AMD is also preparing a faster RDNA 3 graphics card that will have full Navi 31 XTX GPU cores known as Radeon RX 7900 XTX.
AMD Expected to Release Radeon RX 7900 XTX “RDNA 3” Graphics Card with Navi 31 XTX GPU and 24GB GDDR6 Memory
Last week we reported that AMD will release the Radeon RX 7900 XT graphics card with 20GB of GDDR6 memory. The GPU will use an abbreviated Navi 31 XT die and will be highly competitive against NVIDIA’s GeForce RTX 4090 graphics card. We’ve also reported that a second graphics card is in the works, and while we can’t confirm the final nomenclature for it at this time, our friends at Benchlife seem to have figured out what to name it.
According to the latest report, the AMD Radeon RX 7900 XTX will feature the flagship Navi 31 XTX GPU and 24GB of GDDR6 memory. Both cards will use MCM RDNA 3 GPUs and will be at the top of the series. This means that AMD will still have room for higher-end SKUs like the RX 7950 XT and RX 7950 XTX later on. The Navi 31 GPU is said to have 3D V-Cache design for Infinity Cache in addition to the MCM design. There’s also another Navi 3X die, reportedly set to deliver even higher performance, although we’re unlikely to see it in the Radeon RX 7000 family.
AMD Navi 31 “Plum Bonito” GPU Configuration
The flagship RDNA 3 chip, the AMD Navi 31 GPU, will power next-generation enthusiast cards like the Radeon RX 7900 XTX/XT graphics card. We have heard that AMD will drop the CU (Computing Units) in their next generation RDNA 3 GPUs in favor of WGP (Workgroup Processors). Each WGP will host dual CUs (Computing Units), but each CU within RDNA 2 will have twice SIMD32 clusters instead of just 2. Rumors have it that AMD has the option to choose between Samsung and TSMC for the 6nm die.
- AMD Navi31: 12288 Cores, 384-bit Bus, 192 MB Infinite Cache, 308mm2 GPU Die @5nm
- AMD Navi 21: 5120 Cores, 384-bit Bus, 128MB Infinite Cache, 520mm2 GPU Die @7nm
According to the latest information, AMD Navi 31 GPU with RDNA 3 architecture is expected to offer a single GCD with 48 WGP, 12 SA and 6 SE. This will give a total of 12,288 SPs or stream processors. That’s a 2.4x increase in cores compared to the 5120 SPs found on the Navi 21 GPU. The GPU or Navi 31 GCD is said to measure 308mm2 and will come packaged on TSMC’s 5nm process node. The truncated variant will include 42 WGP or 10,752 cores and 5 MCDs for 80MB of Infinite Cache on a 320-bit bus interface.
The Navi 31 GPU will also carry 6 MCDs likely to carry 64-bit (32-bit x 2) memory controllers, which will have 16MB of Infinite Cache per die and provide a 384-bit bus interface to the chip. While this equates to 96MB of Infinite Cache, which is less than the 128MB found on current Navi 21 GPUs, the recently pointed out and 32MB Infinite Cache (16MB 0-high + 16MB 1-hi for a total of 192MB cache) ) capacities. This is a 50% increase over the current Navi 21 design and also makes the Navi 31 the first GPU to have both chiplet and 3D stacked designs. These chips, or MCDs, will be manufactured on TSMC’s 6nm process node and will measure 37.5mm.2 each one.
Now, this will result in a higher power draw and AMD seems to have so confirmed that their next-gen graphics card lineup will have higher power consumption, but it will still be a more efficient option than NVIDIA’s offering. AMD Radeon RX 6950 XT already has 335W TBP, ie >2x performance boost. The cards are expected to retain dual 8-pin plug sockets for power and feature an updated triple-fan cooling design that is slightly longer than currently in use.
AMD Radeon RX 7900 XT “Front” Features:
| graphics card | AMD Radeon RX 7900 XTX | AMD Radeon RX 7900 XT | AMD Radeon RX 6950 XT | AMD Radeon RX 6900 XT |
|---|---|---|---|---|
| GPU | Navi 31 XTX | Navi 31XT | Navi 21 KXTX | Navi 21 XTX |
| Compute Node | 5nm+6nm | 5nm+6nm | 7nm | 7nm |
| Mold size | 308mm2 (GCD only) 533 mm2 (with MCDs) |
308mm2 (GCD only) 533 mm2 (with MCDs) |
520mm2 | 520mm2 |
| transistors | TBD | TBD | 26.8 Billion | 26.8 Billion |
| GPU WGPs | 48 | 42 | 40 | 40 |
| Stream Processors | 12288 | 10752 | 5120 | 5120 |
| TMUs/ROPs | TBD | TBD | 320 / 128 | 320 / 128 |
| Game Clock | TBD | TBD | 2100MHz | 2015MHz |
| Upgrade Clock | >3GHz | >3GHz | 2310MHz | 2250MHz |
| FP32 TFLOPs | >75 TFLOPs | >65 TFLOPS | 23.65 TFLOPs | 23.04 TFLOPs |
| memory size | 24GB GDDR6 | 20GB GDDR6 | 16GB GDDR6 | 16GB GDDR6 |
| Memory Bus | 384 bits | 320 bits | 256-bit | 256-bit |
| memory clock | ~20Gbps | ~20Gbps | 18Gbps | 16Gbps |
| Band width | ~960GB/s | ~800GB/s | 576GB/s | 512GB/s |
| Effective Bandwidth | TBD | TBD | 1728.2 GB/s | 1664.2GB/s |
| TBP | ~400W | ~350W | 335W | 300W |
| PCIe Interface | PCIe 5.0×16 | PCIe 5.0×16 | PCIe 4.0 x16 | PCIe 4.0 x16 |
| Price | TBD | TBD | $1099 US | $999 US |
AMD will introduce the RDNA 3 GPU architecture and Radeon RX 7000 graphics cards on November 3. There is a full Live Stream scheduled, where you can read more details here.
News Source: Benchlife