Case Fan Hub and Motherboard Controlled Case Fan Speeds

My computer case has a fan hub for plugging the CPU fan and case fans into. The fan hub also has a cable to plug the fan hub into the CPU fan connection on the motherboard. The power to the hub is supplied by the PSU with a SATA 6 power supply connection. The motherboard manual says that the board will adjust the fan speeds based on CPU temperature. Right now, I have the CPU fan plugged directly into the motherboard. And my three case fans plugged into the fan hub on the case. All the fans seem to work correctly. Starting when the computer is turned on, and stopping when the computer is off or in stand by mode. When I look at the BIOS, the temperature of the CPU is displayed and the CPU fan information is displayed. But, the fans that are plugged into the fan hub are not displayed.

If I plug the CPU fan into the hub and then plug the hub into the CPU fan connection on the motherboard, will the BIOS display the information for the case fans and will the motherboard be able to control the speed of the case fans based on the CPU temperature as if the case fans were directly plugged into the motherboard?

Motherboard: ASRock X470 Master SLI/AC AM4 AMD Promontory X470 SATA 6Gb/s USB 3.1 HDMI ATX AMD

Case: Fractal Design Define R6 Gunmetal Brushed Aluminum/Steel ATX Silent Modular Tempered Glass Window Mid Tower

OS: Linux Mint 19.1

At what shutter speeds is mirror lock-up worthwhile?


I know what mirror lock-up is and what it’s good for, but I’m curious about the range of shutter speeds where it provides a real benefit.

A little background

I use a nice, sturdy tripod for shooting still life photos, and sometimes portraits. More often than not for still life shooting, I use live view either because the camera is at an odd height or angle, or because I’m shooting in very low light that makes it difficult or impossible to compose and focus through the viewfinder.

There are previous questions that ask about whether the mirror flips back down and then up again during live view shooting. In my camera the answer is yes (detail further down). This means that if I want to use both live view and mirror lock-up, I need to compose in live view, then disable live view, then shoot with mirror lock-up plus timer or remote, then re-enable live view to play around more and recompose. This is pretty disruptive, to say the least, so I’d like to understand when it’s worth the trouble.

The Blanston Hypothesis

It seems that if the shutter speed is fast enough, then any vibration of the camera would be insignificant because the image is captured too fast for the camera to move too much during the exposure. And it seems that if the shutter speed is slow enough, the short amount of time that the camera vibrates wouldn’t matter because it would be buried below the noise of the capture (assuming very low light, no flash, etc.). So I figure there must be a range of shutter speeds where mirror lock-up makes a difference in image quality. It wouldn’t surprise me if it’s related to focal length, sort of like the 1/(focal length x crop factor) guideline for non-IS handheld shooting.


So, as the title states, at what shutter speeds is mirror lock-up worthwhile? Is my reasoning correct (or at least sane)?

The detail I promised you earlier

This answer indicates that live view does accomplish mirror lock-up using a Canon 70D, but my experience with my 80D indicates otherwise.

When I use mirror lock-up in normal (non-live view) mode, I can clearly hear that the first curtain noise at the beginning of the exposure is a very minor “tick” sound, which makes sense. I do this with a suitably long shutter speed (say 1 second or more), so that I can clearly separate the sounds at the beginning of the exposure from the sounds at the end, when the mirror flips back down.

However, when I use live view, I can very clearly hear the mirror moving at the beginning of the exposure. Also, when I’m in live view mode, the mirror lock-up option is grayed out in the menu, which indicates that it’s not available in that mode.

How can I go about debugging my VPS’ upload (POST) speeds?

I have just purchased a $ 20 VPS from DigitalOcean and I ran some tests on it after installing the LAMP (7.2 PHP, 5.7 MySQL, CentOS 7) and running the speedtest test:

Retrieving server list... Selecting best server based on ping... Hosted by Interserver, inc (Secaucus, NJ) [2.67 km]: 3.076 ms Testing download speed................................................................................ Download: 355.58 Mbit/s Testing upload speed................................................................................................ Upload: 834.49 Mbit/s 

All dandy…except, whenever I try to upload anything to the server itself through WordPress’ interface, it starts at ~4mb upload, then immediately drops to max 20kb / sec and because of the max execution time being set to 30, I can’t upload anything of importance.

So let’s test the write / read speeds:

dd if=/tmp/input.dat  of=/tmp/output.dat  bs=1000M  count=1000  oflag=dsync 0+1 records in 0+1 records out 536870912 bytes (537 MB) copied, 1.31683 s, 408 MB/s 

Looking good. I even set the usual culprits such as max_upload_size and post_max_size as well as others to absurd amounts just to see if that’s really the bottleneck but no luck.

Something smells here as I’m sure DO, a respectable company, even on their somewhat cheap VPS would still manage to not make them completely useless.

What could I use to debug this further? It makes me think that there’s some PHP misconfigutation.