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prakalejas
Journeyman III

7950X3D + RTX 4090 + 2 NVMe SSD = GPU boots only with x8 4.0 link speed

I had troubles with stability running system for a week with all settings to Auto and one day, GPU was not detected at all. Changed MB from Gigabyte B650M to Asus B650M and found an option to manage PCIe bifurcation, which helped to bring back dedicated GPU back to life. But it runs only in x8 link speed (tried options x8x8, GPU w/ M.2 SSD). Auto gets me back to GPU not recognized.

As far as I understand, GPU should get x16 from CPU, M2_1 - x4 from CPU and M2_2 - x4 from chipset (and should run on full auto bios setting). (20 CPU lanes, 4 Chipset and 4 lanes to spare)?

Is my CPU defective or is it normal limit?

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