NVIDIA PCI-Express Resizable BAR Performance Test

[W1zzard]

PCI-Express Resizable BAR, pioneered by AMD, seems to be a magic bullet for unlocking additional double-digit FPS gains. NVIDIA finally released their implementation for GeForce Ampere cards. In our PCIe BAR review, we test the feature on RTX 3090, 3080, 3070, and 3060 Ti in 22 games, at Full HD, 1440p, and 4K.

Show full review

 

[Ravenlord]

Good addition for non-existing hardware. Many minor features makes difference in performance at all, so keep adding more..

 

[TheoneandonlyMrK]

Not bad seems a bit pointless to care about ATM though.
One thing though, at the end you say AMD were lucky, it's not luck if you plan an introduction of a new technology and implement it well, before the competition, luck isn't involved.
Still,
Wouldn't make me buy, or not , even if I could that is, the gains are minimal.

 

[Xuper]

AMD wants to sell you the overpriced Ryzen 9 5900X.The 5800X is actually the faster processor for gaming,due to its CCD design, and much more affordable, too.

lol

 

[Camm]

Umm, did I miss somewhere in the article that you got around the profile limitation for Resizeable Bar?

https://www.nvidia.com/en-us/geforc...&ranSiteID=TnL5HPStwNw-M0kzgbvCZtWOGggallYRLw

“Game Ready Driver Update
In practice, the performance benefits of Resizable BAR can vary substantially from game to game. In our testing, we’ve found some titles benefit from a few percent, up to 12%. However, there are also titles that see a decrease in performance, so NVIDIA will be pre-testing titles and using game profiles to enable Resizable BAR only when it has a positive performance impact. That way you won’t have to worry about bugs or performance decreases, and won’t have to rely on the community to benchmark each title and discover whether Resizable BAR is beneficial in the games you’re playing.”

 

[Deleted member 50521]

Yeah free new features. Too bad my X99 wont be able to enjoy that

 

[AsRock]

Not bad seems a bit pointless to care about ATM though.
One thing though, at the end you say AMD were lucky, it's not luck if you plan an introduction of a new technology and implement it well, before the competition, luck isn't involved.
Still,
Wouldn't make me buy, or not , even if I could that is, the gains are minimal.

Maybe when games are designed to use it we might see better performance ?, but like every thing else it's going to take time.

As you said time will tell, Going be like the CPU threads used to be.

 

[W1zzard]

Umm, did I miss somewhere in the article that you got around the profile limitation for Resizeable Bar?

No? I just tested all my games

 

[SL2]

Resizable BAR, such confusing words. Just as logical as Double DR, Random AM, Basic IOS, Advanced MRAAM, Situation NAFU, Senatus PQR..

"No, we can't abbreviate Resizable, but everyone knows what BAR means"

Before you shoot me down, I know, the BAR in this context is older than Resizable BAR.
How about just R-BAR?

 

[Ja.KooLit]

Resizable BAR, such confusing words. Just as logical as Double DR, Random AM, Basic IOS, Advanced MRAAM, Situation NAFU, Senatus PQR..

"No, we can't abbreviate Resizable, but everyone knows what BAR means"

Before you shoot me down, I know, the BAR in this context is older than Resizable BAR.
How about just R-BAR?

Wizz actually put SAM in his conclusion. (2nd sentence last paragraph)

 

[RH92]

Thanks for the nice review W1zzard . At the end of the day 2-4% on average is not a game changer but obviously it's always good to take especialy given it comes for free . I believe there is not much else to say other than this .

 

[SL2]

Wizz actually put SAM in his conclusion. (2nd sentence last paragraph)

Sorry, I meant just in general. You can see "Resizable BAR" everywhere, and after a while it gets silly, just like my made up examples.

 

[W1zzard]

How about just R-BAR?

Not a lot of Google results for it, slightly more for ReBAR, not enough to make me switch

Wizz actually put SAM in his conclusion. (2nd sentence last paragraph)

Whoops, lol, fixed

 

[Ravenmaster]

Wel that went down like a led balloon. 1 FPS difference with RE BAR on... pfff

 

[efikkan]

“…there are also titles that see a decrease in performance, so NVIDIA will be pre-testing titles and using game profiles to enable Resizable BAR only when it has a positive performance impact. That way you won’t have to worry about bugs or performance decreases, and won’t have to rely on the community to benchmark each title and discover whether Resizable BAR is beneficial in the games you’re playing.”

I don't mind a little bit of free performance, even if it's just a little bit.
But what worries me is what kind of complexity they added to achieve this.
Even more so, if that quote is accurate, they should rather have made it an API call to enable it, instead of some whitelisting. That phrasing there makes me as a programmer worried about the reliability of this feature.

 

[TheLostSwede]

Not a lot of Google results for it, slightly more for ReBAR, not enough to make me switch

ReBAR seems top bring up a lot of results...

 

[mechtech]

ReBAR seems top bring up a lot of results...

mmmmmmmmmmm love me some reinforcing bar................well the civil guys like it in their concrete anyway

 

[BigMack70]

Good stuff. Free performance is always a win. I didn't have any trouble updating my z390 / 3080 founders setup to use the new feature even though Nvidia's site didn't specify z390 as compatible.

 

[nguyen]

noice, 4K is the resolution that need every single FPS and seems like Resizeable Bar works best at 4K too.
If Nvidia had include the option to toggle Resizeable Bar On/Off per game profile then this would be a superior approach AMD one, where you need to go to BIOS to disable SAM just so you don't get performance regression in certain game.

 

[Transient Gamer]

Very nice Wizzard, as always. I flashed my Asus 3070 TUF OC with my eyes closed, not kidding and hey it worked! GPU-Z is a quick and easy way to confirm too! I really appreciate your coverage in those BAR supported titles. Is the 99% and/or 99.9% lows have improved to the same percentage as the FPS?
I mean that difference in FPS is telling, but do you believe it is the same story proportionally on the frametime analysis front? Maybe the story is even better or the same?
Your thoughts?

 

[Redkaliber]

Thanks Nvidia, I'm sure the miners will make great use of these new features!

 

[Metroid]

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.

 

[R00kie]

Is the 99% and/or 99.9% lows have improved to the same percentage as the FPS?

This.

AVG fps is good and all, but it isn't the full picture.

 

[Deleted member 205776]

Honestly, after enabling ReBar on my system, my games feel noticeably smoother. And it's not placebo.

 

[Chane]

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.