So I'm still waiting on some parts to come in so i can't power on and fully test, but before i even connect things i've been trying to work out the math so i can be totally sure and not fry anything.I have a Gigabyte Aorus X570 Elite motherboard which has 2 5v aRGB headers and a kit of some Swiftech watercooling gear and fans.
Thats 6x of the Helix 120 Iris fans which have 18 LEDs each. Each fan also has a daisy-chain connector for the RGB to connect to another fan, and the PWM connector is separate. So my issue is regarding just the LEDs since i can figure that out separately. The waterblock included with their Boreas kit also has 6 RGB LEDs as well, and so does the pump/res combo unit. So i'm looking at about 120 LEDs total.
Their kit includes a controller hub powered by a SATA power connector where all the fans and RGB connectors can connect to, but to change the colors i would have to open the case to reach in and push the button on this controller. No motherboard control. So i ordered their MB Link adapter that lets you connect their RGB connectors to the motherboard for software control. Well that adapter only has 3 RGB headers. But wait, each fan has a daisy chain connector for the RGB, so i can just keep connecting things via those since the MB link adapter doesn't have enough connections. I know they do this to keep you from connecting too many things and frying your stuff, so they don't recommend daisy chaining. I get it. They can't assume everyone has a header that can push alot of power safely.
So with that said, the motherboard's header according to the manual states that it can push 5 amps (it also says 1000 LEDs but gigabyte support eventually told me to ignore that number, and that its all about not exceeding the amp rating of the header). Asking Swiftech how much power the LEDs on their fans use, they didn't really have an answer. So i asked them the model of LED they use so i can research it myself and they told me they believe they are ws2812 leds which use a max current of 20 mA which equals 0.02 Amps.
So it should be simple right? 5 amps max output from header is available. Swiftech Iris MB link gives me 3 connectors. I connect 3 fans (just the RGB) that each fan has an additional fan connected to it, then lastly the waterblock that has 6 LEDs to that second set of fans, and also the resevoir that has 6 LEDs to that second set of fans.
6 Fans at 18 LEDs each, totaling .36 Amp draw per fan totaling 2.16 Amps across all fans
1 waterblock at 6 LEDs totaling .12 Amps
1 pump/res at 6 LEDs (RGB connector separate) totaling .12 Amps
Resulting in total amp draw of everything daisy chained then connected to a single header of: 2.4 Amps
is that right? is it that simple or am i missing anything? Do i need to worry about voltage drop or anything like that? Am i at any risk? Thanks and sorry for the long post, trying to include as much detail as possible.
links in case you guys wanted to crosscheck anything:
WS2812 LEDs: https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
Swiftech Boreas kit: http://www.swiftech.com/boreas.aspx
Swiftech Iris MB Link: http://www.swiftech.com/iris-mblink.aspx
Iris Eco V2 controller (included with the Boreas kit): http://www.swiftech.com/iris-eco.aspx
Appreciate any feedback, thanks.