Molex fan connectors2/11/2024 ![]() ![]() ![]() So if this is the case, you could take 5v from a usb header on the motherboard and connect it to all the "detect" pins on the motherboard to make it think all molex headers have molex connectors in them. Notice they say DETECT where normally in a molex connector is 5v - so I would guess they simply check if there's 5v on that pin to figure out if you plugged a molex connector or not. In the second scenario, with a single video card you could plug the molex connector in any molex header and it wouldn't matter. In the first scenario, if you install a single video card, you would only need to connect a molex for that slot or pair of slots. The motherboard will most likely only do a "Is voltage present in the molex connectors? " check and won't actually measure how much power comes through connector. ![]() If the motherboard requires all molex connectors to be connected to the power supply or it won't start, then you could "hack it" to think you plugged the connectors. But if the motherboard is designed in such a way that the pci-e slots only get power from molex connectors (which would be dumb) then you would have to plug at least one molex connector in the motherboard. If you have a single video card in the motherboard, you could probably be fine without any molex connectors, because the slot would receive power from the 24 pin connector. The standard 3- and 4-pin fan connectors are Molex KK series connectors. each molex adds around 50 watts to those 200 watts. The three-pin version (non-PWM) is referred to by some computer technicians as a TX3 connector, but this is something of a misnomer (similar to the moniker Molex connector, referring to the once-common 4-pin ATX power connectors originally produced by AMP). That's why the motherboard added those molex connectors, to ADD some power on top of what's available through the 24 pin connector(s') 12v wires. The motherboard can give the pci-e slots some power from the 24 pin connector (there's around 150-200w available there, 2 12v wires, each good for around 9A, so 18A x 12v = 216w, but some of that goes to fan headers, maybe some onboard stuff) but if you install 4-6 video cards and each takes 60 watts, you're looking at 240-360 watts taken from pci-e slots. I'd be fine doing 50-55w on molex connectors.Ī video card is allowed to take as much as 75w from a pci-e slot : 10w on 3.3v and 65w on 12v. The maximum rating of a single molex connector is 5A per voltage (so 5A on 12v, 5A on 5v ). so in theory a sata connector can do 12v x 4.5 = 54w. The maximum rating of SATA is 4.5A (3 contacts for each voltage x 1.5A per contact = 4.5A). Wouldnt it be bad to use sata to molex because the molex port might take 75W but sata has like 60 or 65 W ? Of course don't actually use such adapter cables to actually use multiple video cards on the board. If the motherboard really wants all molex connectors to be "populated" you can also buy adapters that convert one molex or one sata into 2 molex connectors. If you have a 4 pin (RGB and 12v header on your motherboard), you could connect the 3 wires (R,G, B) to the header. The extra molex connectors would be to provide additional power to the pci-e slots, because otherwise all pci- slots would be powered from just 2 12v wires in the 24 pin connector. So you could take this strip, connect R, G and B together and connect these to one of the middle pins of your molex connector (GND) and the 12v contact to the 12v pin in the molex connector, and youll get a white strip of leds. Try turning on the motherboard with just the 24 pin connector and the cpu 4/8 pin connector. It's common for a cable to have 3-4 connectors, usually 2-3 sata and a molex connector. It is strange it shows one speed but a voltage range.Your beQuiet power supply has "peripheral" connectors on it, in which you can plug cables that have a bunch of connectors. All are (6)4 pin headers for the fans except one and it is a 3 pin header. ![]() When you buy the fan make sure you can control the speed: If you don't own a fan you can find some fairly cheaply but you need to find out what controller you have. Set to 100%, then 40% to see if the speed changes.ĥ) Example fan profile: case fan at 40% speed until 40degC then RAMP up to 100% speed at 80degC (it will never reach 100%). May have to just try a fan).Ģ) Enable fan control in the BIOS if needed.ģ) Download and install your motherboard fan control software (motherboard support site).Ĥ) Play with the fan profile. Older motherboards may have VOLTAGE only for everything.ġ) Determine what TYPE of controller you have (not always obvious. My motherboard supports both PWM and Voltage for the case fans, but only PWM for the CPU_FAN controller. The two types are:Īdditionally the FAN controller must be capable of controlling this. MOLEX is usually not controllable, though there are some rare exceptions which work with 3-pin/4-pin adapters. *There are two types of fans that have speed control. ![]()
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