Mining Rig Cooling Solution (22 GPUs)
The tent rules. Period. The ability to blow in cool air (from outside) and blow out the hot air (back outside) keeps the tent at a nice avg of 77 F and the room is also very comfortable. It does it’s job, and I love it. That room (pre-tent) was about 87 F and no one wanted to be in it for any length of time. Now it’s great.
Wow, people get excited about the A/C in the video. They jump to conclusions and think I bought the A/C for the mining rig. Truth is, the AC has been in this room for years. But before YOU jump to conclusions (if you are reading this) then just know that I could care less if the thing is going to cost me a few extra bucks a month to run. SO far, I have used the AC less than 1% of the total time I have had the rigs. Since last October, total AC usage is 54kW. That’s $5.40 over 6 months. I’m ok with 10X that in the summer if it means my GPU’s are not burning up. (10 x 5.40 / 2) = 27 / 3 months = $9 per month.
If I lose just one GPU from over running it, that would be much worse. I like cool running electronics. These GPUs were not meant to sit in 95 + degree heat, running at 90 C with the fans on 100% for 24 hours per day. People will say, “all you need is air circulating” and that’s great for them. But, I’m used to things going wrong, so if I have to use a little AC for peace of mind, I will.
Video: Hey everybody, Steve here and today I want to talk about mining re-cooling and for the longest time I’ve basically had my rigs just kind of out in the open in the room here. It gets really hot in the room and it’s really really loud so I was looking for a solution online. So, anyhow a guy on YouTube by the name of “angry chicken” gets all the credit for this idea. What “angry chicken” enlighten me about was the use of a hydroponic tent to put the rigs in. It’s really helped me get everything up from out in the open using this kind of set up to basically going in the tent and essentially I want to take you kind on a little tour, I basically did what “angry chicken” did and I just kind of made it work for my specific application and I’m going to go ahead and show you that.
Let’s go ahead and start with the exhaust. These hydroponic tents allow…. they have these big holes in them so you can put these 8-inch ducks in them and obviously the heat rises so this duck right here is actually sucking, it’s pulling heat out. And I’ll show you to kind of see where it’s going there it’s going down and around and I’m going to pick it up on the other side. All right so all I did was come around the front here and that is the heat one, let me go and pull out so you can see a little bit more, the heat one runs down and it goes into this in line fan right here which I’ll list the description for and it continues on this way and then it loops back around and then it goes back that way, picking it back up right here it comes and it’s blowing all that heat out the window.
So, essentially what I did was I cut a piece of board the size, cut an 8-inch hole in it and I actually have the fitting that I used. So, this is the fitting that I used and essentially put the duct over this part right here and it’s snugs up against the piece of wood right here and then what you do with these guys on the other side of the piece of wood is you can flap them out like that so it stays in place. Once you flap them all out you’ve got a flat surface on the other side as well. So, that’s the heat side and I’ll show you the inside in a second. But let me show you the cold side.
Ok, so for the cold side I’ve got another one of those fans and essentially what that’s doing is it’s pulling the cold air and it’s pumping it into the tent down at the bottom. so, cold air in the bottom, hot air out at the top.
Ok, so, I’m pulling cold air from 2 sources. When it’s cold enough outside I’m pulling it from outside and there’s a filter on the end of that to cut down on the amount of bad stuff that’s coming in and essentially that comes in and it continues on and down that line right there and it ends up inside the tent. Now summer is right around the corner and I haven’t had to use this very much but I also have it branching off and going in to a portable AC unit. Now this AC unit right now is just blowing a fan, it is not using air conditioning. When it’s running as a fan it runs out about 54W, when it runs as an air conditioner it bumps up to about 1000W, so obviously I want to cut down on as much usage of air conditioning as I possibly can. And for the most part through the winter I haven’t had to use this thing at all, it’s an abnormally warm winter right now it’s actually already around 70 degrees outside so I’m supplementing that air with some air here.
And here’s the cool thing is look at the temp in here, the temp in here is nice comfortable 73 degrees and that’s even with this guy blazing away. So, once I get this guy inside the tent I won’t have the excess heat from him and the reason why he’s not in the tent yet is because I’m having troubles with the Gigabyte B250 board that’s supposed to handle up to 12 GPUs but I have yet to be able to get more than 6 to run on it, as you put 7 on it it arrows out and I haven’t been able to find a solution online yet so I’m still troubleshooting this one but it will end up in its home inside the tent. So, let’s go ahead and see inside the tent.
All right so the tent it’s got 16 GPUs in it right now. It’s at a nice 77 degrees with 37% humidity and this is essentially what I’ve got here. So, in here I’m running 2 stacks of 8 AMD RX580 and let me show you what the cooling setup is. So, here’s the cooling duct coming in and essentially it comes across and it’s blowing quite strongly right here and that’s nice cool air right there but the other thing that I did was I cut a couple slits in it to even out where the air is coming from and this is got a big gaping hole in it right here so that this fan can blow air across the front. You can see that with the big hole that fan is pushing cold air across the front of everything and then I’ve got this other fan here to help just move as much air as possible and then I’ve got a bonus fan right here. So, that’s basically the cooling side and then here’s the big sucker right there all the way at the top. It is very strongly sucking all the heat out of this thing. So, there’s the hot side right there and coming down the cool side right here.
So, as it is right now this cooling system is doing a great job, the GPU fans are all working at around 50% and their temperature is staying the hottest one is running around 70o Celsius and the rest of them are running actually in the 60os and some of them in the 50os. My whole goal is to not have them working very hard. The vast majority of these GPUs in here are BIOS modded, so they’re running 28, 29. I’ve got a couple that I haven’t done yet on this rack that are running probably 26.7, 27.5.
Another thing I love about the tent is it’s got a side door so I have really easy access to get to my boards if I need to go in there and do any maintenance or whatever. So, here’s more of a pulled out shot of the side.
The fans do not come with these cool dials that allow you to adjust fan speed to your liking these are extra. If you notice the tent bowing inwards I have negative pressure in the tent which means it’s drawing out more air than it’s bringing in. My goal is to basically just extract as much of that heat out as I possibly can. So, you know when I get this guy in there that’s going to really make a difference, the temperature of this room this room is pretty comfortable now, it’s a tick on the hot side but as soon as I get him in there this room will be nice and comfortable and the tent will be nice and comfortable. And the other thing is that I can say that it’s quiet but I can say that it’s significantly quieter than it was when I had everything out in the open. This is a decibel meter in the room, 73. At one point you might have seen it in a previous video I had without the ducting on the fans I had one foot in pushing air out and one fan pulling air in and the decibel level in here was actually over 100, it sounded like a damn jet airplane so that’s where I’m coming from when I’m saying that it’s relatively quiet.
The other thing is that when I lay some egg crate material over the fans it actually makes it a little bit quieter. So, I might come up with a more permanent solution for this but yeah.
So fortunately, I haven’t had to use the AC much at all obviously when I put the third rig in there and it gets to be summer time I’m going to have to use it. So, I know there’s a lot of people out there that boohoo the idea of using an air conditioner, my goal is simply to get my GPUs to run for as long as humanly possible. I’d rather under work my GPUs and spend a little bit more money on electricity, these things run under the thousand watts so what is a thousand…. if it were running 24 hours a day at 10 cents that would be $2.40 a day. The good news is that it doesn’t have to run 24/7, I can actually just engage the thermostat have a go back and forth between air conditioning and thermostat so it’ll be essentially going back and forth and back and forth monitoring the temperature which means I could probably get my cost down to half of that so $1.20. So, everybody has their own opinions my personal opinion is at the expense of some extra air conditioning I’d rather have my GPUs not being overtaxed 24/7, I’d like to get as much as I possibly can out of these guys so if that means I’m spending an extra buck and a half a day on an electricity to keep these guys going for much longer that’s fine.
So, anyhow I’m Steve and this is my cooling set up for my currently 22 GPUs and soon as I figure out this board I’ll tack on a couple more and I’ll put them all in a tent I’ll do a follow up video but mad props to “angry chicken.” Thank you so much for the idea, it’s ingenious and if you want to nice comfortable mining room this is definitely the way to go. So, anyhow I’m Steve signing off till the next video, please like, subscribe, comment and I’ll see in the next one, later.