The only fan controllers that can handle 3-4 amp fans are lamptrons?
There aren't any other fan controller companies that have high amp fan support. I have 2 VA450DC fans. Which are 3.3A so they max out around 39w-40w. I don't really care for the Lamptrons. I checked out the fanatic and it pretty much only allows 7v-5v or 12v switch.The Sunbeam Rheobus Extreme looks good but maxes out at 30w. I want to be able to turn the fan to around 7v-10v when necessary.
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You could just pick up a PWM splitter and regardless run the fans off 3 pins while control them via an available motherboard header or the CPU fan header.