The SYS_FAN on B450M DS3H V2 supports 150 amps.
The SYS_FAN on B450M DS3H V2 supports 150 amps.
I checked online for details and found mixed opinions. Some suggest it can reach up to 2A because it’s a hybrid header, while others say it’s limited to 1A. You have four fans, three of which are RGB, and your motherboard only has one fan header, which you want to connect all of them to.
I wouldn't exceed more than 1 amp. That amount typically suffices for connecting four fans.
RGB draws its strength straight from the dedicated RGB cable. Regular RGB requires 12V while addressable RGB uses 5V. You won't have to factor in any RGB fan illumination when applying Ohm's law. Edit – Confirmed, yes, you must account for the fans, but not the LEDs.
I’m setting up my PC now and I’m careful not to risk any parts by exceeding limits. My build includes four fans.
Consider purchasing a fan hub as they are affordable and provide their own power via a SATA cable. You can connect the hub to the board and then link all the fans to it. Personally, having four fans on one connector could be pushing limits; I can't confirm this without understanding the fans' current draw and the connector's maximum amperage.
The calculation is quite straightforward once you understand it. Simply divide the voltage of a fan by its power consumption to find the required current. However, without precise values for both voltage and wattage, determining the exact amperage remains uncertain.
It varies by individual preferences. Some users enjoy it, others prefer not to. We can calculate an average... Based on Google data, a 120mm case fan typically consumes about 4 watts. Since all case fans operate on 12 volts, dividing 4 by 12 gives roughly 0.3 watts per fan. Multiplying by four results in around 1.2 watts total.