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AMD RDNA 3 Navi 31 MCM to feature 256-bit GDDR6 memory, Navi 33 expected to outperform RX 6900 XT at ~US$450; Nvidia RTX 4090 AD102 to use 384-bit GDDR6X

The Navi 33-based RX 7700 XT could offer more performance than the current RX 6900 XT. (Image Source: AMD)
The Navi 33-based RX 7700 XT could offer more performance than the current RX 6900 XT. (Image Source: AMD)
The upcoming AMD RDNA 3 Navi 31-based RX 7900 XT will be based on a 5 nm + 6 nm MCM and could use a 256-bit memory bus but stick to GDDR5 VRAM. Navi 33 (RX 7700 XT) will be a 6 nm monolithic die with 128-bit GDDR6 VRAM and offer more performance than the current RX 6900 XT. The Nvidia Lovelace AD102 RTX 4090 will continue to use 384-bit GDDR6X memory and have GPU clocks greater than 2.2 GHz.

It is now becoming increasingly clear that Navi 31 will indeed use a multi-chip module (MCM) design while parts from Navi 33 and below will continue to be monolithic. We have also seen some information about Nvidia's upcoming Lovelace AD102 trickle down of late. Now, we are getting to know what the memory configurations of these cards would be like. 

This information comes via known leaker @greymon55 on Twitter. According to @greymon55, the Navi 31-based RX 7900 XT (?) will use a 5 nm + 6 nm MCM layout with 256-bit GDDR6 memory while RX 7800 XT (?) Navi 32 will also feature the same MCM process but with 192-bit GDDR6 VRAM. Navi 33 (RX 7700 XT ?) will be a 6 nm part with 128-bit GDDR6. AMD could once again be leveraging Infinity Cache to offset any perceived performance loss by not using a higher, more power-hungry memory interface.

Navi 33 is slated to offer more performance than the current RX 6900 XT, possibly in the alleged US$450 price bracket, given the expected improvements to core clocks and shift to a 6 nm process. If true, it is indeed a feat if Navi 31 is able to offer RTX 3090/RX 6900 XT-level gains with a 128-bit bus.

On the Nvidia Lovelace front, @greymon55 indicates GPUs from AD102 to possibly AD106. AD102 will be a 5 nm part with a 384-bit GDDR6X video memory. We have previously known that Nvidia could be targeting a greater than 2.2 GHz clock with the RTX 4090 (?). Given that Nvidia cards can actually achieve much higher boosts than advertised, we should be seeing some excellent clock speeds with the Lovelace cards. We still do not know what the actual memory capacity would be on the flagship RTX 4090, but a 384-bit bus would suggest at least 24 GB GDDR6X VRAM.

With Intel all set to join the fray next year with Xe-HPG DG2 Alchemist, the GPU market will be an interesting thing to watch in 2022.

Buy the EVGA GeForce RTX 3080 Ti FTW3 on Amazon

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1595 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 09 > AMD RDNA 3 Navi 31 MCM to feature 256-bit GDDR6 memory, Navi 33 expected to outperform RX 6900 XT at ~US$450; Nvidia RTX 4090 AD102 to use 384-bit GDDR6X
Vaidyanathan Subramaniam, 2021-09-20 (Update: 2021-09-20)