[Review 1] A Spondoolies-Tech Sp20 in Italy

[raskul]

i like the background stories, these are little snippets of people's lives that we very rarely get to read, it kinda puts a persona behind the usernames. thanks for sharing.

[spiccioli]

i like the background stories, these are little snippets of people's lives that we very rarely get to read, it kinda puts a persona behind the usernames. thanks for sharing.

My pleasure!

spiccioli

[spiccioli]

Yesterday I made a couple more tests after running it for a week at 1.5 Th and 1000W during the paycoin frenzy






First of all I did try to push it to the maximum, having a 1600 W PSU I though I could go higher than 1.7 Th, but alas I could not.

Intake temperature as reported by miner's interface is higher than environment's real one, I was in a 10 ° C as this old analog thermometer shows



but miner's reported temperature was at 16 ° C and increasing



At 1667 GH I was using around 1280 W on a 220V outlet with my Recom M1600 PSU (85% efficient)



1670 GH is as fast as it can go, in a 10 ° C environment, because of thermal throttling by the chips, which were not able to remain below 125C even at 100% fan speed.



In his review johnyj is doing some great mods to better cool all of the chips and so avoid thermal throttling, let's see what he can get.

spiccioli

[spiccioli]

So if I can't go faster, let's try to go cheaper

I've attached my unit to a Cooler Master V1000 PSU, 80+ gold and around 91% efficient at this load and I've limited chip voltages to 0.665 volts, without touching max watts per board, as per Spoondolies Tech recommendations.



And here what I can get, 1305 GH at 700 W, fan slowed down to 40% and chips nicely warm (intake at 22 because I'm back inside my mom's garage).





I'll leave it hashing at 0.536 J/GH for the time being, or at least until after Christmas time.

spiccioli

[bitcoinfansclub]

Hello would it be possible in your opinion to drive 2x SP20 with a 1200 gold PSU (100A)

In detail at 1000 GH and 500w each => circa 125watt per connector (1000watt/8)

1000watt over the 12volt rail equals to 1000watt/12v = 84 A < 100 A


what about it?

too much 125  watt for each 6 pin pci connector?

[mavericklm]

some of my test:

Mining Rate: 855.96Ghs
Temp Front / Back T,B    15 °C / 31,30 °C
Fan Speed    50
Start Voltage    0.6 / 0.6 / 0.6 / 0.6
Max Voltage    0.61
Wall wattage 425

Mining Rate: 770.07Ghs
Temp Front / Back T,B    14 °C / 29,28 °C
Fan Speed    40
Start Voltage    0.58 / 0.58 / 0.58 / 0.58
Max Voltage    0.6
Wall wattage 380


125w for each connector is more than fine!

thou i would do my best to push the miner to the max to recuperate the money invested....

[bitcoinfansclub]

Why didn't you try something more:

1029 Ghs @

T front/back: 20 /44
Start volt /max volt: 0.32/0.625
Max watt: 150

[mavericklm]

i think i did enough tests:
https://bitcointalk.org/index.php?topic=872014.msg10016431#msg10016431