Hello,
I’m building a virtualization server with an Asrock Rack x570d4u-2L2T in a Supermicro 835. The CPU is a Ryzen 3700X at stock settings (no overclock) with a Wraith Prism cooler.
Front fans are 3x Supermicro FAN-0074L4.
Rear fans are 2x Supermicro FAN-0104L4.
My understanding, having not actually built a computer in 25 years and based mostly on YouTube videos, written articles, and thinking about how air moves in a semi-vacuum, is that I want the rear fans to exhaust at higher RPM than the front fans do intake. Is that correct?
I’ll admit I’m not 100 percent clear how CFM fits into that. I do know it’s a measure of how much air the fan can move per minute, but the spec listings talk in terms of max CFM, and I’m planning to try to run all 5 non-CPU fans as slow as possible, since the CPU has active cooling and I’m stuck trying to set this thing up in my bedroom. Where I sleep.
I got a set of sample manual fan fan settings when I bought this chassis, CPU, motherboard, and fan set used, but I’m a bit confused by them.
- Fans 1, 2, and 6 are the front fans
- Fans 4 and 5 are the rear fans
- Sample values
** Fans 1, 2, and 6 are set at 20, 22, and 22 percent of full speed, respectively.
** Fans 4 and 5 are set at 86 and 22 percent of full speed, respectively.
That 86 percent on fan 4 is really throwing me. I don’t understand why one rear fan is almost at full blast, and the other is barely on. Wouldn’t it make more sense to make them both equal at a higher setting? Like, 45 percent or something else more appropriate to match to the 20-22 percent on the front?
Or is the 86 percent needed to get enough cool air in, while running the other two much slower to minimize noise?