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ASUS, Asrock, and Biostar Have Enabled Resizable BAR On Their Z490 Motherboards

Random_Person1234
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Summary

ASUS has released a new BIOS on their Z490 motherboards that enables Resizable BAR (also known as "Smart Access Memory"). Japanese website ASCII has benchmarked Resizable BAR with an i9-10900K, RX 6800XT reference, and ASUS ROG Maximus XII EXTREME featuring the new 1002 firmware.

Benchmark graphs (I'm assuming the bottom bars are SAM off, and the top bars are SAM on):

Spoiler

image.png.ceea799465e9641128936e9d6ffd5f51.png

image.png.38af48775da23b33a98cbe0d0f9d8739.png

image.png.cfc50bf579d9a6fe99ba0d8b07a8a5b2.png

image.png.21e892c8a306918abe6784f3852ed79c.png

 

Edit: As @Hymenopus_Coronatus has said, Asrock has released their implementation of Resizable BAR, called CAM ("Clever Access Memory"), on all their Z490 motherboards.

Benchmarks of CAM with an i7-10700K, RX 6800XT, and Asrock Z490 Taichi (Source: Wccftech😞

Spoiler

image.png.5729a8654de08f9300bf239008a51980.png

Quotes

Quote

With the ASUS ROG Maximus XII EXTREME featuring 1002 firmware (released on November 27th), the ASCII editor was able to enable the Re-Size Bar feature in the Advanced Tab in the motherboard’s BIOS.

Quote

The editor is using Intel Core i9-10900K processors and Radeon RX 6800 XT reference model with the feature enabled and then disabled to see if there are any improvements. It is worth noting that SAM does not always bring a noticeable performance boost, even on the Ryzen 5000/Radeon 6000 platform. That said, the editor only tested the games where SAM is proven to provide such a boost: Assassin’s Creed Valhalla, Forza Horizon 4, Red Dead Redemption 2, and Rainbow Six Siege.

My thoughts

This proves that AMD Smart Access Memory is nothing special, and you don't need a Zen 3 CPU and 500 series motherboard to use it (this was pretty obvious). Overall, it's a nice feature to gain a bit of FPS, with the gains in minimum FPS pretty substantial. 

 

Sources

https://videocardz.com/newz/amd-radeon-rx-6800xt-sees-performance-boost-on-intel-z490-with-resizable-bar-enabled

https://ascii.jp/elem/000/004/036/4036051/

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glad it's rolling out

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X370 support when 😭

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I wonder when BAR will be on for non RX 6000 cards on these platforms. Would be nice to get BAR support for GTX 1080Ti given we won't have access to the latest cards for months to come... I am getting X570 so I'm good on that front, just not on the graphic card front...

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35 minutes ago, RejZoR said:

I wonder when BAR will be on for non RX 6000 cards on these platforms. Would be nice to get BAR support for GTX 1080Ti given we won't have access to the latest cards for months to come... I am getting X570 so I'm good on that front, just not on the graphic card front...

That makes me wonder what is required to have BAR support on GPU? Is it a GPU firmware feature, or can it be enabled in driver? If it could be updated through driver that would be great. If it requires individual card firmware, that could significantly reduce the chances of it happening on older cards.

 

Edit: sounds like nvidia will enable 30-series support in driver, but no word on older generations.

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23 minutes ago, porina said:

That makes me wonder what is required to have BAR support on GPU? Is it a GPU firmware feature, or can it be enabled in driver? If it could be updated through driver that would be great. If it requires individual card firmware, that could significantly reduce the chances of it happening on older cards.

 

Edit: sounds like nvidia will enable 30-series support in driver, but no word on older generations.

I think PCIE gen4 it got added.  not 100% sure though

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5 minutes ago, GDRRiley said:

I think PCIE gen4 it got added.  not 100% sure though

Gen 4 is unrelated to resizeable BAR support. Many Z490 boards were designed with 4.0 support in preparation for Rocket Lake to actually use it.

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35 minutes ago, porina said:

Edit: sounds like nvidia will enable 30-series support in driver, but no word on older generations.

I feel the industry has been holding out. If BAR enables that kind of a performance boost, why in the hell is it now being enabled? Was this a buffer in case performance gains were running dry? Oh but look AMD has a super-special feature, and finally the cat was out of the bag of what it really was. So Intel and Nvidia was mum about it, and AMD passed it off like it was their own. 

 

I'm calling shenanigans. 😡

 

Feeling miffed.

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12 minutes ago, StDragon said:

I feel the industry has been holding out. If BAR enables that kind of a performance boost, why in the hell is it now being enabled? Was this a buffer in case performance gains were running dry? Oh but look AMD has a super-special feature, and finally the cat was out of the bag of what it really was. So Intel and Nvidia was mum about it, and AMD passed it off like it was their own. 

 

I'm calling shenanigans. 😡

 

Feeling miffed.

Probably just usual business reasons. It costs money to implement, and requires the support of hardware/firmware, drivers, OS. AMD were the first to be in a position to implement it well with a push from MS, and that opened the gates. Now nvidia and Intel have to do it to keep up. Short term advantage to AMD, and they get the credit for pushing it, but long term we all get it.

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26 minutes ago, porina said:

Probably just usual business reasons. It costs money to implement, and requires the support of hardware/firmware, drivers, OS. 

It is now after the fact, sure. But it was part of the PCIe spec to begin with 3.0 specifications, no? It's one of many features to the standard. I'm blown away that it's only now starting to be utilized.

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2 minutes ago, StDragon said:

It is now after the fact, sure. But it was part of the PCIe spec to begin with 3.0 specifications, no? It's one of many features to the standard. I'm blown away that it's only now starting to be utilized.

It is normal for standards to contain mandatory features that everyone has to support, and optional features. You can guess where this feature fits in.

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I'm going to be livid if they(AMD) don't make it available on ryzen 3000 series when everyone and their dog is getting it

-sigh- feeling like I'm being too negative lately

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7 hours ago, Random_Person1234 said:

Summary

ASUS has released a new BIOS on their Z490 motherboards that enables Resizable BAR (also known as "Smart Access Memory"). Japanese website ASCII has benchmarked Resizable BAR with an i9-10900K, RX 6800XT reference, and ASUS ROG Maximus XII EXTREME featuring the new 1002 firmware.

Benchmark graphs (I'm assuming the bottom bars are SAM off, and the top bars are SAM on):

  Hide contents

image.png.ceea799465e9641128936e9d6ffd5f51.png

image.png.38af48775da23b33a98cbe0d0f9d8739.png

image.png.cfc50bf579d9a6fe99ba0d8b07a8a5b2.png

image.png.21e892c8a306918abe6784f3852ed79c.png

 

 

Quotes

My thoughts

This proves that AMD Smart Access Memory is nothing special, and you don't need a Zen 3 CPU and 500 series motherboard to use it (this was pretty obvious). Overall, it's a nice feature to gain a bit of FPS, with the gains in minimum FPS pretty substantial. 

 

Sources

https://videocardz.com/newz/amd-radeon-rx-6800xt-sees-performance-boost-on-intel-z490-with-resizable-bar-enabled

https://ascii.jp/elem/000/004/036/4036051/

Not being able to read Japanese it’s hard to have an opinion.  The top graphs in the 3 examples appear to be longer but I don’t know if that is even good or bad.

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4 minutes ago, Bombastinator said:

Not being able to read Japanese it’s hard to have an opinion.  The top graphs in the 3 examples appear to be longer but I don’t know if that is even good or bad.

Google Translate is useful. Link below.

 

https://translate.google.com/translate?sl=ja&tl=en&u=https://ascii.jp/elem/000/004/036/4036051/

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Rather nice and practically free performance-boosts? Nice, definitely. Too bad I won't be getting resizeable BAR on my Z370-mobo 😭

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CORRECTION: It appears the benchmark of Forza Horizon 4 on the ASUS motherboard is in 2560 x 1440, not 1920 x 1080. The reviewer choose to test this one game in 1440p due to a significant CPU bottleneck at 1080p. 

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Asrock has released a BIOS update for the Z490 Taichi.

 

Here's the headline feature: "add C.A.M. (Clever Access Memory) function.". The naming is just pure gold 😂

 

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17 hours ago, porina said:

That makes me wonder what is required to have BAR support on GPU? Is it a GPU firmware feature, or can it be enabled in driver? If it could be updated through driver that would be great. If it requires individual card firmware, that could significantly reduce the chances of it happening on older cards.

 

Edit: sounds like nvidia will enable 30-series support in driver, but no word on older generations.

OS and GPU driver is all that's required to use it. The BIOS update requires for Windows to use it seems to be a Windows issue that has to be addressed.

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Now if Intel brings it to their X299 platform, that would be nice. 🙂

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Should be noted that we can probably expect this to show up on most boards in released in the last 1-2 years. It's really just a matter of testing. It's also a matter of a game (or other VRAM heavy application) being responsive to the change.

 

This is a bit less of AMD pushing the bar (har har) and more of them putting pressure on MS to address some issues with Windows. 

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18 hours ago, SlimyPython said:

his cats?

 

actually does he still have cats?

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19 hours ago, StDragon said:

I feel the industry has been holding out. If BAR enables that kind of a performance boost, why in the hell is it now being enabled? Was this a buffer in case performance gains were running dry? Oh but look AMD has a super-special feature, and finally the cat was out of the bag of what it really was. So Intel and Nvidia was mum about it, and AMD passed it off like it was their own. 

 

I'm calling shenanigans. 😡

 

Feeling miffed.

I don't think it's that simple. Until recently, VRAM never really exceeded 8GB for most gaming cards, and games didn't use that much of it. Resizable BAR / SAM only really makes sense when moving a lot of data around from what I can tell (fewer "bank switches"), so its effects would have been limited and not really worth the effort in previous generations. This is exemplified in the fact that not every title sees a big benefit from it.

 

My take on it is that AMD took the initiative here after seeing what devs were doing with the Xbox Series and PS5 consoles, and now everyone else has to catch up. In the end, it'll have been a short-lived gimmick that gave them an advantage over Nvidia, similar to how "RTX" gave Nvidia an early advantage in ray tracing despite it also being a standard thing in both DirectX and Vulkan.

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