December 2, 2022

Leaked AMD Radeon RX 7900XT PCB layout with Navi 31 GPU and three 8-pin power connectors


Please note that this message is marked as a rumor.

AMD Radeon RX 7900XT Circuit Board Alleged

Igor Wallossek share a first look at the design of the unreleased RDNA3 graphics card.

AMD RDNA3 graphics processor, Source: AMD

Igor doesn’t want to fight with leaks sharing various specs for AMD or NVIDIA GPUs. These have been everywhere lately, but the closer we get to the launch of a new series, the more accurate they become. Meanwhile, Igor managed to get the schematics for the new AMD Radeon card, supposedly the RX 7900XT. It could be a custom variant, though.

The layout confirms that the RX 7900XT is equipped with the AMD Navi 31 GPU with 7 chiplets. The board is powered by three 8-pin power connectors, which means a maximum output of 450W, he notes. This doesn’t rule out AMD using 16-pin 12VHPWR connectors, but so far we haven’t seen any indication of this.

AMD Radeon RX 7900XT PCB Layout, Source: Igor’sLAB

Igor confirms that the RX 7900XT has a total of 24 GB of GDDR6 memory, which is located in groups of 4 around the GPU. The board is equipped with 21 voltage converters, which should be divided between GPU, memory, SOC and VDDCI.

The card is revealed to have four display connectors, three DisplayPorts and one HDMI. There is no information on the supported standard, but it is very likely to be DisplayPort 2.0 and HDMI 2.1 at this point.

AMD RX 7900XT is rumored to feature a full Navi 31 GPU with 12288 stream processors. The GPU uses one GCD (Graphics Die) and six MCDs (Memory dies). The 1-stack MCD is claimed to provide up to 96MB of Infinity Cache.

AMD already showcased its RDNA3 GPU in a short gameplay demo last month. The company has yet to reveal a launch date for its new Radeon RX 7000 series, but we may hear more once the Zen4-based Ryzen 7000 series of processors become available.

RUMOR AMD NAVI 3X (RDNA3) GPU Specifications
Code names “Plum Skipjack” “Wheat Nas” “Bright Pink Bonefish”
Manufacturing node TSMC 5nm+6nm TSMC 5nm + 6nm TSMC 6nm
GPU package Multi-Chip Module (MCM) Multi-Chip Module (MCM) Monolithic
Chip configuration 1x GCD + 6x MCD 1x GCD + 4x MCD
GCD size ~308mm² ~200mm²
MCD 6x ~37.5mm² 4x ~37.5mm²
Full GPU ~533mm² ~350mm² ~203mm²
Shader engines 6 3 2
Shader tables 12 6 4
RDNA Working Groups (WGP) 48 30 16
Calculation units 96 60 32
Stream processors 12288 7680 4096
Memory and Bus 384-bit GDDR6 256-bit GDDR6 128-bit GDDR6
Memory bandwidth 864 GB/s (18 Gbps) 576 GB/s (18 Gbps) 288 GB/s (18 Gbps)
Infinite cache 96 MB 64 MB 32 MB
PCIe interface PCIe Gen5 PCIe Gen5 PCIe Gen5
Exit Q4 2022 2023 To confirm
Rumored SKU Radeon RX7900XT Radeon RX7800XT Radeon RX7600XT
All information based on rumours. (Updated: September 15, 2022)

Source: Igor’sLAB

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