Running at the minimum leaves little to no safety margin and can result in:
Black screens under load
Sudden reboots
GPU fans ramping to 100%
Driver crashes or TDR errors
Power protection shutdowns
Connector overheating or sense-pin misdetection (12V-2×6 / 12VHPWR)
Modern GPUs can briefly draw 2× their rated power during millisecond-level spikes. If the PSU is already near its limit, it may trip protection or drop voltage.