Question How many fans I can connect on system fan header on motherboard?

Nemezis1313

Honorable
Jul 8, 2015
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Hi. I have recently changed components on my old rig. I have changed MB, CPU and RAM. Everything is working fine, but because I bought AMD Ryzen 2600X I had to install more fans in my case. I have installed two Arctic bionix f140 fans at the front of my case to draw cool air into the case. My MB is Gigabyte b450m ds3h. It only has two headers, one for CPU and other is system. I didn't know is it safe to plug fans on MB with the stock Coolermaster fan at the back of the case in just sys header, so I connected fans to PSU directly with molex, and now the fans are at full speed all the time and they are loud. Is it safe to connect 3 fans on system header for MB to control them and if not, what are my options?
Thanks
 

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