Weeks of GPU 'fallen off the bus' crashes turned out to be an underpowered 450W PSU
El_90 · reddit · 2026-09-08
After weeks of "GPU has fallen off the bus" crashes — model loads fine, crashes on first prompt — the author swapped riser cables, BIOS settings, oculink, GPUs, and kernel params to no avail. The culprit: a reputable-brand 450W PSU that couldn't handle PCIE plus 12vhpwr power. A 550W swap made the system instantly stable.
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