AMD Radeon RX 6600, confirmed the amount of Infinity Cache?

AMD Radeon RX 6600, confirmed the amount of Infinity Cache?

AMD Radeon RX 6600

We told you about the rumored AMD Radeon RX 6600 graphics card about a month ago, when the GPU, along with the RX 6700, appeared in the latest version of GPU-Z, a popular monitoring tool developed by TechPowerUp. However, it was certainly not the first time that the name appeared on the net, since some recordings had been identified at the ECC body by some big producers such as Gigabyte, PowerColor and ASRock.

Up to now, the precise technical specifications are still shrouded in mystery, but recently, as reported by the colleagues at VideoCardz, a new patch for AMKFD, HSA driver for the Linux kernel, has been published, containing various information relating to the GPUs arriving in the course of the next weeks. The file, in fact, includes some updates for Sienna Cichlid (Navi 21), Navy Flounder (Navi 22) and Dimgrey CaveFish (Navi 23). In particular, the amount of L3 cache is listed, equivalent to the size of the known Infinity Cache. Navi 21 presents 128 × 1084 (128MB) of Infinity Cache, the recent Navi 22 reaches up to 96MB, while, according to the file, Navi 23 will have 32MB.

Freedesktop In addition to this, we learned that Van Gogh, APU that will be composed of CPU cores based on Zen 2 architecture accompanied by an integrated Navi GPU, the first chip of this type to offer an RDNA-based graphics component, will not be equipped with Infinity Cache. At the moment, however, it has not yet been made known what products this APU was designed for, although some rumors speak of a handheld console as yet unnamed, while others assert that Van Gogh is a simple mid-range APU.

Freedesktop We remember that we do not yet know what the official name of the graphics cards equipped with the Navi 21 GPU will be. Some think it will be the heart of the Radeon RX 6600, while others even point to the Radeon RX 6500. For the moment , of course, we just have to wait for more updates directly from AMD.

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AMD's Upcoming Radeon RX 6600 RDNA 2 GPU To Feature 32MB Of Infinity Cache

A recent patch for Linux issued by AMD essentially confirms that the rumored Radeon RX 6600 will have a third of the amount of Infinity Cache as the already-launched Radeon RX 6700 XT. How this ends up affecting real-world performance obviously remains to be seen, but it is an interesting revelation all the same.What exactly is Infinity Cache, and should you care? This is a part of AMD's second-generation Radeon DNA (RDNA 2) architecture. AMD introduced a new cache hierarchy with RDNA 2, injecting its latest GPUs with a pool of fast cache. Here's a look...We got our first look at this with the Radeon RX 6800 series. Both the Radeon RX 6800 XT and Radeon RX 6800, powered by AMD's Navi 21 GPU (Navi 21 XT and Navi 21 XL, respectively), feature 128MB of Infinity Cache and a 256-bit memory bus. Coupled with 16Gbps GDDR6 memory chips, AMD says the implementation of Infinity Cache on those cards increases their native 512GB/s of native bandwidth all the way to 1,664GB/s (effective).The same goes for AMD's flagship Radeon RX 6900 XT, based on AMD's Navi 21 XTX GPU—it too sports 128MB of Infinity Cache, 16Gbps GDDR6 memory chips, and a 256-bit memory bus. In short, Infinity Cache allows AMD to offer higher memory bandwidth on its graphics cards without resorting to a more expensive 512-bit memory bus, or pricier GDDR6X chips.Linux Patch Reveals AMD's Radeon RX 6600 Will Ship With 32MB Of Infinity CacheOur primer on Infinity Cache out of the way, let's talk about the Radeon RX 6600. In a recently issued patch for AMKFD, the Linux kernel HSA (Heterogeneous System Architecture) driver for AMD's processors with integrated graphics, AMD revealed some interesting tidbits about the cache arrangement for various GPUs.

'The L1 cache information has been updated and the L2/L3 information has been added. The changes have been made for Vega10 and newer ASICs. There are no changes for the older ASICs before Vega10,' an AMD employee wrote.

Here's a look at the relevant patch notes...

To understand what we're looking at, let's break down the codenames at the top...

  • Sienna Cichlid: Navi 21 (Radeon RX 6900/6800 series)
  • Navy Flounder: Navi 22 (Radeon RX 6700 series)
  • Dimgrey Cavefish: Navi 23 (Radeon RX 6600 series?)
  • The patch notes correctly show 128MB of Infinity Cache tied to Navi 21 (Radeon RX 6900 and 6800 series) and 96MB of Infinity Cache tied with Navi 22 (Radeon RX 6700 series). Then on the far right, we see Navi 23 sporting 32MB of Infinity Cache. This is believed to be what the Radeon RX 6600 will be powered by, whenever it launches. Note that these entries are labeled as 'L3 cache,' and not specifically 'Infinity Cache' (though that's basically what it is).

    So there you have it—that is about as close to official confirmation as there can be, short of an actual product launch or overt announcement. In this case, the revelation comes by way of Mike Li, who according to his LinkedIn profile, is a senior software development engineer at AMD.