Is the AMD Ryzen 9 7900X3D compatible with DDR5 RAM, and if so, what is the maximum supported speed?

Yes, the AMD Ryzen 9 7900X3D is compatible with DDR5 RAM and supports a maximum speed of 5200 MHz.

Questions & Answers: AMD Ryzen 9 7900X3D - Ryzen 9 7000 Series Zen 4 12-Core 4.4 GHz - Socket AM5 120W - AMD Radeon Graphics Desktop Processor - 100-100000909 - Tray

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AMD Ryzen 9 7900X3D - Ryzen 9 7000 Series Zen 4 12-Core 4.4 GHz - Socket AM5 120W - AMD Radeon Graphics Desktop Processor - 100-100000909 - Tray