AMD Radeon RX 6900 XT Review - The Biggest Big Navi 191

AMD Radeon RX 6900 XT Review - The Biggest Big Navi

Test Setup »

High-resolution PCB Pictures

These pictures are for the convenience of volt modders and people who would like to see all the finer details on the PCB. Feel free to link back to us and use these in your articles or forum posts.

Graphics Card Teardown PCB Front
Graphics Card Teardown PCB Back

High-res versions are also available (front, back).

Circuit Board (PCB) Analysis

GPU Voltage, VRM Configuration
GPU Chip Voltage Controller

AMD is using a 13-phase GPU VRM design, which is powered by an expensive Infineon XDPE132G5D 16-phase VRM controller. This is one additional phase compared to the RX 6800 XT.

AMD is using International Rectifier TDA21472 DrMOS components on the Radeon RX 6900 XT.

Memory Chip Voltage Controller
Memory Voltage, VRM Configuration

Memory voltage uses a 3-phase design controlled by an International Rectifier IR35217 controller.

AMD "Navi 21" relies on an external USB 3.2 controller for the USB-C port, supplied by Cypress Semiconductor and labeled "CYPD5137-40LQXI." This controller puts out 10 Gbps USB 3.2 Gen 2, DisplayPort passthrough, and 27 W power delivery.

Graphics Card Memory Chips

The GDDR6 chips are made by Samsung, carry the model number "K4ZAF325BM-HC16," and are rated to run at 16 Gbps.

Graphics Chip GPU

Built on the same TSMC N7 (7 nm) node as Navi 10, the Navi 21 silicon is spread across a 519.8 mm² die-area and packs 26.8 billion transistors. The pinkish-red tinge we saw on the "Navi 10" is gone.
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Jun 28th, 2022 11:18 EDT change timezone

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