So far, AMD has only unveiled two graphics cards based on RDNA 3 that are aimed at demanding enthusiasts with deeper pockets. Although it is obvious that AMD plans to add more models to its Radeon RX 7000 series, it remains unclear exactly which ones and when they will appear. However, a recently discovered AMD ROCm 5.6 pull request uncovered by a Reddit user may provide some insight into the company’s plans.
It looks like AMD is preparing a new series of products called Radeon RX 7000, which includes the Radeon RX 7950 XTX, 7950 XT, 7800 XT, 7700 XT, 7600 XT and 7500 XT for desktop computers, and the Radeon RX 7600M XT, 7600M, 7700S and 7600S for laptops. Looking closely at the list, several things stand out:
- AMD Radeon™
- RX 7950 XTX | RDNA3 | gfx1100
- AMD Radeon™ RX 7950 XT | RDNA3 | gfx1100
- AMD Radeon™ RX 7900 XTX | RDNA3 | gfx1100
- AMD Radeon™ RX 7900 XT | RDNA3 | gfx1100
- AMD Radeon™ RX 7800 XT | RDNA3 | gfx1101
- AMD Radeon™ RX 7700 XT | RDNA3 | gfx1102
- AMD Radeon™ RX 7600 XT | RDNA3 | gfx1102
- AMD Radeon™ RX 7500 XT | RDNA3 | gfx1102
- AMD Radeon™ RX 7600M XT | RDNA3 | gfx1102
- AMD Radeon™ RX 7600M | RDNA3 | gfx1102
- AMD Radeon™ RX 7700S | RDNA3 | gfx1102
- AMD Radeon™ RX 7600S | RDNA3 | gfx1102
First, they include the Radeon RX 7950 XTX and Radeon RX 7950 XT, which are based on the Navi 31 (gfx1100) GPU and have not been mentioned so far. Nevertheless, the company already offers the Radeon RX 7900 XTX and Radeon RX 7900 XT, which are among the best graphics cards currently available. Therefore, it is unclear if the 7950 models will be refreshed versions that won’t be released for a few quarters, or if they will serve as placeholders for potential products if AMD feels they are needed. Aside from higher clock speeds, it’s unclear how AMD will justify the model number increase. However, doubling the stacked cache on the MCD or a more refined node would be a possible option.
A Radeon RX 7800 XT based on gfx1101 is included in the pull request. Although it is likely to be a Navi 32 GPU, it could be something else. It is worth noting that there is no sign of a conventional Radeon RX 7800 so far, and the gfx1101 GPU is the only one of its kind. This fact is a bit strange. The list implies that Navi 33 (or gfx1102) will be included in all versions from the performance-oriented Radeon RX 7700 XT down to the entry-level Radeon RX 7500 XT. However, there is no indication of non-XT versions.
In comparison, AMD has used Navi 22 exclusively for its Radeon RX 6700 series desktop graphics cards and Radeon RX 6700M and Radeon RX 6800M notebook GPUs. Apparently, AMD plans to use Navi 32 only in certain products, which means that there are other plans that are not yet known. In the meantime, Navi 23 has been used in the RX 6600 series (RX 6600, RX 6600 XT and RX 6650 XT) as well as in mobile variants. Navi 33 is expected to be a monolithic chip and will likely be used in entry-level models (RX 7500) as well as mainstream models (RX 7600/7700).
There is no word yet from AMD regarding the inclusion of their graphics cards in the ROCm 5.6 list. It is important to note that the list only shows AMD’s intention to release certain products, but does not guarantee that they will be immediately available. Also, the exact specifications of the graphics cards remain a secret for now. However, it is likely that graphics cards further down the list (especially in the desktop range) will feature a reduced number of GPU shaders. However, the clock speeds, memory bus widths and cache sizes are still unknown.
The memory bus in particular will be a contentious issue. AMD has stressed that Nvidia is offering “limited” GPUs with less than 16GB of memory, while AMD is offering 16GB on the RX 6800 up to the RX 6950 XT and 24GB/20GB of VRAM on the newer RX 7900 XTX/XT. The 7900 series parts have 320-bit and 384-bit interfaces provided by five or six MCDs. More information about the chiplet architecture can be found in our RDNA 3 deep dive. If Navi 32 has a 256-bit interface, the upper limit for consumer cards will probably be 16 GB. However, it is more likely that we will see Navi 33 with 192-bit or even 128-bit interfaces, which means they will support a maximum of 12 GB and 8 GB, respectively, unless AMD decides to use VRAM on both sides of the board.
In any case, it is advisable to wait for the next few months. There are still plenty of RX 6000-series cards in stock, which is probably why AMD hasn’t launched any lower-end RX 7000-series GPUs yet. If the RX 7800 XT and RX 7700 XT hit the market soon, it could mean that AMD has finally managed to clear out most of its RDNA 2 stock.
Source: TomsHardware
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