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AMD Ryzen 6000 Rembrandt Yellow Carp Navi 2x RDNA 2 iGPU to feature DCN 3.1 with added low-power states and 2 MB L2 cache per shader array but no Infinity Cache

AMD Ryzen Rembrandt APUs will also forego the Infinity Cache similar to Van Gogh. (Image Source: AMD)
AMD Ryzen Rembrandt APUs will also forego the Infinity Cache similar to Van Gogh. (Image Source: AMD)
AMD's upcoming Rembrandt Yellow Carp APUs for laptops will feature Navi 2x RDNA 2 iGPUs without Infinity Cache similar to what we've known for Van Gogh. Rembrandt will bring LPDDR5/DDR5, PCIe Gen 4, USB4 support on a 6 nm Zen 3+ architecture. It's RDNA 2 iGPU will use an upgraded DCN 3.1 engine with added low-power clock states and 2 MB L2 cache per shader array with six CUs.

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AMD is soon expected to introduce two new APUs for laptops — Van Gogh and Rembrandt. While Van Gogh will be a low-power APU around the 9 W TDP mark, Rembrandt-H will be the successor to the current Cezanne APUs and will be a 6 nm Zen 3+ part in the 45 W segment. Both Van Gogh and Rembrandt are expected to sport Navi 2x RDNA 2 iGPUs.

It is well-known that Navi GPUs use Infinity Cache, which can be thought of at a high level as an L3 cache for GPUs, that enables them to get away with using slower GDDR6 memory and smaller memory buses. Recent versions of the AMDKFD Linux kernel driver revealed that Van Gogh APUs will not feature Infinity Cache. Now, we are getting to know that even Rembrandt APUs will not feature it. 

Rembrandt, also known as Yellow Carp, will be the first AMD APU to support both LPDDR5 and DDR5 memory. A total of 89 patches to the Linux kernel mode driver were posted revealing new details about AMD's upcoming APU, which were discussed on Coelacanth Dream

According to these commits, the RDNA 2 iGPU in Rembrandt isn't too different from that of Van Gogh's, but there are some changes to the display engine. Rembrandt's RDNA 2 iGPU will use Display Core Next (DCN) 3.1 unlike Van Gogh, which uses DCN 3.0. DCN 3.1 adds a new clock state called ZState or z9/10. Apparently, this allows added flexibility in switching clocks for more power-savings. Rembrandt's maximum screen output is capped at four similar to what we've seen with Raven Ridge, Picasso, and Renoir.

Additionally, a new kernel fusion driver (KFD) patch further indicates that the RDNA 2 iGPU in Rembrandt will not have an L3 or Infinity Cache similar to Van Gogh, though the size of the caches themselves are different. Also, Van Gogh is said to have eight compute units (CUs) per shader array with a 1 MB L2 cache while Rembrandt will have six CUs per shader array with 2 MB L2 cache, with the added cache possibly translating into improved gaming performance. It must be noted here that we still do not know the total number of CUs on the GPU, but rumors indicate up to 12 CUs for Rembrandt.

Rembrandt will also introduce support for PCIe Gen 4 for both H-series and U-sereis so a change to the FP7 socket is inevitable considering that we will be seeing memory subsystem changes as well. Also on the anvil is USB4 support. AMD is expected to launch Van Gogh sometime later this year followed by Rembrandt in 2022.

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AMD silicon roadmap for notebooks. (Source: @Broly_X1 on Twitter)
AMD silicon roadmap for notebooks. (Source: @Broly_X1 on Twitter)
AMD RDNA 2 cache sizes. (Source: Coelacanth Dream)
AMD RDNA 2 cache sizes. (Source: Coelacanth Dream)
AMD RDNA 2 cache config in Van Gogh and Rembrandt Yellow Carp. (Source: Coelacanth Dream)
AMD RDNA 2 cache config in Van Gogh and Rembrandt Yellow Carp. (Source: Coelacanth Dream)
 

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1392 articles published on Notebookcheck since 2012
Though a cell and molecular biologist by training, I have been drawn towards computers from a very young age ever since I got my first PC in 1998. My passion for technology grew quite exponentially with the times, and it has been an incredible experience from being a much solicited source for tech advice and troubleshooting among family and friends to joining Notebookcheck in 2017 as a professional tech journalist. Now, I am a Lead Editor at Notebookcheck covering news and reviews encompassing a wide gamut of the technology landscape for Indian and global audiences. When I am not hunting for the next big story or taking complex measurements for reviews, you can find me unwinding to a nice read, listening to some soulful music, or trying out a new game.
contact me via: @Geeky_Vaidy
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2021 06 > AMD Ryzen 6000 Rembrandt Yellow Carp Navi 2x RDNA 2 iGPU to feature DCN 3.1 with added low-power states and 2 MB L2 cache per shader array but no Infinity Cache
Vaidyanathan Subramaniam, 2021-06- 4 (Update: 2021-06- 4)