SP20 more GHs?

[philipma1957]

Good to know.  I'm currently getting a tad under 1.3T with a 750W PSU which sounds normal and yes loops 1 and 3 do run hotter so I will try dropping the power and voltage to see if that helps with temps.  I do have a HP DPS 1200 that I want to use instead to give me a little headroom, I just need to get a breakout board for it.

Getting about 105 chip side @ 1.32T with these settings.  Thanks for the tips, as a new miner I find that people on this forum have been very helpful and patient.

Start Voltage 0.64 / 0.62 / 0.64 / 0.62
Max Watts 200 / 150 / 200 / 150

MY opinion is you have it in its sweet spot.
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this type of overheating to 120c is not the same as running the fan at 90% and the gear at 1600gh
You run the fan at 10%  and I know you clock lower then 1600gh
Op is sending a lot more juice into his sp20 then you do.
The temp checks are in a few places not all over.  Thus it is far more likely his gear will burn up then your gear will.




 

I run mine at 10% fan, the 2 rear(loop 1 & 3) 'sections' run quite a bit hot up to 120C consistently, the firmware reliably declocks / devolts the ASICs as needed to keep them at 120C or lower. Ran this way for months w/o issues.
My exhaust temp has gotten high as 80C

One thing Ive started doing on my SP20's is setting the rear 'sections' at a lower start voltage / lower power max to keep them running cooler. The front ones Ive set higher to make up for the speed loss. This helps even out the temperatures quite a bit, between the front n back sections.

[larry12]

guys you are crazy to run miners with 120C chip temps 
how long do u think your miner will handle with this push ? 

[GenTarkin]

I run mine at 10% fan, the 2 rear(loop 1 & 3) 'sections' run quite a bit hot up to 120C consistently, the firmware reliably declocks / devolts the ASICs as needed to keep them at 120C or lower. Ran this way for months w/o issues.
My exhaust temp has gotten high as 80C

One thing Ive started doing on my SP20's is setting the rear 'sections' at a lower start voltage / lower power max to keep them running cooler. The front ones Ive set higher to make up for the speed loss. This helps even out the temperatures quite a bit, between the front n back sections.

I would turn up the fan.  120C is still very very hot to run it over time. I would underclock some to get lower on those two loops.

What speed are you going for to get such high temperature?

They run anywhere between 1300-1450GH depending on the unit & the quality of chips. 2 of my SP20's do run the fan at 30%, those were my higher clocked ones.
I really need to keep the other 2 fans at 10% cuz they are in living quarters, anything above 10% makes it unbearable lol!

[alh]

It's interesting that on my one SP20, Loop #3 is the one that has a single "hot" chip on it. It is the same loop, that always exceeds it's power limit by a significant margin. The other 3 loops come in just short of their respective limits, but #3 is at 140W with a limit of 100W.

I have wondered if perhaps the one "hot" ASIC just needs some attention to it's heatsink and thermal paste. Since I am power limiting to about 600W total at the wall, everything runs just fine, and hence I don't really have a compelling reason to monkey with the hardware and risk serious damage.

Has anyone tried to tried to "fix" just one hot chip in their SP20?

[notlist3d]

It's interesting that on my one SP20, Loop #3 is the one that has a single "hot" chip on it. It is the same loop, that always exceeds it's power limit by a significant margin. The other 3 loops come in just short of their respective limits, but #3 is at 140W with a limit of 100W.

I have wondered if perhaps the one "hot" ASIC just needs some attention to it's heatsink and thermal paste. Since I am power limiting to about 600W total at the wall, everything runs just fine, and hence I don't really have a compelling reason to monkey with the hardware and risk serious damage.

Has anyone tried to tried to "fix" just one hot chip in their SP20?

I would guess most have not tried.  With SP gear if you open it you lose warranty.   So most never are even opened.

[GenTarkin]

It's interesting that on my one SP20, Loop #3 is the one that has a single "hot" chip on it. It is the same loop, that always exceeds it's power limit by a significant margin. The other 3 loops come in just short of their respective limits, but #3 is at 140W with a limit of 100W.

I have wondered if perhaps the one "hot" ASIC just needs some attention to it's heatsink and thermal paste. Since I am power limiting to about 600W total at the wall, everything runs just fine, and hence I don't really have a compelling reason to monkey with the hardware and risk serious damage.

Has anyone tried to tried to "fix" just one hot chip in their SP20?

One way to make it obey the power limit is to drop its starting voltage that way it will climb up to that power limit and not go over.

[alh]

Good idea on the Starting Voltage that I hadn't considered. I'll give it a try when I next decide to adjust the settings.

Thanks!!!