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Does AMD's RX 6600XT as Navi23 (Beige Goby) only come with 32 MB instead of 64 MB Infinity Cache?

AMD had recently released the first open source Linux graphics driver code for a new GPU called Beige Goby. Listed in it, Beige Goby is the latest Linux-specific codename used for new hardware enablements in their graphics drivers. We remember: After the Dimgrey Cavefish, the Sienna Cichlid, the Navy Flounder and others, the Beige Goby is now the latest naming achievement following the well-known color and fish theme.

Beige Goby here should stand for the new RX 6600 series and also be based on RDNA2, because most of the Beige Goby activation in the AMDGPU Linux driver follows the code paths of Dimgrey Cavefish and Sienna Cichlid, the two larger cards. The biggest part, because not everything follows the known paths here. I had a lengthy chat with Moore's Law is Dead last night and we went over the following pretty intensely now. In the end, we came to the conclusion that it could be good, but not necessarily must, because AMD also likes to build in the one or other smoke candle.

To that end, an AMD employee wrote:

Updated the L1 cache information and added the L2/L3 information. The changes were made for Vega10 and newer ASICs. There are no changes for the older ASICs before Vega10.". This update brings 699 insertions and 50 deletions to the kfd_crat.c file. The patches are not limited to newer GPUs and APUs. Cache information for various GPUs such as Vega 10 or Aldebaran (the upcoming Instinct MI200) has also been added.

But what is it about?

The file (viewable on Github) includes an update for Sienna Cichlid (nav 21), Navy Flounder (nav 22) and Dimgrey Cavefish (nav 23). Infinity Cache isn't mentioned directly, but the file lists Level 3 Cache, which is basically where AMD actually puts Infinity Cache in the driver. While Navi 21 has 128*1024 (128MB) Infinity Cache, the just released Navi 22 has 96MB. However, according to the file, it seems that Navi 23 only has 32 MB, which is only half of what you could have expected with 64 MB.

The file also contains information about the VanGogh and Aldebaran chips. While the latter wasn't expected to have Infinity Cache at all, since it's a future compute accelerator and not really a GPU, the lack of Infinity Cache on VanGogh might be a surprise. This upcoming APU will feature Zen2 Compute Core and integrated Navi graphics. This is actually the first AMD APU to offer RDNA-based graphics, but the purpose of this APU is not yet clear. Some rumors suggest it could be a dedicated APU for an unnamed handheld console, while others think it could simply launch as another mid-range APU. Here, time will have to tell what is actually true.

The discussions have just really picked up speed and so there is now also busy speculation about Navi 24. Should only 16 MB Infinity Cache be used here (together with a 64-bit memory interface and a maximum of 4 GB of memory), then you would more or less arrive in the lower entry level to office range. 

But how much Infinity Cache do you really need? AMD seems to be quite relaxed about this, as the following slide would like to prove, since they still consider 32 MB to be sufficient for Full HD. Sure, you can cut costs with a halving like that, but for the casual gamer who might want to give WQHD a go, this is probably rather bad news.

Sources: Github, Videocardz

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AMD hatte unlängst den ersten Open-Source-Linux-Grafiktreiber-Code für eine neue GPU mit dem Namen Beige Goby veröffentlicht. Darin aufgeführt, ist Beige Goby ist der neueste Linux-spezifische Codename, der für neue Hardware-Enablements in ihren Grafiktreibern verwendet wird. Wir erinnern uns: Nach dem Dimgrey Cavefish, dem Sienna Cichlid, der Navy Flounder und anderen ist die Beige Goby nun […]

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Igor Wallossek

Editor-in-chief and name-giver of igor'sLAB as the content successor of Tom's Hardware Germany, whose license was returned in June 2019 in order to better meet the qualitative demands of web content and challenges of new media such as YouTube with its own channel.

Computer nerd since 1983, audio freak since 1979 and pretty much open to anything with a plug or battery for over 50 years.

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