AMD Radeon RX 7900 XT Board Design Revealed: 24GB and 450W

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AMD’s upcoming Radeon RX 7900 XT design has been dissected by our colleagues from Igor’s Lab, who printed (sanitized) schematics of the upcoming product. That is set to be one of many greatest graphics playing cards when it launches as AMD’s flagship RX 7000-series RDNA 3 GPU within the coming months. GPU designers have a tendency to maximise efficiency on their flagship choices, which is why fashionable high-end GPUs are complicated, massive, energy hungry, and require a really subtle energy supply subsystem coupled with a complicated cooling system. AMD’s new halo half isn’t any exception.

The Radeon RX 7900 XT will use the codenamed Navi 31 GPU based mostly on the RDNA 3 structure. It’s going to hook up with 24GB of GDDR6 reminiscence utilizing a 384-bit interface, with a chiplet design. The GPU is rumored to consist of 1 graphics chiplet die (GCD) in addition to six reminiscence chiplet dies (MCDs) interconnected utilizing AMD’s Infinity Cloth. The GCD will likely be extra complicated than AMD’s current-generation Navi 21 GPU, and ship considerably extra efficiency. To that finish, it’s going to require extra energy than the present half.

In accordance with Igor’s Lab, AMD’s reference Radeon RX 7900 XT will characteristic three 8-pin auxiliary PCIe energy connectors able to delivering as much as 450W of energy — plus one other 75W from the PCIe slot, although that may seemingly go largely untapped. This comes from printed circuit board schematic obtained by Igor, after which “sanitized” to take away any distinctive markings that trace on the producer(s) of the board.

Igor says he has seen a number of board design schematics, and all of them have a number of issues in widespread. The boards will reportedly use 21 voltage regulator modules (VRMs) that may unfold eight ‘foremost’ phases throughout the GPU core, GPU system-on-chip, GPU reminiscence controller, and GDDR6 reminiscence. To a point, AMD’s reference design for the Radeon RX 7900 XT resembles that of the Radeon RX 6900 XT, however it has one additional 8-pin energy inputs and is optimized for larger currents and energy. 

(Picture credit score: Igor’s Lab)

Talking of auxiliary PCIe energy plugs, it’s noteworthy that this design makes use of three 8-pin connectors and never one 12VHPWR (12+4-pin) energy connector, which makes use of the brand new PCIe 5.0 normal and is about for use by Nvidia’s upcoming flagship options. It’s unclear whether or not AMD is sticking to this design on its closing boards, however a few of its companions with customized PCBs may definitely undertake the most recent auxiliary PCIe 5.0 connector.

So far as show outputs are involved, AMD reportedly plans to put in three DisplayPort and one HDMI connector on its reference card, and it’ll not present a USB-C connector for Digital Hyperlink. It is nonetheless unclear whether or not AMD’s upcoming graphics playing cards will assist DisplayPort 2.0 and/or HDMI 2.1 48G. We suspect the reply is “sure,” although as with Intel’s Arc Alchemist, precise capabilities may be lower than the utmost spec.

Since AMD’s Radeon RX 7900 XT and different RDNA3-based graphics playing cards are set to hit the market this fall, makers of add-in-boards are in all probability finalizing their PCB and cooling system designs for the upcoming merchandise. Igor factors out that there may be some adjustments from the present PCB schematics on closing merchandise, however at the least we now know that AMD shouldn’t be afraid of excessive energy consumption for its next-generation flagship graphics product.

It is also fully potential for AMD to proceed to change specs at this level. The board designs may be kind of full, however GPU shader core counts, clock speeds, and reminiscence speeds are all doubtlessly in a state of flux — and pricing “leaks” are mainly simply guessing at this stage. As with all unofficial info, apply a touch of skepticism, although Igor did not really present any laborious numbers on the core specs.

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