AMD might be equipping faster GDDR6 memory chips on its upcoming high-end Radeon RX 7900 series graphics cards based on Navi 31 "RDNA 3" GPUs.
AMD's High-End RDNA 3 "Navi 31" Powered Radeon RX 7900 Graphics Cards Allegedly Feature 20 Gbps Memory
The latest rumor comes from Greymon55 and states that the red team's fastest RDNA 3 GPUs based on the Navi 31 SKU will utilize faster GDDR6 memory dies. AMD's RDNA 2-powered Navi GPUs come with up to 18 Gbps memory speeds. The 18 Gbps memory was added to the recent RDNA 2 refresh while the initial lineup made use of 16 Gbps dies.
https://twitter.com/greymon55/status/1553300314987540480
It is stated that the Radeon RX 7900 series which will cover the high-end segment with their powerful MCM-based Navi 31 GPU design, will offer up to 20 Gbps memory speeds. That's an increase of 11% compared to the existing fastest memory solution for the AMD Radeon RX 6000 cards.
Considering that the AMD Radeon RX 7900 series flagship comes with a 384-bit bus interface, we will be getting a 960 GB/s bandwidth solution plus there's also Infinity Cache's bandwidth which is expected to be increased to 384 MB (192 MB standard + 192 MB 3D V-Cache in six MCDs). Recent speculation has shown that with the new MCD Infinity Cache structure, the Radeon RX 7900 series can offer up to a theoretical 7 TB/s bandwidth which would be a massive increase versus the 1.79 TB/s bandwidth currently available on the RX 6950 XT graphics card.
https://twitter.com/greymon55/status/1553311304625971200
https://twitter.com/greymon55/status/1553310481175089152
But that's not all, the leaker also says that an RDNA 3 refresh might feature the high-end 24 Gbps memory dies. This would yield the same GDDR6 bandwidth as NVIDIA's flagship GeForce RTX 3090 Ti graphics card. Even the RTX 4090 Ti is expected to utilize 24 Gbps memory dies though we will see if that plan changes in the future. As for when the refresh is planned, it is expected around the end of 2023 or early 2024 so we got more than a year to go and the launch of AMD RDNA 3's initial family to be witnessed before we talk about a refresh. The memory would be equipped with all of the refreshed models.
AMD RDNA 3 Navi 3X GPU Configurations (Preliminary)
| GPU Name | Navi 21 | Navi 33 | Navi 32 | Navi 31 | Navi 3X |
|---|---|---|---|---|---|
| Codename | Sienna Cichlid | Hotpink Bonefish | Wheat Nas | Plum Bonito | TBD |
| GPU Process | 7nm | 6nm | 5nm/6nm | 5nm/6nm | 5nm/6nm |
| GPU Package | Monolithic | Monolithic | MCM (1 GCD + 4 MCD) | MCM (1 GCD + 6 MCD) | MCM (TBD) |
| GPU Die Size | 520mm2 | 203mm2 (Only GCD) | 200mm2 (Only GCD) 425mm2 (with MCDs) | 300mm2 (Only GCD) 522mm2 (with MCDs) | TBD |
| Shader Engines | 4 | 2 | 3 | 6 | 8 |
| GPU WGPs | 40 | 16 | 30 | 48 | 64 |
| SPs Per WGP | 128 | 128 | 128 | 128 | 128 |
| Compute Units (Per Die) | 80 | 32 | 60 | 96 | 128 (per GPU) 256 (Total) |
| SPs (Per Die) | 5120 | 2048 | 3840 | 6144 | 4096 |
| ALUs (Per Die) | 5120 | 4096 | 7680 | 12288 | 16384 |
| Memory Bus | 256-bit | 128-bit | 256-bit | 384-bit | 384-bit x2? |
| Memory Type | GDDR6 | GDDR6 | GDDR6 | GDDR6 | GDDR6 |
| Memory Capacity | Up To 16 GB | Up To 8 GB | Up To 16 GB | Up To 24 GB | Up To 32 GB |
| Memory Speed | 16-18 Gbps | TBD | TBD | 20 Gbps | TBD |
| Memory Bandwidth | 512-576 GB/s | TBD | TBD | 960 GB/s | TBD |
| Infinity Cache | 128 MB | 32 MB | 64 MB | 96/192 MB | TBD |
| Flagship SKU | Radeon RX 6900 XTX | Radeon RX 7600 XT? Radeon RX 7700M? | Radeon RX 7800 XT? Radeon RX 7900M? | Radeon RX 7900 XTX | Radeon Pro |
| TBP (Max) | 330W | ~150W | ~250W | 335W | TBD |
| Launch | Q4 2020 | Q4 2022? | Q4 2022? | Q4 2022? | 2023? |
News Source: Videocardz
About the author: A Software Engineer by training and a PC enthusiast by passion, Hassan Mujtaba serves as Wccftech's Senior Editor for hardware section. With years of experience in the industry, he specializes in deep-dive technical analysis of next-generation CPU and GPU architectures, motherboards, and cooling solutions. His work involves not only breaking news on upcoming technologies but also extensive hands-on reviews and benchmarking.
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