AMD Radeon RX 7000 GPU Series and RDNA 3 Architecture
We are now going to post the entire Radeon RX 7000 Series product information and RDNA 3 architecture information for those that would like more details and more of a deep dive into these new GPUs.
The Radeon RX 7000/7900 series improves upon performance per Watt by 54% and 165% more transistors per mm2 with a new interconnect between Chiplets that is 5.3TB/s. You can see specifically what’s new in RDNA 3 architecture below.
The Radeon RX 7900 PCB is made from premium IT-170 material with a 14-layer PCB with 4 layers of 2 oz. copper. It has 20 power-stage phases and low PCIe slot peak currents. It has 24GB of GDDR6 on the 7900 XTX, and the GPU is a Chiplet design. It has HDMI 2.1a, DisplayPort 2.1, and USB Type-C. The shroud is a die-cast aluminum shroud and the backplate is die-cast aluminum as well. It has a 10% larger vapor chamber and uses dispensed GDDR6 thermal interface material, ultra-soft MOSFET thermal interface material, and new GPU thermal interface material. The LED is RGB, and the fans support Zero-RP mode, also unique the fans have intake temperature sensors.
The Radeon RX 7000 series has a new AMD Radiance Display Engine. This supports full REC2020 coverage, 12-bit HDR color support, and of course DisplayPort 2.1 and AVI Encoding/Decoding.
RDNA 3 Architecture
We are going to post the entirety of the RDNA 3 architecture information if you’d like to learn what makes this architecture tick. The notable improvements are naturally moving to a Chiplet design with a GCD and MCDs. The GCD contains the Compute Units, Ray Accelerators, AI accelerators, Stream Processors, and such. The MCDs contains the memory controller, AMD Infinity Cache, and other I/O. In order to facilitate the high bandwidth needed to connect the chiplets AMD had to come up with its new Infinity Links technology, with high-performance fanout links that can provide up to 5.3TB/s of bandwidth across the chiplet interconnect.
RDNA 3 doubles the FP32 units. The Ray Accelerators for Ray Tracing have also been improved with better handling of ray divergence, traversal flags reducing work in the shader core, and enhanced BVH formats and construction reducing overall traversal steps.
AMD is also using the new 2nd Gen Infinity Cache. While the 7900 XTX has 96MB, less than the 128MB in the Radeon RX 6900 series, it is much faster in this new generation. They can get away with less, yet have higher performance. There is 96MB of 2nd Gen Infinity Cache, 6MB of L2 cache, 3MB of L1 cache, and 3MB of L0 cache, all of which is faster than the previous gen.