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61
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Bitcoin / Mining / Re: Is a Bitcoin mining virus, more powerful than mining farms?
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on: June 09, 2015, 01:01:56 PM
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Since the malware writer would not have any expenses, any amount of Bitcoin or any cryptocurrency mined on that botnet would be profit. The electricity cost is zero for the attacker, and with some good social and software engineering, the virus could be spread very far. Also, the botnet of thousands of computers can still be rented out for blackhat purposes. It doesn't necessarily need to be dedicated to one thing, it could be multipurpose. This is kind of like this guy: https://www.reddit.com/r/IAmA/comments/sq7cy/iama_a_malware_coder_and_botnet_operator_ama/. He made malware which mined bitcoin, was also a banking trojan, and could ddos. Yes, but once he got them, but he will use them where he will get most profit out of them. Will mine those CPU mined coins or doing something else. Not that he will mine bitcoins, just because he can do it. Yes I would..... When I had FREE Power, I was running every laptop and desktop I could get my hands on even if it was a Kilohash miner.. infact at one point I had some 3Mhash Server blades running for me at a friends datacenter that were not being used at the time. |
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62
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 08, 2015, 05:47:28 PM
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Yes, open case. Going to try the Delta as push and stock as pull, but I think that will use more power than I wanted and will be louder than stock.
No idea, then Closed case will make them run coolest as that forces air where it needs to be What's the cheapest/easiest way to close the case up? Cardboard and Duct tape...... |
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63
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 08, 2015, 05:45:48 PM
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Yes, open case. Going to try the Delta as push and stock as pull, but I think that will use more power than I wanted and will be louder than stock.
No idea, then Closed case will make them run coolest as that forces air where it needs to be |
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64
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 08, 2015, 04:12:24 PM
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Push Pull? or stacked?
Just 1 delta as a push. It's specs were close to the stock fan, so I was hoping it would do the job. After about 1h of testing it doesn't look awful, however one S5 is overheating only on one side (the other one is proportionate). Not sure what could be causing it - the fans are identical and were installed exactly the same way. Can I see Pictures  I had to remove the black screws to get the Delta to fit flush. One unit running 60C/60C, the other 63C/55C, still not sure why it's uneven. The heatsinks got slightly bent while I was taking it in/out, but I got them almost back into the stock position. Not sure if the heatsinks would be causing such a temperature imbalance?  Running open case? |
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65
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 08, 2015, 04:11:22 PM
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anyone know the size screws needed for the stock fan? gonna add a pull fan to the back. wanted the same screws.
Just take 2 from the front to mount on the back |
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66
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 08, 2015, 03:01:07 PM
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Push Pull? or stacked?
Just 1 delta as a push. It's specs were close to the stock fan, so I was hoping it would do the job. After about 1h of testing it doesn't look awful, however one S5 is overheating only on one side (the other one is proportionate). Not sure what could be causing it - the fans are identical and were installed exactly the same way. Can I see Pictures |
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68
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 07, 2015, 02:14:49 PM
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Vorta, did you do any fan mods?@
Yes, I have (ended up doing this). 2x Scythe Ultra Kaze (push-pull) has proven to be the best in airflow vs. sound ratio. You'll also be able to overclock your miner. Push-pull combination will always work better than any push-only configuration on the S5 because of a lot of air escaping the heatsink before reaching it's end. I would recommend not buying Deltas as they are very loud. I would also not recommend overclocking the miner while using only one fan. Unless you have an infrared thermometer to monitor the temperatures of chips in the back of the miner ensuring they don't go over 90°C as you're testing the frequencies. Sounds as though BitMain should have put the thermostat at the back of the unit because those chips get so much hotter. or smartly... run the fan from the back to the front  |
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69
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 06, 2015, 01:44:33 PM
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Max be 239CFM That's very close to my Big boy deltas I use to cool my radiator for my OC i7 3930k~ 4.7ghz.....
Whats the Air Pressure? My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O
What do you mean by "1.412 IN H2O 35.877 mmH2O". I'm sure you make sense. It's just that I know the lingo. 1.412 Iches of H2O Or 35.877 milmeters H2O Often called a 'head' of water It is the pressure required to support a water column of the specified height. It is equivalent to 9.80665 Pa, using the equation: P = ρ·g·h/1000 or TL/DR how hard the air coming from that fan is pushing It refers to how much resistance the fan can overcome while moving x-amount of air. In our case, the resistance comes from pushing the air through the narrow passageways of the heatsinks. Another term for it would be back-pressure. The higher that resistance the harder the fans has to work to move air through it. Fans for miners or any other device with high-density fins on the power devices have to over come a substantial back-pressure to be able to move the required airflow through the heatsinks. By and large to produce high pressure a fan either A) has to be fairly thick to control how much air leaks between the fan blades and the housing. Is why most PC fans @ 25mm thick suck at producing any real pressure. Miner fans are generally >35mm thick. Or B) the other way to get the pressure is speed. Put the 2 together and yer Golden. You guys seem pretty knowledgable. How would 2 fans stacked together work? Twice as good, waste of a fan or total disaster? Fan stacking is more marketing hype than a viable cooling technique, don’t think you can get twice the airflow – if you’re lucky, MAYBE an additional 20%. When stacking two fans, the theoretical max airflow will be the same, but theoretical max pressure will double. From what people are saying about how small a performance increase they get, one could guess the airflow with just one fan is closer to max airflow than to max pressure. So stacking a fan doesn’t help much. Adding a fan in parallel would more likely help, but the airflow will far from double. This is because to double the airflow through an obstacle, one must also double the pressure (so actually 4 fans are needed). https://www.youtube.com/watch?v=VUbpb23yTK8Also you'de be better off setting the case to "push/pull like this out <*#s5#*< in That way the air in and out is balanced and they are not fighting or creating areas of high or low pressure... The biggest loss in the airflow game is unbalanced airflow in & out of the case. If you put in too much air you create a high pressure zone in your case and the fan has to fight this pressure to get the air across the fins. This is why sealing the top of the case result in lower temps. I personally helped a friend using Duct tape and Plasticard build a "lid" for his S5.. it dropped for him over all 2 degrees but that was with a single fan and not the push pull as described. More important for him it made for a Quieter over all system. |
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70
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 05, 2015, 09:25:03 PM
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Max be 239CFM That's very close to my Big boy deltas I use to cool my radiator for my OC i7 3930k~ 4.7ghz.....
Whats the Air Pressure? My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O
What do you mean by "1.412 IN H2O 35.877 mmH2O". I'm sure you make sense. It's just that I know the lingo. 1.412 Iches of H2O Or 35.877 milmeters H2O Often called a 'head' of water It is the pressure required to support a water column of the specified height. It is equivalent to 9.80665 Pa, using the equation: P = ρ·g·h/1000 or TL/DR how hard the air coming from that fan is pushing |
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71
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 05, 2015, 08:10:58 PM
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Get a Delta 35.877 mmH2O vs 16.9MM-H2O :p the key in the weay we use these fans is really is the MM-H20 over the CFM.... but then again who cares as long as the machine doesn't over heat
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73
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 05, 2015, 04:41:14 PM
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From a previous discussion, this was said to be the stock fan specs: Dimension: 120*120*38mm Voltage: 12V Start voltage: ≧8V (Power ON/OFF) Power consumption: 1600RPM 1.68W / 4000RPM 25.8W Rated current: DutyCycle 100% @ 2.15A Air Flow: 4000RPM @ 178.3CFM (Max be 239CFM) Noise: 4000RPM @ 56.7 dB-A (Measured in a Non-EchoChamber) Life Expectancy: 40,000 hrs @ 25℃ (May degrade faster at higher temperature) Connector: 2510-4P Also, I recently tried a dual 60CFM fan setup (one for push, one for pull), but it was clearly not powerful enough - temps were at 70C within a few minutes. This is what I used: http://www.newegg.com/Product/Product.aspx?Item=N82E16835553008I just ordered the following Delta and am hoping I can use it alone for just push: Delta Electronics AFB1212SHE 120x120x38mm Cooling Fan, 151.85 CFM, 58 dBA, 3700 RPM, 1.06 AMP, PWM 4-pin connector. I have the miners running in a temp controlled room with proper ventilation, which helps the temp's, but I'm still worried if the Delta might not be enough as 2x 60CFM was clearly not even close. @amelen That is a great find! Thank you. Please let me know what the results are!!!! Here's the fan on Amazon http://www.amazon.com/gp/product/B004Y1HLA8/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004Y1HLA8&linkCode=as2&tag=120mm-fans-20&linkId=5HKYNDGQB3P4D62Z That's very close to my Big boy deltas I use to cool my radiator for my OC i7 3930k~ 4.7ghz..... Whats the Air Pressure? My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O |
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74
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 05, 2015, 02:55:13 PM
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Hello
I have this fans
Silverstone Tek 140mm x 38mm Fan for CPU Cooler and Computer Cases Cooling FHP-141
but Antminer on 350 mhz have the 75-78C temeperature
More overclocking is impossible
but the sound is much less
but the room quickly heated as the air coming out is much hotter
I believe the one that comes with S5 is around 4000 RPM. That fan appears to be around 2000 RPM. It's essentially cutting your cooling from fan in half. If your wanting to do less on fan you really need to do a push/pull combo. I would recommend putting on original fan till you get another of other to test push/pull. 78C is just getting pretty hot. And pushing it pretty hard. NO Sir NOT AT ALL, IT DEPENDS ON BLAE PITCH... A 200RPM fan could be moving MORE air based on the blade pitch.... Please don't spout off about things you have no clue about. I thought for sure that somebody would know the make/model of the OEM fan. Sounds like it is a variable speed 4,000 RPM 120mm fan but without the specifics I'm not sure if a replacement is good/better/worse.
UNLESS This is the fan: http://www.amazon.com/Koolance-FAN-12038HBK-184-Fan-120x38mm-184CFM/dp/B0050UP8HKThen we are talking ~180CFM.... but these would make the S5 as loud as a room full of people talking (As loud as an S4/S4+) Can you get me any information Off the Physical fan? I know its a 12038 |
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75
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Bitcoin / Hardware / Re: Bitmain S5 Replacement Fan
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on: June 04, 2015, 07:06:53 PM
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Thank you kindly for the information but I am looking for specifics. Current Model, Current Model CFM, Where to Purchase Current Model.
Everything that I have seen about replacing the with a different model has lead to higher temperatures. Is this the case or have I been reading the wrong posts?
TFC1212DE Needs an external Power and can't come off that riser on the control board as its a 4amp fan... but it also pushes 255Cubic Feet/Min |
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76
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Bitcoin / Mining / Re: Is a Bitcoin mining virus, more powerful than mining farms?
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on: June 04, 2015, 04:31:58 PM
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No.
There was a time when mining viruses were abound in the days of CPU and GPU mining. But ASICs are by magnitude more powerful than CPU or GPU, it would take an army of 10s of thousands of PCs to even begin to touch what a single ASIC machine can do. People complained about ASICs but one thing they did do was totally eliminate these viruses because they were no longer very effective. Those kinds of viruses went off to hunt other coins that are still CPU or GPU driven.
Who Cares? its FREE Money to the hacker |
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78
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Bitcoin / Hardware / Re: ANTMINER S5: 1155GH(+OverClock Potential), In Stock $0.319/GH & 0.51W/GH
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on: June 02, 2015, 05:58:42 PM
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While I expect this won't be popular, you can try "down clocking" your S5 to reduce it's power consumption, and therefore it's heat production. My thinking is that in the summer I'll down-clock my SP20, and push it up more in the winter, when the heat is useful. Adjust according to you locale.
Of course if you live near the equator, this advice is semi-worthless.
i thought of this too. 3 days ago it was 86 out where i live. the garage was HOT! had to underclock them a lot. Then the last 2 days have been mid to high 50's, these things are loving it. Does anyone know how low we can run these temperature wise? if i keep them in my garage this winter the temp goes to 0 degrees some days in January. anyone run these in that cold of temps? I ran my C1 @ -5c outside (radiator) and the heat was enough to keep it from freezing, it stayed at 7c for most of the winter and didn't care...... I was a LITTLE worried about condensation... but It didn't kill anything...... I plan to heat my crawl space with 2 S4+s this winter and leave my vents open all winter on the back side of the house....... I also know a guy who ran his FPGAs in his insulated Garage in Novia Scotia for the winter of 2012/13 and was happy.... REMEBER COLDER DOES NOT MEAN FASTER... COLDER MEANS MORE Headroom to OC.... AGAIN COLDER EVEN KEEPING THEM AT -100C will not make the chips run faster, it just means you can pump more Power I to it, or you can clock it faster. |
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79
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Bitcoin / Hardware / Re: ANTMINER S4+ Discussion and Support Thread
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on: June 02, 2015, 02:09:57 PM
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It is my datacenter, I know that it is in a room where nobody has access.  I was on bitminter and kano with the devices. Check your Logs, see where the change came from, also update your passwords. From what I understand its a flaw in the bitmain system. And people could just be scanning for devices. Its not hard to scan a full subnet for a device that reports it's self as Antminer, then launch a relatively non-sophisticated attack. |
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