AMD will announce its RDNA 3 flagship on the 3rd of November to tackle the newly launched GeForce RTX 4090. The Radeon RX 7900 XTX will feature the full-fledged Navi 31 die, six memory dies (MCD), and a 384-bit bus. From what we’ve heard in the past months, each of the MCDs will consist of a 64-bit bus and 32MB of L3 cache (16MB planar + 16MB 3D V-Cache). In addition, the XTX has been paired with 24GB of GDDR6 memory running at 20Gbps, just slightly slower than the (24GB GDDR6X) 22.5Gbps found on the RTX 4090.
Over the past weeks, we’ve discussed the Navi 31 graphics core in excruciating detail. It’ll feature 12,288 shaders across 48 WPGs and 6 Shader Arrays. The finer-grained specs are as follows:
| GPU Name | RX 7700 XT (Navi 33) | RX 7800 XT (Navi 32) | RX 7900 XT (Navi 31) | RX 7950 XT (Navi 30?) |
|---|---|---|---|---|
| Process Node | 6nm | 5nm + 6nm | 5nm + 6nm | 5nm + 6nm |
| Die Config | 6nm x1 | 5nm x1, 6nm x4 | 5nm x1, 6nm x5 | 5nm x1, 6nm x6 |
| Shader Engines | 2 | 4 | 6 | 6 |
| WGPs | 16 | 32 | 48 | 48 |
| CUs | 32 | 64 | 96 | 96 |
| Cores | 4,096 | 8,192 | 10,752? | 12,288 |
| Memory Bus | 128-bit | 256-bit | 320-bit? | 384-bit? |
| Memory Type | GDDR6 | GDDR6 | GDDR6 | GDDR6 |
| Memory Capacity | 8GB | 16GB | 20GB? | 24GB? |
| Infinity Cache | 64MB | 128MB | 192MB | 192MB? |
| TGP | 200W | 250W? | 300? | 350W? |
| Launch | Q4 2022 | Q1 2023 | Q4 2022 | 2023 |
The RX 7900 XT will come with a cut-down GPU and bus. The Graphics Die packs 10,752 cores alongside a 320-bit bus paired with 20GB of GDDR6 memory clocked at 20Gbps. The memory configuration indicates that there will be just five instead of six memory complex dies. The cache will be “castrated” as well, down to 160MB across five MCDs (each 16MB 1Hi+ 16MB 2Hi). (homefortheharvest.com)
Both the RX 7900s will rock a Type-C adapter, two Display Ports, and a single HDMI port.
