NVIDIA has finally officially announced support for the Resizable BAR (Base Address Registers) technology in its GeForce RTX 30-series graphics cards. This feature should provide some performance boost in games when running video cards on systems with compatible motherboards and processors.
Resizable BAR technology has been part of the PCI Express interface specifications since version 2.0, but only last fall AMD drew public attention to it, implementing its support (under the name Smart Access Memory) in its Radeon RX 6000 series video cards. With the help of Resizable BAR, you can provide the central processor with access to the entire array of video card RAM, while Windows PCs without this function can only access a maximum of 256 MB of video memory at a time. This removes I / O bottlenecks and AMD claims it can deliver up to 10-15% performance gains.
NVIDIA has not made any statements regarding the potential gain from the Resizable BAR. The company noted that it is now working with Intel and AMD, as well as key motherboard manufacturers, to ensure that the latest technology is available “on many motherboards” later this year.
First of all, Resizable BAR will appear in laptops with GeForce RTX 30 series graphics cards, which will begin to go on sale by the end of January. Moreover, the technology will be supported when these video cards work with both AMD processors (most likely Ryzen 5000) and Intel Tiger Lake-H.
Resizable BAR technology will come to NVIDIA desktop video cards a little later – by the end of February, along with the release of the GeForce RTX 3060. The technology will also be supported by all other GeForce RTX 30 series graphics accelerators – the corresponding VBIOS updates are already being developed and will be released in March.
However, with which processors it will be possible to use Resizable BAR in NVIDIA video cards, there is no exact information yet. Intel’s 11th generation Core H- and S-series processors (Tiger Lake and Rocket Lake) definitely support this technology, as well as “some 10th generation systems“(Comet Lake-S with Intel Z490 boards). From AMD’s side for sure support Resizable BAR when working with Ampere will receive Ryzen 5000, but there is no certainty about older chips.
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