What are the rubber circles for on the back of my pc case? Should I just leave them like that if don’t have a need for them? Or are they likely to let I’m dust into the motherboard?

Edit: thanks for all the replies, so just for water cooling I have no need for.

165 points

They are external ports for water cooling. They allow you to run the pipes to an exterior location, and I have never seen anyone use them ever. I would leave the rubber grommet as it generally looks nicer than the hole.

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29 points

This is the correct answer - I know because I was there 10000 years ago and had to decide between this and buying a special case from koolance. Amusingly they still sell one for the outside.

They can also be handy if you have to do anything weird like route display cables from the GPU to the motherboard like for a thunderbolt display.

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5 points

Is water cooling for PC gaming still a thing? It’s been 10+ years since I followed any trends.

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14 points

Air cooling and closed loop coolers have gotten better, and honestly no one can afford to spend $3000 to get 3° lower temps any more.

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6 points

I built a PC recently, and when researching it still seemed a large chunk went with water cooling still. AIO in particular.

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4 points

Only sort of, it still exists but it’s a lot more compact now. And not super common as far as I know, like the other poster said here air cooling has come a long way. I’ve got a water cooled GTX 1080 Ti in my rig right now, but it’s basically just a couple rubber tubes coming off the GPU leading to a little square radiator that I have a fan bolted to. It all sits inside the case (or, well, it’s intended to… My case isn’t quite large enough for everything I’ve got in it so I’ve got the radiator and fan a little bit jury-rigged to the front of my case right now. No biggie.)

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24 points

Probably for external radiotors. Outside of the case you can make them bigger and thus more silent.

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12 points

Radiators? Nah, open loop. One end to the faucet, other end to the drain. If you’re on well water it goes right back down to where it came from.

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22 points

I’ve always wanted to have to clean hardened calc/lime out of my CPU cooler!

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10 points

They’re also useful if you are doing weird stuff with your PC and you need to run a connector into or out of your pc

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9 points

Built a computer for a guy years ago. Dual titan X, 3 radiators in a little fucking HAF tower. He bought two exterior radiator mounts

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3 points

Was about to ask what one does with dual Titan Xs, but the obvious answer is whatever the hell one wants.

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5 points

Yeah SLI was still a thing at the time. From what I gathered he was trying for XOC records on liquid. He only came to us because he didn’t want to spend the time building it

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6 points

Years ago, I saw someone run a copper loop through this newly poured basement foundation just to use to cool his pc silently.

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3 points

If i could show you the amount of awful 5 gallon bucket, recycled tygon and aquarium equipment “water cooling” loops i used to use for shit, you’d probably piss your pants laughing.

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4 points

Found it.

Speaking off cooling and piss, I once saw a streamer experiment with cooling a pc with his piss. Well, I’m saying it was his piss. For ToS reasons, he made it clear he couldn’t say it was his piss. It was ill-conceived and he couldn’t get far enough to actually do a benchmark test.

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3 points

Yeah I remember that post on Reddit. Holy shit my mans literally ran like 1000ft of copper through his ceiling into his house’s plumbing lmao. He also had a WILD monitor setup, was more like a pit than a desk.

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1 point

Now that I’m home, I can find the post I’m remembering.

oh, no. It’s much older then reddit. It was an old Slashdot post from 2009.

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5 points

Ive used mine before because the rad was too big to fit internally.

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2 points

The rubber didn’t agree well on my old case. I poked it a couple years ago trying to figure it what it might be and the little triangles has gotten stiff and snapped off on one side, so I stopped poking it.

I was today years old when I learned what they were for though. I knew it was some kind of tube or pipe or hose, but I’ve spent about 0.3 seconds actually thinking about it so I never figured it out.

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2 points

I knew someone who had the MO-RA3 through those ports and had it on the other side of the room. He sold it to another person in the discord server we were in and he actually installed it in his basement directly below the computer on the floor above. Wild

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1 point

I used them on my old Build! Pretty neat if it got some light up the back, but I went back to air cooling, so I’ve got then holes of glory again.

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99 points

PCussy

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23 points

Compussy

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11 points

A fellow man of intelligence

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9 points

Do we already have c/dontputyourdickinthat?

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1 point

“It doesn’t know where you’ve been!”

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6 points

USBussy

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98 points

It is probably an old case design. In the early water cooling days, there would be separate watercooling units that sat outside the case. The grommets were so you could pass your tubing through.

I wouldn’t really worry about the dust tbh, you will wind up having to clean it regardless.

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21 points

This is it! Old water coolers

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8 points

Specifically, these are for being able to pass in the tubing when your computer overheats playing Counter-Strike 1.5 so you pull apart your 50cc moped so you can bolt the moped radiator to the side of the case since it doesn’t fit inside. At least that’s the only use I’ve actually seen in practice.

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13 points

Not just for water cooling. It’s for cables that pass in or out too.

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10 points
*

Such as?

Edit: I mean you can contrive something if you’re MacGyver but there’s no remotely standard use case for that.

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5 points

There were some old PCI cards that were very badly designed, and they required things plugged into them from inside the case, or they needed to plug into things on the motherboard. I had card that controlled Cold cathode tube lighting that could also connect to audio to sync to the music that worked that way

But, the actual answer is that the grommets are for old-school water-cooling.

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4 points

Such as sata cables for quickly hot plugging hard drives you are testing/inspecting/cataloguing and don’t want to open the whole case between each drive, or leave the case open.

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3 points

Anything that doesn’t have an external connector or some way to mount one. One example would be if you were using a USB Wi-Fi radio and wanted to connect it to the internal USB connectors but you’d need to pass the antenna to the outside of the case.

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2 points

Mine has an 3 position exrernal fan switch for manual control, cable comes out those holes. Also useful for direct header usb that you run an extender cable out to another device.

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1 point

Kvm

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1 point
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71 points

Hole for Pepnis

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21 points

Forbidden butthole

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3 points

It’s OK, you can write Pepsis on the internet

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3 points

I showed pepnis pls show bobs

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57 points

Rubber holes on the back of your PC case?

I just met the girl!

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19 points

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