Sorry for not doing the second part yesterday. Business dinner popped in and I couldn't do the post. But I plan to concentrate on fans, fan ducts and legs today after work. Before that, I'll try to answer the questions that came in after the first post.
what is the temperature difference between duct and no duct(using same fan)?
Since my fan is 130 CFM and original fan is 230CFM, the difference is about 15°C. I don't have written data of when I ran the first test. The problem are the temperature sensors. Thanks to having no duct, temperature sensors are highly affected by side airflow and read about ~5°C higher temperature, even though you can clearly feel the stronger heat radiating off the hash boards. Would not recommend using lower CFM fans without fan ducts. You will definitely shorten the lifetime of your miner and you won't be fully aware of how hot it is.
this is REALLY awesome work, and good for you for supplying these designs. I will print them out and test it on my S5 tomorrow. How did you attached the legs to the fan and fan to miner? I dont see a screw going in between them.
I'll get into this later today. The legs are designed so that they fit into Scythe's fan's gaps perfectly, you can also use screws that come with the fan to tighten them, but the miner is stable without that as well.
Out of curiosity what is time and cost to do this? It is very very nice.
Also can I ask what 3d printer do you use for this? And kudos for releasing designs that is above and beyond.
The cost is rather low if you're printing with ABS. Every part can be printed 80% hollow inside (20% infill). One duct is about 36g which equals about $1 of PLA in my case.
My 3D printer is Rostock Mini Pro. Just large enough to print a 120mm fan duct in it.
wow such a good looking miner..
how much temp difference using this mod?
Here are my stats after 7 hours of constant mining:
http://www.pohrani.com/f/1e/iW/1Jqovfj3/mine-black.jpghttp://www.pohrani.com/f/5/e5/4jz7lglA/miner-green.jpgThe new miner, which came with external heatsinks, has 5°C difference between hashboards. Still haven't found out why.
These are stats with only a push fan. Pull fan would lower temperatures by additional 5°C. I don't use it unless I'm looking at a really hot day or want to overclock miners to 425MHz.
Fantastic! Wondrous effort and very well done. I really I'm interested in the printed mods ..... and if possible an estimate as to cost.
With regard to the bottom cover, would a simple ridge at the intake end suffice rather than having the ridge all along the length of the cover? I assume that despite having underspecified the fans there is is still adequate air pressure to keep the stream flowing ....
I wonder what the result would be, hash wise & HW error-wise, to run the stock S5 fan, rather than your replacement ones (on original firmware) at an OC freq, say 412. I say this because I managed to drastically reduce the HW % out of an OC'ed S3 @freq 281, running a stock S5 fan in pull configuration at full pelt, aka no PWM. (PS. that also showed up my 550W PSU and had to switch to a 750W one!)
Thank you!
With my push-pull configuration I can run up to 450 MHz without overheating. But I noticed a drastic performance loss at 450 MHz. 425 seemed optimal. The reason why I wouldn't use stock fan is because it is louder than 4 Scythe Ultra Kaze fans. I think I have a way of demonstrating this.
When you see HW errors popping up in larger number, you can be certain you have some chips above 80°C.
Very nice work with the air ducting, I bet that's a huge difference. I have an S1 and S3, plan on getting an S5, and I've noticed how much cool air comes out the bottom of the S1, vs the enclosed design of the S3.
Any plans to sell the top and bottom pieces? I bet people would buy them.
Material-wise these are not a problem to make. But the print time of one on my printer is about 5 hours. Should there be enough interest nothing stops us from making bulk order from a company that does plastic products through molding. Both top and bottom ducts as well as top and bottom plates are easy to mold.
Excellent job, thanx! But it would be great if you design some stubs which will prevent air to blow away in all directions from the gaps between PCBs of the blades and plastic side panels. More directed airflow will make blades cooler. The bottom plate can be easily reworked for this purpose, it should be just about 20 mm wider from each long side, right?
Also for top and bottom plates - I believe you can put some voids in it to reduce the consumption of the material while the shape of the side faced to heatsinks will remain the same. Please sorry for my English.
I need 3d printer now... For free...
p.s. where is "Fan duct - Top.stl" on that photos? Is it for cooling S5 with 2 fans?
Yes, the bottom plate can be reworked to cover the gaps, top would be more difficult, but instead I made the bottom duct to direct the airflow and it is working good this way. Enough just to move the air around the external heatsinks, as internal heatsinks have much higher efficiency and air going out is just a waste.
The top fan duct is not there in the photos. I assembled the miners with one fan to make them less noisy. I'll put the second ducts up today and photograph it all. For now here are 2 photos of the prototype I dug out on my phone:
This was the first prototype I ever printed. It didn't exactly match the fan and had rather thick walls, but it perfectly "clicked" into the miner.
Here's what the miners look now, powered up and mining:
This is the power draw (350MHz):