AMD RDNA 3 Big Navi 31 ‘Radeon RX 7900 XT’ GPU Could Feature Up To 15,360 Cores, Compute Units Dropped In Favor of WGP

A brand new rumor regarding AMD's next-generation and flagship RDNA 3 GPU, the Big Navi 31, which is going to power the Radeon RX 7900 XT graphics card, has been published by Beyond3D forums (via 3DCenter). The rumor suggests that AMD is dropping a very popular GPU terminology from its RDNA 3 lineup.

AMD Radeon RX 7900 XT 'Big Navi 31' RDNA 3 GPU To Feature Up To 60 WGPs For A Total of 15,360 Cores

We are seeing a lot of rumors regarding AMD's RDNA 3 GPUs pop up recently. Last we heard, the AMD Big Navi GPU within the RDNA 3 lineup, the Navi 31, was going to feature 240 Compute Units or 120 CUs per die for a total of 15,360 cores. But Beyond3D forum member, Bondrewd, is quite confident that the era of the CU or Compute Unit is over and AMD is moving over to WGP or Work Group Processors as the main core block of its next-generation GPUs.

The Compute Unit has been the fundamental block of the AMD GPU family for almost a decade but with next-generation MCD (Multi-Chiplet Die) GPUs, the overall number of CUs is going to increase dramatically. As such a dramatic change is also required and AMD might have decided to use WGP as the main compute block. As reported previously, each Navi 31 GPU die will feature 30 WGPs and 256 stream processors per WGP. This will give 7,680 cores per die and 15,360 cores in total.

Also what's interesting is that both KittyYYuko & Kopite7kimi state that AMD RDNA 3 'Big Navi 31' flagship could feature 60 WGPs which equals 120 Compute Units. There's also speculation regarding a very different CU design for chiplet based GPUs and the standard monolithic offerings such as Navi 33. There are also significant improvements to the front-end shader engine.

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— Elysian Realm (@KittyYYuko) July 26, 2021

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— kopite7kimi (@kopite7kimi) July 22, 2021

The memory design gets more interesting as AMD RDNA 3 GPUs are going to go insane on the Infinity Cache solution. The Navi 31 'Radeon RX' GPUs are expected to feature up to 512 MB of Infinity Cache, almost quadruple the amount featured on Navi 21 but retain the 256-bit bus interface. The cards are expected to retain GDDR6 memory dies but with faster & optimized frequency/power specs.

https://twitter.com/greymon55/status/1415837736943054856

https://twitter.com/greymon55/status/1418130096959885319

There have been several rumors stating that the upcoming RDNA 3 GPUs are going to outperform whatever NVIDIA has to offer in terms of rasterization performance. It looks like AMD will take the lead by offering the first MCM-powered GPUs under its Radeon RX graphics card lineup. But at the same time, NVIDIA is expected to quickly transition to its MCM GPU lineup which will offer over 3x performance boost over Ampere GPUs. Following is the expected performance increase:

AMD RDNA GPU (Generational Comparison) Preliminary:

GPU Name	Navi 10	Navi 21	Navi 31
GPU Process	7nm	7nm	5nm/6nm
GPU Package	Monolithic	Monolithic	MCD (Multi-Chiplet Die)
Shader Engines	2	4	6
GPU WGPs	20	40	48
SPs Per WGP	128	128	256
Compute Units (Per Die)	40	80	192
Cores (Per Die)	2560	5120	12288
Cores (Total)	2560	5120	12288
Peak Clock	1905 MHz	2250 MHz	~3000 MHz
FP32 Compute	9.7	23	~75
Memory Bus	256-bit	256-bit	384-bit
Memory Type	GDDR6	GDDR6	GDDR6
Memory Capacity	8 GB	16 GB	24 GB
Infinity Cache	N/A	128 MB	96-192 MB
Flagship SKU	Radeon RX 5700 XT	Radeon RX 6900 XTX	Radeon RX 7900 XT
TBP	225W	330W	350W
Launch	Q3 2019	Q4 2020	Q4 2022

The AMD RDNA 3 'Navi 3X' GPU-powered Radeon RX graphics card lineup is expected to offer up to 3x performance improvement over existing RDNA 2 offerings. It would mark a major leap forward for graphics evolution and now that AMD is already onboard with next-gen technologies such as FSR and Raytracing, expect a very heated next-gen competition between the red and green teams.

News Source: via Videocardz

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