Resizable BAR Tested with Intel - The Power of Boosted Memory Access

Conclusion

Resizable BAR Tested with Intel - The Power of Boosted Memory Access

Conclusion - Resizable BAR is coming to all of the latest PC hardware

Resizable BAR support has the potential to have a transformative impact on PC gaming, giving developers more freedom by granting them free access to GPU memory for CPU/GPU related tasks. AMD was the first company to deliver this, and soon all of their competitors will too. 

Smart Access Memory is AMD's brand name for Resizable BAR support, and while AMD was first, Intel was not far behind. It did not take long for Resizable BAR support to arrive on Z490, which allowed us to do our testing today with Intel's i9-10850K processor. 

Right now, all major motherboard manufacturers have updated their Z490 motherboards with Resizable BAR support. Furthermore, Resizable BAR will be supported on all of Intel's Z590 motherboards. Intel has embraced the PCIe spec's optional Resizable BAR feature, as they know how much it could impact the performance of future games. 

Our results from Assassin's Creed Valhalla and Forza Horizon 4 have already shown us that Resizable BAR support can deliver tremendous performance gains in existing games. Future titles have the potential to use Resizable BAR support more explicitly to deliver even larger performance benefits. AMD and Intel support this resizable BAR in their latest motherboard BIOS'. AMD supports it in their latest graphics cards, and Nvidia will be rolling out support for the feature in their future graphics cards drivers. Soon, Resizable BAR will be a feature that developers cannot ignore. 

It is worth noting that the Resizable BAR support has delivered us similar performance gains on our Ryzen 9 3950X and Intel i9-10850K, highlighting that the Resizable BAR support does not deliver any additional performance benefits when used in conjunction with PCIe 4.0. This is great news for Intel Z490 motherboard users with 10th Generation CPUs, as they will not need a PCIe 4.0 platform upgrade to access the full benefits of resizable BAR support. 

While large performance gains are possible through Resizable BAR support, this feature is not a magic bullet that will deliver you performance gains in all PC titles. Resizable BAR is designed to give your PC access to more resources, and from there it is up to your software to utilise those resources. 

Only time will tell how Resizable BAR support will change PC gaming. Having Intel and Nvidia quickly follow AMD's lead is a good sign of things to come, though it will likely take years for developers to utilise the feature to its fullest extent. 

You can join the discussion on Resizable BAR support on Intel processors on the OC3D Forums

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Most Recent Comments

30-01-2021, 18:04:21

NeverBackDown
Pretty impressive to say the least. Almost like DLSS magic where a click of a switch and boom instant fps increase, not to the same extent but still impressive. It'll be interesting to see how much impact alongside DLSS this would have. Would it be another similar magical boost? If so Nvidia will really be hammering AMD even more.Quote

30-01-2021, 22:15:27

FTLN
Bring on the RTX Bios's with this feature enabled, not sure why Nvidia is taking so long, it seems the driver is already prepped.....

https://i.imgur.com/xC8nCuW.pngQuote

30-01-2021, 22:47:55

WYP
Quote:
Originally Posted by FTLN View Post
Bring on the RTX Bios's with this feature enabled, not sure why Nvidia is taking so long, it seems the driver is already prepped.....

https://i.imgur.com/xC8nCuW.png
Driver enablement isn't supposed to be coming until the release of the RTX 3060. Nice to see that there is a way to confirm it is working on Nvidia hardware. With AMD you kinda need to trust that it's working...

Nvidia needs to do a lot of validation before it goes public. They need to make sure that enabling this does not add new bugs or degrade performance in some instances.Quote

31-01-2021, 12:12:21

looz
Yeah I heard that AMD disables Resizable BAR on driver level for many titles, since it can lead to issues.Quote

01-02-2021, 08:42:59

Peace
Quote:
Originally Posted by looz View Post
Yeah I heard that AMD disables Resizable BAR on driver level for many titles, since it can lead to issues.
Guess we'll have to see how it looks with Nvidia then, because if this doesn't create any negative issues, it's an absolute nobrainer.
Let's just hope that motherboard manufacturers don't lock this for the cheaper models...Quote
Reply
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