High-resolution PCB Pictures

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Circuit Board (PCB) Analysis

GPU voltage is a 12-phase design, managed by a Monolithic Power Systems MP2857 controller.


Monolithic MP87997 DrMOS components are used for GPU voltage; they are rated for 70 A of current each.


Memory voltage is a 2+1-phase design, managed by two Monolithic Power Systems MP2856 controllers.


For memory, Monolithic MP87997 DrMOS with a 70 A rating are used here, too.


The GDDR6 memory chips are made by Samsung and carry the model number K4ZAF325BC-SC20. They are specified to run at 2500 MHz (20 Gbps effective).


The GPU chip on the Radeon RX 7900 GRE is Navi 31, but it looks quite different to the chips on the RX 7900 XT and XTX. The physical size of the package is reduced, due to its roots in the mobile space. You still get the full-size GCD (graphics compute die) in the center, surrounded by four MCD (memory cache dies). The other two MCDs that you see pictured are non-functional dummies that are used to ensure structural stability of the chip, when a cooler is pushing down on it. While they look similar, the MCDs are not HBM chips. The MCDs are fabricated on a 6 nm process at TSMC Taiwan with a die size of 36.6 mm² each, the GCD is fabricated using TSMC's 5 nanometer node, with a die size of 300 mm². The combined transistor count of the GPU is 57.7 billion.