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Yeah that's a good point to call out @Mithril. The air is generally turbulent coming out of the first fan in a series, which if stacked with no separation from the second fan will lead to more noise, and probably a loss in efficiency in the subsequent pressure drop. The two treatments to this...

So I went deep down the rabbit hole and did a more formal analysis of the cooling requirement. I didn't want it to get lost in the sea of posts in this thread, so I've created it as a resource here. Warning: there's an extreme amount of over-engineering. The outcome was that 3x Sunon...

1. Introduction I've recently been through the process of trying to modify the fan configurations of a number of my servers from the stock OEM configuration to something else to reduce the amount of noise they produce. These servers were often designed without noise output as a meaningful...

are you able to share a picture of yours?

So the datasheet on these indicates they have 150 CFM (excellent), 0.571 inwg static pressure and are rated for 53 dbA noise. In contrast the stock fan (at least in my 847) is a Nidec V80E12BHA5-57, which has 73 CFM, 1.09 inwg (i think?) and 53.5 dbA noise. There are 7 stock fans for a total of...

I just got an ICX7250-24P, and as many have attested, it's too loud. I'm seeing ~65dB at start up that comes down to ~55dB steady state. At idle (only OOB MGMT interface active), I have the following stats: SSH@icx7250-24p-router>show chassis...

cross posting here because I suspect this is of interest to people in this thread as well. In the pursuit of making my X10QBi quiet, I've been digging into ipmitool raw commands to better understand how it works, with some limited success. If you have an interest in understanding fan control for...

I've spent some more time digging into the above commands and understanding the ipmitool raw interface generally a bit better. For the purpose of fan control on the X10QBi, I've learned the following: The netfn argument is always 0x30 The cmd argument is 0x91 to write data to the interface, and...

Firmware: 03.65.00 BIOS: 3.1 IPMI: 2.0 Redfish: 1.0.1 I found that it was pretty sensitive to the configuration state - the duty cycle commands wouldn't work unless I executed all of the initial fan mapping relationship commands first, so make sure as a baseline you execute every command above...

In my quest to make this thing quiet, I have replaced all of the fans. I have removed the 3x 80mm exhaust fans, and replaced the stock fan wall (4x 92mm fans) with Supermicro CSE-848 Fan Array by taggartalec, coupled with 3x Phanteks T30 120mm fans (they have a better CFM/Noise ratio than the...

This seems to be the most authoritative thread on this system, so I'll leave this here for others to find. I recently bought a used SYS-8048-TR4FT, which appears to be the newer variant with the MEM2 memory boards. When I received it, it came with 4x E7-4850v4 CPUs, and BIOS v3.1 (2018/06/12). I...