 0-2% benefit.

Also I have discovered having REBAR enabled on the system, even if its disabled in the game, there is a very small overhead, its small maybe about 0.5 to 1%. Usually the REBAR gain (if enabled in inspector) will cancel it out. So the net gain over a system with REBAR disabled is actually closer to 0-0.5%.

I will speculate since this feature was planned by AMD, they likely contacted some game dev's had some optimisation done and hence we have a bunch of new titles with decent gains (that can showcased by reviewers) whilst most other titles is barely anything at all. In that respect its kind of like DLSS, benefits newer stuff but not older stuff.
Did you see an improvement in timespy?

I tried it today, and the GPU portion was basically within margin of error, but my cpu score dropped a bit when I used profile inspector to enable it.

The one game I tried forcing it on for showed zero difference. It's an older dx11 architecture and doesn't use a huge amount of memory.
 
Joined
Nov 11, 2016
Messages
3,045 (1.13/day)
System Name The de-ploughminator Mk-II
Processor i7 13700KF
Motherboard MSI Z790 Carbon
Cooling ID-Cooling SE-226-XT + Phanteks T30
Memory 2x16GB G.Skill DDR5 7200Cas34
Video Card(s) Asus RTX4090 TUF
Storage Kingston KC3000 2TB NVME
Display(s) LG OLED CX48"
Case Corsair 5000D Air
Power Supply Corsair HX850
Mouse Razor Viper Ultimate
Keyboard Corsair K75
Software win11
Anyone seeing
Did you see an improvement in timespy?

I tried it today, and the GPU portion was basically within margin of error, but my cpu score dropped a bit when I used profile inspector to enable it.

The one game I tried forcing it on for showed zero difference. It's an older dx11 architecture and doesn't use a huge amount of memory.

Try console ported games, the idea behind Resizeable Bar or SAM is because console CPU have direct access to VRAM after all.
Games that are made on PC originally are unlikely to gain much from Re-Bar or SAM
 
Joined
May 8, 2018
Messages
1,494 (0.69/day)
Location
London, UK
MSI hasn't offered a BIOS update to their X570 MSI ACE MEG board yet. Only for SAM.

I have that msi b450 gaming plus and I can confirm it got a bios for it and in the bios there is an option to enable rebar, however I have not done the test yet to confirm if it works with the 3xxx series, i have a 3080 but not using as main gpu right now, I'm using a gtx 1070 as main and rebar does not work with pascal yet, yeah only 3xxx series but like i said i have to confirm it.
 
Joined
Feb 1, 2019
Messages
2,515 (1.34/day)
Location
UK, Leicester
System Name Main PC
Processor 13700k
Motherboard Asrock Z690 Steel Legend D4 - Bios 13.02
Cooling Noctua NH-D15S
Memory 32 Gig 3200CL14
Video Card(s) 3080 RTX FE 10G
Storage 1TB 980 PRO (OS, games), 2TB SN850X (games), 2TB DC P4600 (work), 2x 3TB WD Red, 2x 4TB WD Red
Display(s) LG 27GL850
Case Fractal Define R4
Audio Device(s) Asus Xonar D2X
Power Supply Antec HCG 750 Gold
Software Windows 10 21H2 LTSC
Anyone seeing
Did you see an improvement in timespy?

I tried it today, and the GPU portion was basically within margin of error, but my cpu score dropped a bit when I used profile inspector to enable it.

The one game I tried forcing it on for showed zero difference. It's an older dx11 architecture and doesn't use a huge amount of memory.
yes but its tiny, basically it cancelled out the bios overheads.
 
Joined
Sep 15, 2011
Messages
6,457 (1.41/day)
Processor Intel® Core™ i7-13700K
Motherboard Gigabyte Z790 Aorus Elite AX
Cooling Noctua NH-D15
Memory 32GB(2x16) DDR5@6600MHz G-Skill Trident Z5
Video Card(s) ZOTAC GAMING GeForce RTX 3080 AMP Holo
Storage 2TB SK Platinum P41 SSD + 4TB SanDisk Ultra SSD + 500GB Samsung 840 EVO SSD
Display(s) Acer Predator X34 3440x1440@100Hz G-Sync
Case NZXT PHANTOM410-BK
Audio Device(s) Creative X-Fi Titanium PCIe
Power Supply Corsair 850W
Mouse Logitech Hero G502 SE
Software Windows 11 Pro - 64bit
Benchmark Scores 30FPS in NFS:Rivals
Wait, except for the driver, you also have to re-flash your GPU, not only your Mobo????
 

W1zzard

Administrator
Staff member
Joined
May 14, 2004
Messages
26,956 (3.71/day)
Processor Ryzen 7 5700X
Memory 48 GB
Video Card(s) RTX 4080
Storage 2x HDD RAID 1, 3x M.2 NVMe
Display(s) 30" 2560x1600 + 19" 1280x1024
Software Windows 10 64-bit
Wait, except for the driver, you also have to re-flash your GPU, not only your Mobo????
Correct, and you might have to reinstall Windows or MBR2GPT
 
Top