I replaced 1 low speed with 2 medium speed, connected to my existing digital thermostat works great, cabinet barely gets above 85 now. The low speed single fan worked great but i needed more cooling power for my cab was getting in mid 90's, the 2 mediums did the trick and are still very quiet. Quality stuff they sell.
2nd order with Cooler Guys, bought a nice 120mm fan for the PC case, the order was processed and shipped quite fast as was the last one.
I'm becoming a big fan of Cooler Guys...fast, safe service and quality products at good prices.
If you buy one 120X120X25MM 3 PIN FAN LOW/MEDIUM/HIGH SPEEDS make it the one from CoolerGuys.