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This is our Failure Analysis report of the AMD Ryzen 7800X3D CPUs that exploded on our test benches -- some as a result of over-current, some as a result of degradation leading to failure. We worked with an external Failure Analysis Lab to evaluate the result of AMD 7800X3D CPUs getting too much voltage (VSOC especially) and likely too much current, especially in scenarios where ASUS OCP fails to do anything useful. This complements our prior Root Cause Analysis we performed in part 1, linked below, and uses a scanning electron microscope, C-mode scanning acoustic microscopy, and more to investigate a burned CPU that came out of an ASUS board.

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WATCH PART ONE:    • We Exploded the AMD Ryzen 7 7800X3D &...  

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TIMESTAMPS

00:00 - Failure Tests
01:57 - Root Cause & Failure Analysis
03:28 - Why We Work with a Lab
04:35 - What We Have
05:01 - External Physical Inspection
06:25 - Scanning Acoustic Microscopy
09:20 - X-Ray Analysis: 2D Scan
10:22 - 3D CT Scan
11:36 - High Magnification Microscopy
12:59 - Energy Dispersive X-Ray
14:17 - Cross-Sectioning the CPU
18:01 - CRAZY Scanning Electron Microscope Xsec
20:34 - Conclusion of Failure Cause

Correction: 06:59 Should read kV, not KHz

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Writing, Host: Steve Burke
Writing: Patrick Lathan
Video: Mike Gaglione
Video: Vitalii Makhnovets