Topic: [Review] Spondoolies SP20 review - A Green miner with a Loud fan (Read 21001 times)

The only limit I had in place was max. 250 Watt instead of 288 Watt. IIRC, 250 is offcial Molex spec limit, but Spondoolies were told 288 is ok by their supplier (this info I found in one of the threads, but don't have a link handy). Considering the temps at that location I went with the official spec.

Perhaps unsurprisingly, the top connector in the centre of the grille got the worst of it. Got to love basic physics!   Maybe to flip the unit so the connectors are on the bottom would be something to consider.

I have not flipped the fan yet, I just bought bunch of GT2150 fans from chinese online dealer and they provide better airflow than GT1850, at 50dB 1 meter away, not noisy at all when I'm sitting 7 meters away in another room

It is summer time and intake can go up to 30c degree, but the connectors are all quite cool in a pull fan configuration

Thanks for sharing this, Newar!

How hard were you pushing your SP20 in terms of voltage/power/fan settings?

I flipped my fan and eventually got melted connectors. Ambient temperature is pretty high at that location though.

U should flip the fan. Idk y most dont. Just make sure u dont over tighten the fan screws otherwise the blades might not spin. One of the 3 sp20's i have had the fan grill slightly bent inward...i couldnt tell that it was and still cant but once the fan was reattached after being flipped the blades didnt spin. I had to losen one screw more then the other 3 and it spun freely again. I boticed it when it powered on and didnt start with the fans at full speed for the first few seconds like it normally would not when it started mining so be sure to not assume they spin freely just spend the few seconds and spin it by hand to make sure before putting the top bracket and cover back on.

My pci connectors havent mented or discolored in ne way. I needed to run them with the fan flipped because i couldnt have the huge noise they generated when running in the original direction.

any news on that?

I think I'll need to flip the fans too.
What about the noise?

Interesting, I guess that will really help for the ASIC chips, since air direct blow on the heat sinks. The question is about the rest of the components, for example the PCI-E connectors, they will receive hot air blow out of the case, if they also have a high load, will they burn?

Currently I modified open case have all the ASICs running below 85c at 0.61V, 43db, but I found out that ASICs works better when they reach 100c, I can try this inverted fan setup when I have time

Ya im wonderin that myself cause he/she quoted me but if he did what i did to 3 miners so far he would have better numbers then that.

EDIT: oops didnt notice his voltage settings so his clock is higher then mine but the same questions still stand though.

Any mods?

Temp Front / Back T,B
27 °C / 78,74 °C
Fan Speed
40
Start Voltage
0.67 / 0.66 / 0.67 / 0.66
Max Voltage
0.71
Max Watts
288 / 288 / 288 / 288


 0: DC2DC/1/:[vlt1:724 vlt2:727(DCl:794 Tl:794 Ul:727) 102W 141A  67c] ASIC:[ 85c (125c) 1000hz(BL:1000) 14832 (E:193) F:0 L:0]
 1: DC2DC/1/:[vlt1:724 vlt2:727(DCl:794 Tl:794 Ul:727) 105W 144A  86c] ASIC:[ 85c (125c) 1020hz(BL:1020) 14906 (E:193) F:0 L:0]
LOOP[1] ON TO:0 (w:27661)
 2: DC2DC/1/:[vlt1:697 vlt2:701(DCl:794 Tl:701 Ul:727) 99W 141A 103c] ASIC:[120c (125c) 1010hz(BL:1010) 14426 (E:193) F:0 L:0]
 3: DC2DC/1/:[vlt1:677 vlt2:682(DCl:794 Tl:682 Ul:727) 91W 134A 103c] ASIC:[120c (125c) 950hz(BL: 950) 13235 (E:193) F:0 L:0]
LOOP[2] ON TO:0 (w:29846)
 4: DC2DC/1/:[vlt1:722 vlt2:727(DCl:794 Tl:794 Ul:727) 99W 136A  63c] ASIC:[ 85c (125c) 980hz(BL: 980) 14349 (E:192) F:0 L:0]
 5: DC2DC/1/:[vlt1:724 vlt2:727(DCl:794 Tl:794 Ul:727) 106W 146A  88c] ASIC:[100c (125c) 1040hz(BL:1040) 15497 (E:193) F:0 L:0]
LOOP[3] ON TO:0 (w:26576)
 6: DC2DC/1/:[vlt1:693 vlt2:698(DCl:794 Tl:698 Ul:727) 98W 141A  92c] ASIC:[120c (125c) 1000hz(BL:1000) 14330 (E:193) F:0 L:0]
 7: DC2DC/1/:[vlt1:646 vlt2:653(DCl:794 Tl:653 Ul:727) 70W 108A  85c] ASIC:[120c (125c) 840hz(BL: 840) 12246 (E:193) F:0 L:0]

[H:HW:1513Gh (500),DC-W:773,L:0,A:8,MMtmp:0 TMP:(27/27)=>=>=>(79/79 , 69/69)]
Pushed 10 jobs , in HW queue 4 jobs (sw:2, hw:2)!
min:59 wins:53412[this/last min:17/15] bist-fail:1758, hw-err:0
leading-zeroes:42 idle promils[s/m]:0/0, rate:1048gh/s asic-count:29392 (wins:8+9)
wall watts:1048
Fan:40, conseq:200

Ok so i read the posts in this thread and maybe i missed it but i didnt see ne one posting about doind something as simple as flipping the fan 180 degrees. The temps reported on the main status page showed:

Before = 66/58

After flipping the fan to blow air instead of pull air = 42/41

Asic temps all show 85 when before the first half were 85 and the second half were anywhere from 105-115. After the swap the very last asic in the chain hovers between 85 and 95 but thats acceptable. The other asics do not go up or down so im not sure what their temps are. Im thinkin 85 is the lowest it will go because when the miner first starts ik its not 85 degrees but the stats page say 85 on all the chips so idk what the temps are but they r either exactly at 85 degrees or lower. Thats seems like a pretty damn good decrease in temps that involves removing 4 screws and putting them back in....keep it simple peoples lol.

Also my settings are- .62/.62./.62/.62
                                .67
                                 180/180/180/180
                                  1322gh/s after running for about an hour.

For pulling air through the miners u need a sealed tube because any non sealed areas make the airflow into the miner less powerful. After removing the lid to flip the fan u will see a big gap between the fan and the top plate that the controller card mounts to which makes a bunch of air run over the top of the controller card instead of where its needed which is the asics itself. Some might worry that makes the controller vulnerable to overheatting but after flipping the fan theres so much more preasure in the miner that air hits all over the damn place which cools everything a hell of alot better. I was gonna turn my fans up to help cool the chips better but the flip made such a huge diff i dont need to raise them above 40 not at my current voltages. Hope this helps.

i have lot similar whit this fan
http://partner.delta-corp.com/Products/FANUploads/Specification/EFB1512HHG(REV01).pdf

my is delta EFB1512he dc 9-12 v 2,43 a  279 cfm
at 7-8 v is totaly silent.posible mount outside of sp-20 only need one screw adapter
https://www.dropbox.com/s/rzzt1tiso7q2cng/IMG_20150208_142317.jpg?dl=0
https://www.dropbox.com/s/645zt3ymqhltoe2/2015-02-08%2014.23.18.jpg?dl=0

https://www.dropbox.com/s/6ny7qfng9tcy71d/2015-02-08%2014.23.36.jpg?dl=0

https://www.dropbox.com/s/2wigeplb0hpj4wu/2015-02-08%2014.26.31.jpg?dl=0
https://www.dropbox.com/s/021nny00ow7yk87/2015-02-08%2014.27.27.jpg?dl=0

also have https://www.dropbox.com/s/3x1ad7gwuzqdifm/hladnjak.jpg?dl=0 full coper heatsink 0,6 kg    7-8 $
or use this https://www.dropbox.com/s/adm3904jfbrpo6t/hladnjak%202.jpg?dl=0  low profile 0,65 kg     8-9$
please all sugestion is welcome.
now i dont have time because i work in attic on cleean room whit military nuclear grade filter whit isolation rockwoll 20-30 cm
http://www.ebay.com/itm/NEW-ASTROCEL-I-1000CFM-CLEAN-ROOM-HEPA-FILTER-24X24X12/360960905857?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28808%26meid%3D1adc69b801a84b0a9d0b66c9a5cd9ba7%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D301492912443&rt=nc

also sugestion for hepa filter is welcome

China airmail arrived.
I can confirm these connectors do fit.
you only need to cut away some tiny outer plastic "noses" with a kitchen knife, then it plugs perfectly into the sp20 controller board.
then solder some standard 4-pin PWM connector at the cable and you can check every quieter 120mm PWM fan you like without losing warranty.

yeah just plug in 3 of the sockets and see what loop does not fire up.

Judging by the ASIC stats page the bottom two sockets. But for 100% certainty you should ask Zvi in the main thread. Or just test yourself by unplugging them

johnyj: thanks for the link.

my last test was: with http://www.noctua.at/main.php?show=productview&products_id=80&lng=en
works with limited CFM okay up to 1100 GH/s and when PWM below 50% it is really much quieter and my PSU is getting louder. I speak of round about 44db(a) from 1-2m distance. 44db are completely killed by shutting the door of a room.

Agree 100% with MrTeal.

Scythe/Nidec seem to be pretty close to published specs, I've had some good luck with those.

However, and this is a bit caveat.

No "quiet" fan, even an undervolted Delta is going to allow you to run at max speed on a SP20

To get to 1.6+TH you need 180+CFM and air moving at that speed needs a certain type of fan and both the fan and the movement of air produce a shitload of noise.

The target for me has been much quieter than the stock fan @40-50% at circa 1.4TH which is perfectly doable with something like a 130CFM Scythe

which one of those SLOTS labeled as 1,2,3,4 are the slots that power the back chips ?
Thank you !

In general, I completely ignore any specs published by manufacturers of computer fans other than size and RPM.
90CFM@1400RPM with 18dBA of noise? Sure buddy, whatever you say. When Delta (or Nidec, Comair Rotron, etc) publish a real datasheet, I generally will go by the numbers presented without questioning them too much. Computer fans, not so much. I'd be extremely hesitant to replace a 150CFM server/industrial fan like the AFB1212SHE (3700RPM/53dBA) or the 200CFM one in the SP20 with one marketed towards desktop users based on specs alone.

I found out that many users have their DC temp more than 70c degree and still hashing happily, so I decided to raise the temp by partly close the window of the room. As a result, the maximum achievable hash rate increased at 0.61V

Now 485W on wall, 1051GH ------> 0.46W/GH   See how long it lasts