6nm RDNA GPU, 8GB GDDR6, equal to RX 6900 XT in rasterization and faster in ray tracing, around 200W of power and higher efficiency than NVIDIA Lovelace

The latest details on AMD’s mid-range Navi 33 GPU based on the RDNA 3 architecture This will power the Radeon RX 7700 XT graphics card Moore’s Law is dead in his latest video.

AMD Radeon RX 7700 XT graphics card uses Navi 33 RDNA 3 GPU with same 6900 XT dithering, faster ray tracing and higher efficiency than NVIDIA Lovelace

The AMD RDNA 3 line of GPUs will consist of both monolithic and multi-chiplet solutions. The Navi 33 GPU is considered a mid-range chip and is an optimization of the Navi 21 GPU on the newer RDNA 3 architecture. It’s based on a 6nm monolithic design and should measure between 360 and 460mm2. That’s an 11 to 30 percent reduction in die area compared to the Navi 21 GPU, which powers the high-end Radeon RX 6000 series and has a die size of 520mm2. Key features of the Navi 33 GPU will be:

Post-SP5 socket, AMD’s EPYC Genoa CPU is mapped with 12 next-gen Zen 4 CCDs on 5nm nodes with up to 96 cores

  • TSMC 6nm Process Node (Monolithic GPU Design)
  • RDNA 3 graphics core (increased clock speeds/efficiency)
  • 8GB of GDDR6 memory optimized over a 128-bit bus
  • Faster GDDR6 memory speeds
  • Rasterization performance equal to or greater than RX 6900 XT
  • Ray tracing performance greater than RX 6900 XT

AMD RDNA 3 Navi 33 GPUs for the Radeon RX 7700 series

The AMD Navi 33 GPU will start the monolithic segment within the RDNA 3 family. The GPU will have a single chip. The die is very similar to the flagship Navi 21 GPU and is expected to use a 6nm process node for manufacturing.

AMD Navi 33 GPU Architecture Design “Rumoured”

The Navi 33 GCD is expected to have 2 shader engines and each shader engine has 2 shader arrays (2 per SE / 4 total). Each shader array should previously consist of 5 WGPs (10 per SE / 20 total) and each WGP has 8 SIMD32 units with 32 ALUs (40 SIMD32 per SA / 80 per SE / 160 total). These SIMD32 units combine to form 5120 cores, which is the same core count as the RX 6900 XT (Navi 21 XTX GPU).

A preliminary block diagram of AMD’s next-gen RDNA 3-based Navi 33 GPU that will power the flagship Radeon RX 7600 XT graphics card. (Image credit: Olrak)

However, based on the new numbers, the RDNA 3 Navi 33 GPU will have a total of 16 WGPs, or 4096 cores. Now we don’t know if this is the specific configuration of the chip itself that has been updated, or if the new Radeon RX 7000 cards will feature a stripped down configuration of the Navi 33 chips with 1 disabled WGP in each shader array. It is noted that many structures of RDNA 3 are larger, smaller, or completely different than RDNA 3, making the architecture a brand new design rather than an RDNA 2 revision.

AMD’s Ryzen 7000 “Raphael” CPUs with 5nm Zen 4 technology are slated to go into mass production this month

Navi 33 will essentially be a Navi 23 replacement on the GFX11 architecture, and we know that Navi 23 only has 2048 cores, half the amount said to be on Navi 33. The Navi 23 GPU was featured on the Radeon RX 6600 series cards, so unless AMD wants its lineup to feature the Navi 31, which the RX 7900 series, Navi 32 that drives the RX 7800 series and Navi 33 that drives the RX 7700 series up a notch. The RX 7600 range and below would end up being based on that updated 6nm RDNA-2 GPUs as reported here.

AMD RDNA 3 Navi 3X GPU configurations (preliminary)

GPU name GPS 21 GPS 33 GPS 32 Navi 31
GPU process 7nm 6nm 5nm/6nm 5nm/6nm
GPU package Monolithic Monolithic MCM MCM
shader engines 4 2 4 (2 for GCD) 6 (3 for GCD)
GPU WGPs 40 20 40 (20 per GCD) 60 (30 per GCD)
SPs per WGP 128 256 256 256
Computing Units (per Die) 80 40 80
160 (total)
120
240 (total)
cores (per die) 5120 5120 5120 7689
colors (overall) 5120 5120 10240 15360
memory bus 256-bit 128-bit 192-bit 256-bit
storage type GDDR6 GDDR6 GDDR6 GDDR6
Infinity Cache 128MB 128-256MB 384MB 512MB
Flagship SKU Radeon RX6900XTX Radeon RX7700XT? Radeon RX7800XT? Radeon RX7900XT?
TBP 330W ~200W ~300W ~400W
Start Q4 2020 Q4 2022? Q4 2022? Q4 2022?

AMD Navi 33 GPU features, pricing, performance ‘rumored’

The Navi 33 (RDNA 3) is expected to include 128-256MB Infinity Cache. The GPU would also have 2 memory connection links (32-bit). That’s a total of 4 32-bit memory controllers for a 128-bit bus interface. Since the memory has been reduced by half compared to the 6900 XT, the card will have lower power consumption. It will also help AMD lower the cost in the BOM and offer cards with this performance range in the $400-$500 price range.

In terms of performance, the AMD Radeon RX 7700 XT based on the Navi 33 GPU is expected to offer 6900 XT-class performance or better performance in ray tracing, but given the reduced memory design, it will take a hit as the resolution increases . So the card would be faster at around 1080p and similar at 1440p, but gets the same or slower at 4K and up due to the 8GB VRAM limitation. Ray tracing is expected to be a strength given the card’s 6900+ XT performance. Now 8GB might sound like a downgrade from the 6900 XT, but given the price it might actually turn out to be a great decision that not only reduces costs but also allows larger quantities of the card to be manufactured without worrying about GDDR6 supplies .

This would push the performance of the AMD Radeon RX 7600 series above the RX 6800 and RX 6900 series at a TDP of around 200W (180-230W). There is also talk of the PCIe interface being Gen 5.0 along with an x8 link and that doesn’t seem to be a cause for concern as Gen 4 and Gen 3 x8 links can provide the card with enough bandwidth. Efficiency will be a really strong suite of AMD’s RDNA 3 and the red team will have a significant lead NVIDIA’s GeForce RTX 40 “Ada Lovelace” series who are expected to be very power hungry, but they are there things are also boiling up with the green ones which we may soon hear from reliable leakers.

AMD RDNA Generational GPU Lineup

Radeon Lineup Radeon RX5000 Radeon RX6000 Radeon RX7000 Radeon RX8000
GPU architecture RNA 1 RDNA 2 RDNA 3 / RDNA 2 RNA 4
process node 7nm 7nm 5nm/6nm? 5nm/3nm?
GPU family Navi 1X 2X ships 3X ships 4X ships
flagship GPU N / A Navi 21 (5120 SPs) Navi 31 (15360 SPs) GPS 41
High-end GPU Navi 10 (2560 SPs) Navi 22 (2560 SPs) Navi 32 (10240 SPs) GPS 42
Mid-tier GPU Navi 12 (2560 SPs) Navi 23 (2048 SPs) Navi 33 (5120 SPs) GPS 43
entry-level GPU Navi 14 (1536 SPs) Navi 24 (1024 SPs) Navi 34 (2560 SPs) GPS 44

AMD Navi 31 & Navi 32 “High-End Radeon RX 7000” GPU teaser

In the end, MLID also shared what appears to be the first look at the high-end AMD Navi 31 and Navi 32 GPUs with MCM design and the corresponding Radeon RX 7000 series graphics card, which will appear to have high-end fluidity. chilled designs out of the box. The card renderer shown is a dual 8-pin design with a dual-slot design and a 120mm AIO cooling solution. MLID has stated that it will provide more details on these products in part two of the ongoing AMD RDNA 3 leaks.

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