You can run it with one fan short on the PSU, supplement the cooling with an adequate external fan and put the miner low to the ground. Tip: Lay the miner sideways with the PSU side down, ensuring your heat sinks are face-up and won't allow failing solder to cause the heat sink to fall off and short out the unit. Sometimes this can also re-flow failing solder/solder balls and fix over-voltage issues.