AMD’s upcoming Radeon RX 7900 XT design Igor’s laboratory, published the (sanitized) schematics of the upcoming product. This is set to be one of the best graphics cards when it launches as AMD’s flagship RX 7000 series RDNA 3 GPUs in the coming months. GPU designers tend to maximize the performance of their flagship products. This is why modern high-end GPUs are complex, bulky, power hungry, and require highly sophisticated power delivery subsystems combined with advanced cooling systems. AMD’s new Halo part is no exception.
The Radeon RX 7900 XT will use the codenamed Navi 31 GPU which is based on the RDNA 3 architecture. It connects to 24 GB of GDDR6 memory using a 384-bit interface in a chiplet design. The GPU is rumored to consist of 1 Graphics Chiplet Die (GCD) and 6 Memory Chiplet Dies (MCD) interconnected using AMD’s Infinity Fabric. The GCD will be more complex than AMD’s current generation of his Navi 21 GPUs and offer significantly better performance. That would require more power than existing parts.
according to Igor’s laboratory, AMD’s reference Radeon RX 7900 XT features three 8-pin auxiliary PCIe power connectors capable of delivering up to 450W of power, plus an additional 75W from the PCIe slot, which is likely to go largely unused. This is from a printed circuit board schematic received by Igor that has been “sanitized” to remove the characteristic markings suggesting the board’s manufacturer.
Igor says he has seen multiple board design schematics and they all have some things in common. The board reportedly uses a GPU core, a GPU system-on-chip, a GPU memory controller, and 21 Voltage Regulator Modules (VRMs) that distribute the eight “main” phases across the GDDR6 memory. . AMD’s Radeon RX 7900 XT reference design is somewhat similar to the Radeon RX 6900 XT reference design, but it has one more 8-pin power input and is optimized for higher current and power. .
Speaking of the auxiliary PCIe power plug, the 12VHPWR (12+4 pin) that this design uses three 8-pin connectors, uses the new PCIe 5.0 standard, and is set to be used on Nvidia’s upcoming flagships. It’s worth noting that it doesn’t use the power connector. solution. It’s unclear if AMD is sticking with this design on their final boards, but some of their partners with custom PCBs could certainly adopt the latest auxiliary PCIe 5.0 connectors.
As far as display outputs go, AMD is reportedly planning to install 3 DisplayPort and 1 HDMI connectors on the reference card and will no longer offer a USB-C connector for Virtual Link. It’s still unclear if AMD’s upcoming graphics cards will support DisplayPort 2.0 and/or HDMI 2.1 48G. It may be lower than the specification.
AMD’s Radeon RX 7900 XT and other RDNA3-based graphics cards are set to hit the market this fall, so add-in board makers are probably finalizing the PCB and cooling system designs for their upcoming products. I’m here. Igor points out that there may be some changes from the final product’s current PCB schematics, but at least AMD isn’t afraid of the high power consumption of its next-generation flagship graphics products. I already know.
It’s also entirely possible that AMD will continue to change specs at this point. Board design may be nearly complete, but GPU shader core counts, clock speeds, and memory speeds may all be in a state of flux, and price “leaks” are basically at this stage. So it’s just a guess. As with all unofficial information, be a little skeptical.
