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AMD Navi 31 (rDNA 3): A Look at the Radeon RX 7900 XT’s Putative PCB

AMD Navi 31 (rDNA 3): A Look at the Radeon RX 7900 XT's Putative PCB
Image: AMD

While Nvidia is likely to take the wraps off the GeForce RTX 4000 in five days, after months of wildly speculation and leaks have become more concrete lately, AMD’s Radeon RX 7000 with RTX 3 architecture has recently been very quiet again. It is done. Igor’s lab One breaks the silence with the schematics of the Radeon RX 7900 XT’s PCB.

Drawing based on reliable sources

Leaked on Twitter with critical reference to the contest and the repeated disputes between the parties involved Igor’s lab A large number of reliable sources as the basis for a specially made drawing – what is shown corresponds to reality, can be classified as high. Drawing “lowest common denominator“In the current photos, CAD drawing and description. It should show a so called custom design, although it should be closer to AMD’s reference.

custom design base

The fact that three 8-pin PCIe connectors are soldered onto the circuit board fits the custom design character, whereas until recently it was assumed that AMD would get by with two 8-pins on reference designs. With two of these sockets, however, power loss should not exceed 300 watts (150 watts per 8-pin connector and a maximum of 75 watts via PCIe) and custom designs should be higher than they are already doing today. Huh.

In all likelihood, AMD won’t rely on the new 12(+4)-pin 12VHPWR connector just yet, which allows up to 600 watts through just one cable strand. However, there is no certainty at this point. At Nvidia, both the Founders Edition and Custom Design should be based on the new standard at the upper end of the performance range.

This is what the PCB reference design of the Radeon RX 7900 XT should look like
This is what the PCB reference design of the Radeon RX 7900 XT should look like (Image: Igor’s Lab)

The custom designs of the Radeon RX 7900 XT can be noisy Igor’s lab Up to 21 voltage converters, 16 of which provide double the mains voltage VDDC_GFX, memory, VDD_SOC and VDDCI in 8 phases, while five more provide auxiliary voltage. This is not speculation, but is safe based on existing circuit designs.

Navi 31 with 6+1 Chipset

In addition, the scheme confirms the structure of the Navi 31, which had already been reliably traded in the rumor mill, as one graphics compute die (processing unit) and six memory control die (memory chip including Infinity Cache). Are included.

Of the six memory controllers, two 2 Gb GDDR6 chips each have to be addressed via 32 bits, resulting in 24 Gb via a 384-bit interface. One HDMI and three DisplayPort ports are to be offered as connections.

This is what AMD’s RDNA 3 GPU could look like

Radeon RX 7000 will be released in 2022

AMD recently confirmed that the RDNA 3 will be launched later this year and has shown a working system with Ryzen 7000 and RDNA 3 GPUs. However, AMD is yet to give exact dates or products.

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