Resizable BAR on Intel® Arc™ Graphics

What’s that oddly-named feature called “Resizable BAR” all about? Why does it matter? Don’t fear the ReBAR because TAP and Ryan have all the details in their latest video.

In GPUs, ReBAR isn’t a metal stick for strengthening concrete – but it does strengthen your gaming experience. We’ve been transparent that Resizable BAR (Base Address Register) is required to get a good experience with Intel® Arc™ hardware and it all comes down to how the GPU reads memory. In TAP’s words:

Resizable BAR is a pretty weirdly-named PCI Express feature and what it does is it allows transactions that originate on the CPU (like reads and writes) that are targeting GPU memory to be bigger.

So game data like textures, shaders, and geometry are constantly being written to the GPU’s VRAM from the CPU’s RAM. Without ReBAR enabled those transactions are smaller in size and the memory controller gets bombarded with tons of small data transfers. As TAP explains it:

That happens on things like scene changes, or when you load a new level or there’s a new effect happening. That’s why when you look at frametime charts you’ll see “ReBAR off” will generally result in spikes that were already there getting bigger.

The solution? Turn ReBAR on! It’s a motherboard feature so you’ll have to check your computer’s BIOS settings to enable it; check out this Intel Quick Start Guide for a how-to. There you’ll notice the supported platforms include 10th Gen and newer Intel® Core™ processors and most AMD Ryzen™ 3000 and all Ryzen 5000 CPUs. We want to ensure you get the best experience on Arc graphics regardless of your CPU preference.

We’ve got more videos with Ryan & TAP’s banter and describing Intel Arc features on their way soon, all of which you’ll find right here at arc.intel.com. Thanks for watching and being a part of our journey!

Intel Arc Author - Zachary Hill

Zachary Hill

August 12, 2022

Notices and Disclaimers

Performance varies by use, configuration and other factors. Learn more at  www.Intel.com/PerformanceIndex.

 

No product or component can be absolutely secure.

 

Your costs and results may vary.

 

​Intel technologies may require enabled hardware, software or service activation.

 

All product plans and roadmaps are subject to change without notice.

 

© Intel Corporation. Intel, the Intel logo, and other Intel marks are trademarks of Intel Corporation or its subsidiaries. Other names and brands may be claimed as the property of others​.​

Featured Articles

Find out what you need to know to design, customize, and build your own rig.

Get the guide

Learn how to get your own stream started.

Learn more

Sacriel wants to volunteer to be a cyborg guinea pig. This was one of the more interesting revelations to come out of a recent chat with the Intel Squad.

Read more
Intel Logo
© Intel Corporation     |      Terms of Use     |      *Trademarks     |     Cookies     |     Privacy Policy     |     Supply Chain Transparency     |     Site Map