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About a month ago, NVIDIA announced that it would be bringing Resizable BAR support to its RTX 30 Series laptop parts as well as RTX 30 Series desktops and with their GeForce Game Ready Driver 461.72, they have it. did. But for now, it’s a bit limited with only supported mobile SKUs and a single desktop piece, the RTX 3060.
In short, Resizable BAR removes the strict restriction on the amount of data that can flow between the processor and GPU memory and can sometimes allow substantial increases in performance. Resizable BAR gained popularity and recognition when AMD implemented Smart Access memory when you paired a Ryzen 5000 series processor and 500 series chipset with an RX 6000 series GPU. The biggest differentiator here is AMD’s implementation. and NVIDIA is that NVIDIA’s support for ReBAR (Resizable BAR) is that it is supported on many other platforms.
In fact, NVIDIA has extended ReBAR support even to PCIe Gen 3.0 platforms by supporting 10th Generation Intel Core Series processors with the 400 series chipsets already available. Interestingly, AMD processor support only includes the Zen 3 Ryzen 5000 series, indicating that there is a lot more to just flipping a switch, but they show support even for motherboards. of the 400 series chipset as long as the BIOS supports it.
Test setup
Test system
| Components | X570 |
|---|---|
| CPU | Ryzen 9 5900X (in stock) |
| Memory | 32GB Hyper X Predator DDR4 3600 Memory |
| Motherboard | ASUS TUF Gaming X570 Plus-WiFi |
| Storage room | TeamGroup Cardea 1TB NVMe PCIe 4.0 |
| PSU | Cooler Master V1200 Platinum |
| Windows version | Latest version of Windows at time of testing |
| Hardware-accelerated GPU planning | Enabled if supported by GPU and driver. |
One of the interesting moves with NVIDIA’s addition to the Resizable-BAR support is that they are selective on supported games and this is done through the drivers. Why are you asking? Well, for example, in testing done by Hardware Unboxed, we saw where AMD’s implementation of Smart Access memory can sometimes lead to no performance benefit or even degradation in performance. Currently, the list is rather limited but is expected to grow rapidly as we see support expanding to other cards. The supported games are;
- Assassin’s Creed Valhalla
- Battlefield v
- Borderlands 3
- Forza Horizon 4
- Gears 5
- Metro Exodus
- Red Dead Redemption 2
- Watch Dogs: Legion
RTX 3060 12 GB Resizable BAR 1440p Results
Conclusion
NVIDIA limiting game support at launch might have seemed odd, but it looks like they are looking to roll out support for games that only get this feature. In our results, we saw a performance increase of 4-11%, which is often not even achieved by heavy overclocking. This is a welcome result and the fact that it is updated through the drivers and the games are whitelisted means you won’t have to worry about whether a game is losing performance due to enabling the resizable bar function in BIOS.
Support for Resizable BAR on much higher-end cards will obviously be attractive, but at this more affordable price segment (although it is for now), this is where things are really going to shake up technology like this one. The combinations of resizable BAR, Mesh Shaders, VRS and even DLSS can really transform the expectations of the midrange offerings. When the dust settles due to uptime issues, I have a feeling things like Smart Access memory and the resizable BAR will need to be shown in performance comparisons as they are often too big to ignore for those who do. are shopping.
Exploring performance in the graphics card space is getting exponentially more complicated these days with all the cool new features provided to all DX12 Ultimate compatible GPUs, it gets pretty exciting, provided we can buy them.
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