[Review] Spondoolies SP20 review - A Green miner with a Loud fan - page 8.

johnyj

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Beyond Imagination

Quote from: Biffa on December 18, 2014, 11:20:06 AM

Quote from: johnyj on December 18, 2014, 10:41:22 AM

Quote from: Biffa on December 18, 2014, 04:27:43 AM

To test different fans this is what I did:

That's a nice idea! Grin

You can even install a fan speed regulator outside the case

Have you tried GT1850 with the SP20 set to 0.6v?

Yes, they just don't push enough air.

I've tried the GT1850 and up to the 4250

Ok. I think the previous king of cfm/noise ratio delta AFB1212VHE can be applied for under clocked SP20, but the noise could not be much lower. I have a feeling that the noise is coming from the resonance of the box, the fan itself should not sound that much

Syke

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Quote from: johnyj on December 18, 2014, 02:10:13 PM

The size of Rockerbox chip is the same as GPU, and it is 28nm! Modern GPU typically employ a large heatpiped heat sink with lots of fins for silent operation, but that is aiming for at least 5 years life expectancy. When there are 4 such GPUs on one single board, no simple cooling solution except lots of air flow can dissipate those heat

It's more the layout that's the problem. The airflow passes over 1 chip and goes +40c, then it passes over the other chip and goes another +40c. The second chip is baked by the first chip.

johnyj

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Beyond Imagination

Quote from: Guy Corem on December 18, 2014, 11:19:25 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

Agreed, the components are all of very high quality, very well designed and balanced, even the web page feels it is done by a professional design and integration team, just like branded: Carrier grade

Noise is not a big issue in mining farms. Especially when you are facing tough hashing war and your machine might be trashed after one year of operation

The size of Rockerbox chip is the same as GPU, and it is 28nm! Modern GPU typically employ a large heatpiped heat sink with lots of fins for silent operation, but that is aiming for at least 5 years life expectancy. When there are 4 such GPUs on one single board, no simple cooling solution except lots of air flow can dissipate those heat

Biodom

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Quote from: Guy Corem on December 18, 2014, 11:28:56 AM

Quote from: wpgdeez on December 18, 2014, 11:22:19 AM

Quote from: Guy Corem on December 18, 2014, 11:19:25 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

So why use crappy thermal paste and old inefficient heat sinks?

Both "facts" are untrue. Sure more expensive cooling stuff available. The solution we choose is adequate. It's certainly not cheap or crappy.
You can pour liquid nitrogen on this ASICs and probably get to over 2 THs, but the build cost will be over 0.6 $/GHs
Should we do it ?

Announcing "Frosénn"-a new 2TH (and more!) miner from SPT Grin

wh00per

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Quote from: Guy Corem on December 18, 2014, 11:28:56 AM

Quote from: wpgdeez on December 18, 2014, 11:22:19 AM

Quote from: Guy Corem on December 18, 2014, 11:19:25 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

So why use crappy thermal paste and old inefficient heat sinks?

Both "facts" are untrue. Sure more expensive cooling stuff available. The solution we choose is adequate. It's certainly not cheap or crappy.
You can pour liquid nitrogen on this ASICs and probably get to over 2 THs, but the build cost will be over 0.6 $/GHs
Should we do it ?

Let him do it! BOC and AirLiquide can deliver Liquid Nitrogen to his house for cryogenic tests. The temperatures will be a little low though .. Canada is full of surprises during winter Grin

Guy Corem

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Activity: 1414

Merit: 1051

Spondoolies, Beam & DAGlabs

Quote from: wpgdeez on December 18, 2014, 11:22:19 AM

Quote from: Guy Corem on December 18, 2014, 11:19:25 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

So why use crappy thermal paste and old inefficient heat sinks?

Both "facts" are untrue. Sure more expensive cooling stuff available. The solution we choose is adequate. It's certainly not cheap or crappy.
You can pour liquid nitrogen on this ASICs and probably get to over 2 THs, but the build cost will be over 0.6 $/GHs
Should we do it ?

Biffa

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Activity: 3234

Merit: 1221

Quote from: wpgdeez on December 18, 2014, 11:24:12 AM

Quote from: wh00per on December 18, 2014, 11:22:32 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

Not exactly .. I can see this a lot in most industrial setups, where you do not need all the bells and whistles for the consumer market.

They market it as a 1.7 thash home miner not industrial.

The "home" doesn't necessarily mean the bedroom or den.

TheNabeel

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Activity: 100

Merit: 10

Nice pictures , Noice is the only reason i dont buy sp20 , if someone successfully hacked the fan noice please do share

wpgdeez

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Activity: 728

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Quote from: wh00per on December 18, 2014, 11:22:32 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

Not exactly .. I can see this a lot in most industrial setups, where you do not need all the bells and whistles for the consumer market.

They market it as a 1.7 thash home miner not industrial.

wh00per

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Activity: 572

Merit: 500

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

Not exactly .. I can see this a lot in most industrial setups, where you do not need all the bells and whistles for the consumer market. This thing is supposed to run somewhere outside of the living spaces.

wpgdeez

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Activity: 728

Merit: 500

Quote from: Guy Corem on December 18, 2014, 11:19:25 AM

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

So why use crappy thermal paste and old inefficient heat sinks?

Biffa

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Activity: 3234

Merit: 1221

Quote from: johnyj on December 18, 2014, 10:41:22 AM

Quote from: Biffa on December 18, 2014, 04:27:43 AM

To test different fans this is what I did:

That's a nice idea! Grin

You can even install a fan speed regulator outside the case

Have you tried GT1850 with the SP20 set to 0.6v?

Yes, they just don't push enough air.

I've tried the GT1850 and up to the 4250

Guy Corem

donator

Activity: 1414

Merit: 1051

Spondoolies, Beam & DAGlabs

Quote from: wpgdeez on December 18, 2014, 11:12:22 AM

Looks like a lot of cost cutting has been done to maximize profit.

I wish. Not true.

wpgdeez

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Activity: 728

Merit: 500

Looks like a lot of cost cutting has been done to maximize profit.

johnyj

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Activity: 1988

Merit: 1012

Beyond Imagination

Quote from: Puppet on December 18, 2014, 04:40:06 AM

Im curious, does the underside of the board (bottom of picture) get warm at all? Looking at the design, I would think most air pressure will escape there, following the path of least resistance, and relatively little air will flow particularly over the top heatsinks. Id try channeling the air by blocking most or all of the clearance to the underside and using a fan with perhaps lower CFM but high static pressure.

Exactly, the construction reminds me of Avalon gen 1, you can narrow down the other channel to increase the air flow, but I think the effect will be minimal, since that original fan is a 2A high static pressure fan. The whole case is very cool, there is no direct contact between the heat sinks and the case

In my experience, the optimal output of 120x38mm fan is around 120CFM, where noises are still tolerable. Above that, you will dramatically increase the noise without too much improvement of airflow, a 200 CFM fan would sound 4x more noisy than a 120 CFM fan

johnyj

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Activity: 1988

Merit: 1012

Beyond Imagination

Quote from: Biffa on December 18, 2014, 04:27:43 AM

To test different fans this is what I did:

That's a nice idea! Grin

You can even install a fan speed regulator outside the case

Have you tried GT1850 with the SP20 set to 0.6v?

Dexter770221

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Everyone that done review have hashrate dip to 0 in 1day hashspeed chart. In your case was the same? This units resets itself in 1 day periods?

Puppet

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Quote from: johnyj on December 17, 2014, 11:33:00 PM

It uses a channel design to cool both the heat sink and the VRM on the back of the board, so an open case cooling solution might not be as optimal

Im curious, does the underside of the board (bottom of picture) get warm at all? Looking at the design, I would think most air pressure will escape there, following the path of least resistance, and relatively little air will flow particularly over the top heatsinks. Id try channeling the air by blocking most or all of the clearance to the underside and using a fan with perhaps lower CFM but high static pressure.

Biffa

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To test different fans this is what I did:

johnyj

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Beyond Imagination

I only replaced the metal screws with rubber pins, it does not really make a lot of difference, noise at 1 meter (20% fan) dropped from 67 db to 66db. To replace with my own fan, an adapter is needed, do it later

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