dmwardjr
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Technical Analyst/Trader
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April 02, 2015, 10:39:08 PM
Last edit: April 02, 2015, 10:52:02 PM by dmwardjr |
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What's the minimum per fan CFM on a 2x fan setup?
I'm able to run at a frequency of 250M hashing almost 800GH/s with two old PSU fans. These fans can't be more than 20 CFM each. This thing seems stable just below 50 deg.
If you want to run it at default freq (350) you need minimum 200 cfm in my opinion. Something like 2 120 cfm fan using a push pull setup should work. Be sure to be below 60 on each blade. Why not use only one 256 CFM fan @ 5,500 RPM's that I suggested earlier? I see [now] I need to go ahead and shut down an S5 to take the time to replace the stock fan with the one I mentioned and post pics of the ambient temperature on my thermometer; as well as screen shot of miner stats. |
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notbatman
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April 03, 2015, 12:11:51 AM |
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What's the minimum per fan CFM on a 2x fan setup?
I'm able to run at a frequency of 250M hashing almost 800GH/s with two old PSU fans. These fans can't be more than 20 CFM each. This thing seems stable just below 50 deg.
If you want to run it at default freq (350) you need minimum 200 cfm in my opinion. Something like 2 120 cfm fan using a push pull setup should work. Be sure to be below 60 on each blade. Why not use only one 256 CFM fan @ 5,500 RPM's that I suggested earlier? I see [now] I need to go ahead and shut down an S5 to take the time to replace the stock fan with the one I mentioned and post pics of the ambient temperature on my thermometer; as well as screen shot of miner stats. Fan speed gives a competitive edge as a banshee screeching contestant and at 5,500 RPM she looks like a winner. |
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notbatman
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April 03, 2015, 12:55:13 AM |
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After speaking with an expert the following fans are in stock: "NF-P12 PWM" $19.09 USD each. http://www.noctua.at/main.php?show=productview&products_id=43&lng=enAt 70 CFM each two of these should work to keep it under 50 deg at stock frequency (350M) or higher. $38.18 total. I've also come up with two budget options: Dual Cooler Master: "Cooler Master Blade Master 120 Black 120mm PWM Case Fan 600-2000RPM 21.2-76.8CFM / R4-BMBS-20PK-R0" $11.91 USD each. $23.82 total. Cooler Master / Arctic Cooling combo: "Arctic Cooling Arctic F12 Pro PWM 120mm Fan 400-1500RPM 57CFM FDB / AFACO-12PP0-GBA01" $4.77 USD each (can only push air due to design limitations). $16.68 total. |
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zaugger
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April 03, 2015, 04:12:50 AM |
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I see that you guys have the "newer" heatsink. I was given the heatsink similar to the S3s.
Interesting, this is the 1st time ive seen that heatsink. i have 4 s5's with the older style. Has anyone compared the temp at higher clockrates with the new heatsink?? Thanks |
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HolgerDansk
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April 03, 2015, 04:24:13 AM |
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Please wait for the official announcement
Could you please tell us when you plan to make an announcement about new miners and when you plan to announce upgrade kits? |
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aarons6
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April 03, 2015, 04:25:18 AM |
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Please wait for the official announcement
Could you please tell us when you plan to make an announcement about new miners and when you plan to announce upgrade kits? i bet probably not before june.. they woudlnt want people to wait and not buy their last batch of s5s. |
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Darthswan
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April 03, 2015, 04:41:02 AM |
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I see that you guys have the "newer" heatsink. I was given the heatsink similar to the S3s.
Interesting, this is the 1st time ive seen that heatsink. i have 4 s5's with the older style. Has anyone compared the temp at higher clockrates with the new heatsink?? Thanks I have a new one. Here are some stats.   Here are some of the stats. |
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aarons6
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April 03, 2015, 04:59:47 AM |
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I see that you guys have the "newer" heatsink. I was given the heatsink similar to the S3s.
Interesting, this is the 1st time ive seen that heatsink. i have 4 s5's with the older style. Has anyone compared the temp at higher clockrates with the new heatsink?? Thanks I have a new one. Here are some stats. Here are some of the stats. mine has the s3 style heatsinks.. here is my temp  |
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Rabinovitch
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A humble Siberian miner
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April 03, 2015, 05:25:48 AM |
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Damn... Shipping cost for 1 S5 (to Russia) via EMS became 129.613 USD. Who is crazy - Bitmain or EMS?.......  |
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dmwardjr
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Technical Analyst/Trader
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April 03, 2015, 05:58:41 AM |
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Damn... Shipping cost for 1 S5 (to Russia) via EMS became 129.613 USD. Who is crazy - Bitmain or EMS?....... Puton, wants his cut in customs since the economy is in the sinker. |
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chiguireitor
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Coins, Games & Miners
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April 03, 2015, 08:38:26 AM |
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[...] Puton [...]
Dunno if funky typo or hispanic joking about Putin  |
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Unacceptable
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Activity: 2212
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April 03, 2015, 09:10:08 AM |
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[...] Puton [...]
Dunno if funky typo or hispanic joking about Putin Well,he could have called him "puta"  |
"If you run into an asshole in the morning, you ran into an asshole. If you run into assholes all day long, you are the asshole." -Raylan Givens Got GOXXED ?? https://www.youtube.com/watch?v=9KiqRpPiJAU&feature=youtu.be"An ASIC being late is perfectly normal, predictable, and legal..."Hashfast & BFL slogan  |
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Rabinovitch
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A humble Siberian miner
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April 03, 2015, 09:50:30 AM |
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Guys, please stop this off-top.
Moreover, it's a bit stupid kind of jokes.
p.s. I am not Putin's fan at all, but...
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Subw
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April 03, 2015, 10:10:14 AM |
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Damn... Shipping cost for 1 S5 (to Russia) via EMS became 129.613 USD. Who is crazy - Bitmain or EMS?....... Due to the large quantity of shipments abroad, customs request us to do official customs clearance before exporting. Current shipping cost provided in our website has included the handling fee charged by EMS.
Thanks for your understanding. |
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pekatete
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April 03, 2015, 10:37:32 AM |
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Damn... Shipping cost for 1 S5 (to Russia) via EMS became 129.613 USD. Who is crazy - Bitmain or EMS?....... Due to the large quantity of shipments abroad, customs request us to do official customs clearance before exporting. Current shipping cost provided in our website has included the handling fee charged by EMS.
Thanks for your understanding. That would be nice if they include the VAT / import duty payments and the courier charges in the shipping cost to the UK, so all we are left with is signing for the item on delivery. PS. Where did you see that quotation? |
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TrevorS
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April 03, 2015, 12:22:16 PM
Last edit: April 04, 2015, 11:47:10 AM by TrevorS |
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The S5 are running great and so I've moved them to CGminer 4.90 and 312.5MHz. The highest reported temp is 57C with an S3 push fan and no pull (ambient ~72F, fan rpm 3240). Am intending to try the FHP141 as a pull.
My final two S5 shipped Friday and would have arrived Monday, but somehow, the UPS driver screwed up the delivery and a different driver completed Tuesday -- bummer on the whole day delay, lost some good WestHash payout  !!! Have received two each by USPS EMS, Fedex, UPS, and all would have been "two day" delivery (excluding Sunday and the UPS SNAFU), lowest shipping cost was EMS via DHgate back in January. The latest two (with S3 push fans) are setup side by side on the floor of my coolest room running 312.5MHz and temps 47/42 and 43/40 (top temp was 59 Vs 52 at 350MHz over a 2-1/2 hr check out). That first consistently runs by far the highest temp and fan speed of my three pair and makes me consider the heat sink paste mod described earlier** (currently 2760 Vs 2160 rpm) -- it also had pre-damaged Phillips head screws by whatever gorilla installed and warped the plastic side panels (since loosened). Am expecting to give Silverstone FHP141 pull fans a try this coming weekend. Thanks again Bitmain for the timely ordering assistance (Janet/Tim) and quick turnaround of the order -- here's looking forward to learning about the next generation! **https://asktom.cf/index.php?topic=902305.msg10926267#msg10926267 Three Silverstone FHP141 fans arrived Thursday and I took before and after temp and fan readings. The temp reduction I'm seeing on three S5 (w/ S3 push fans) is only on the order of 1C at 312.5MHz, but may be more noticeable at 350. Will look at that more when the next batch of three fans arrive. Between 312.5 and 350MHz, both fans appear to pick up roughly 120rpm, approximate norm being 3240/1560 -- current 350MHz temps being 56/54 and 54/53, aprox ambient measuring 72F(22.2C) a couple feet from the miner intakes. My max temp reduction results from running the same fan (S3) for both push and pull, but that hugely increases the noise. S3 push only gives just the sound of blowing air, adding the FHP141 reduces the air noise, but adds a distinct hum. I got the following stable results @312.5MHz (one individual S5): test case temp fan
S3 push only 58/52 3240
plus FHP141 57/55 3240/1680
S3 push/pull 54/53 3000/2880
Subjectively, the quietest case is the S3/FHP141 combo, the by far loudest is the S3/S3 combo, though the stock S5 is easily louder yet. I'd say the S3 push only works pretty well (depending on clock and ambient temp) and the FHP141 may be worth trying, but there is some hum. PS -- Appears the Silverstone FHP141 is indeed a PWM fan, wasn't at all clear to me from the manufacturer's description. |
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zaugger
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April 03, 2015, 02:13:39 PM |
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So it looks like the newer heat sink is less efficient at dissipating heat? It looks like the newer version has less/thicker fins.. I hate the quality of the s3 style fins, But hey they seem to work great, I wish a company made a copper option with heatpipes, could make a huge difference for overclocking. |
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pekatete
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April 03, 2015, 02:33:24 PM |
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.... I wish a company made a copper option with heatpipes, could make a huge difference for overclocking.
Should not be that hard to fabricate on your own .... just need to find out what thickness of the copper slab to get, slice some slots / channels in it and then split a few copper tubes to for the fins that are slid into the slots. All you are left to do is drilling tapped holes for attaching the PCB. I wonder how cost efficient it would be though for just a handful of units ..... ? |
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thedreamer
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Activity: 1694
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Go Big or Go Home.....
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April 03, 2015, 02:50:16 PM |
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.... I wish a company made a copper option with heatpipes, could make a huge difference for overclocking.
Should not be that hard to fabricate on your own .... just need to find out what thickness of the copper slab to get, slice some slots / channels in it and then split a few copper tubes to for the fins that are slid into the slots. All you are left to do is drilling tapped holes for attaching the PCB. I wonder how cost efficient it would be though for just a handful of units ..... ? Doesn't sound that easy to me. Unless you have a machine shop and all the tools necessary as well as the skills to do properly.  |
Go Big or Go Home.
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