AMD may be working on monstrous RDNA 3 GPU with two dies

According to a new leak, AMD may have a secret asset up its sleeve in the form of its most powerful GPU yet. It looks like the company is working on a RDNA 3 graphics card that we haven’t heard of before.

The rumored GPU, when and if it is released, would come with dual graphics cards and an unprecedented number of GPU cores.

2023
Specifications to be determined. https://t.co/lvt9SxBPLG

— Greymon55 (@greymon55) June 21, 2022

This tantalizing news comes from Greymon55 on Twitter, a well-known leaker with an established track record. In one of the tweets, Greymon55 refers to the mysterious graphics card as “7990XT”, implying that it would be the crown jewel of AMD’s RDNA 3 series.

In a follow-up tweet, Greymon55 reveals that it is a brand new GPU and does not fall under the Navi 31, Navi 32 or Navi 33. It should be more powerful than Navi 31, which, as far as we know, is the flagship GPU for that generation of AMD cards.

The poster first unveiled the alleged graphics cards a few days ago and talked about it coming with 16,384 stream processors (SPs) and eight shader engines (SEs). At the time, Greymon55 wasn’t sure if the GPU even existed and if it was a gaming GPU or something made for professionals. However, their new tweet seems to confirm that the graphics card does exist, and is expected to launch in 2023.

Since this GPU is rumored to be even better than the Navi 31, it leaves room for some interesting tweaks that could potentially be made to the architecture of the graphics card. The first rumors about the Navi 31 GPU suggested that it would have dual graphics core dies (GCDs). Some of these leaks even extended to the Navi 32.

Over time, however, this has been rectified and it is now expected that both the Navi 31 and Navi 32 will have a single GCD with several multi-cache dies (MCDs).

AMD Radeon RX 6000 graphics card.
AMD

If the AMD Radeon RX 7990XT (or any other variation of the name) comes along, it could potentially revive the concept of using dual GCDs. Achieving 16,384 cores with dual Navi 31 chips shouldn’t be hard, but as noted by Wccftech, the GPU would likely ship with a new chip, opening up the potential for even better specs. While Greymon initially teased the aforementioned core count, the leaker now says the final specs of the card are “yet to be determined.”

Assuming the core count stays the same and AMD uses a dual GCD design, we may be able to see the GPU arrive with up to 32GB of memory over a dual 384-bit memory bus. This can be associated with a total of 256 compute units (CUs).

Such a GPU would, of course, be an absolute gaming beast, and if it came out as a gaming product, it would top any list of the best graphics cards† However, it could also be overkill for gaming and could be part of a future Radeon Pro graphics card lineup. These cards are preferred by content creators and other users who need the absolute highest levels of performance a GPU can possibly provide. On the other hand, Greymon’s proposed “RX 7990 XT” name seems to contradict that theory.

As with any rumor since this one, it’s important to take this leak with a healthy dose of skepticism. Even assuming AMD is indeed working on an RX 7990XT, there’s no telling when or if it will hit the market. Until that happens, we’ll have the rest of the RDNA 3 series to look forward to later this year.

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