I'm not going to use them so they may as well go to a good home.

$100 the lot...

Anyone selling an S4+ in the UK . I already have two and am looking to expand that number.
Can pay £ or BTC .

Thanks in advance.

I just wanted to give little positive feedback .

I ordered 2 x S4+ on Friday 3rd at 16:00 Hrs.. I paid 8.053 BTC in total including UPS shipping to the UK.
They've arrived this afternoon at noon on the 8th .. Very impressed with payment to mining time.

Straight out of the box, plugged the 1st unit in, configured a new password and it's up and running at 2,582 . I guess most importantly all the ASIC chips read 'o' so nothings broken on arrival ..

So far so good.. Time to get the 2nd miner out.

Only thing that made me raise an eyebrow was that out of the box they're configure to start mining in the antpool for them.. While i was getting sorted i heard the miner fire up . I do wonder how many units are out there in default config mining for them.

Running 6 here all flawlessly for months.
3 bought direct and 3 bought from here all running at around 1.3TH/s

As for them not running at 1.7TH/s when i first got them and just because I wound everything up to 11 i got 1.6, 1.68 and 1.77.

They are far happier at 1.3TH/s and so are my power bills.

I'd like more but we'll more chance of pigs flying..

Well that turned into something unexpected , but it all helps.

If your Canadian winters can't cool the units then it's saved me bothering to even try and test these tomorrow, i'll drop them in the room and put them back to auto.

Not so surprising is moving the fans back to auto after doing the firmware upgrade temperatures are down and voltage it up.

As for the mining so they were bought for bitcoin, it was my looking into something i should have left alone until i at least understood the basics of what these do.

Learning in public can and is appearing to be painful..

As an addendum to my last reply, it's important to note that i'm really happy so far with the SP20's and the hash rates they are putting out.
I'm just curious about finding how and why they tick and finding the balance between power draw and hashing rates.

Given the progress i made from advice in another thread running 2 SP20's from 2 PSU's and finding a happy medium that'll be the way forward, it's simple curiosity that's got me asking how and why these things work and what they could do with excessive cooling. Especially until i need to pay for the power! At that time, it'll be low and slow

OK i've thrown in a bit of a red herring in the fan speed. The fans were at auto when i was getting those mega numbers and it sounded like a wind tunnel in here and was mighty warm.
I set them to 10 after sitting next to the machines to take my screenshots and compose my post.

As for firmware I am using 2.6.7 and there is auto fan in there (see screenshots) :

https://dl.dropboxusercontent.com/u/201234/gallery/Firmware.jpg

https://dl.dropboxusercontent.com/u/201234/gallery/Fan.jpg

Here's my Acis stat screen :

https://dl.dropboxusercontent.com/u/201234/gallery/acis.jpg

Tomorrow these are being moved into the cold room rather than my lounge, that should keep the temps down far more than this ambient room temp.

I'm also toying with spinning the fan around (test done) and sticking it in front of a portable AC unit thats in there running and seeing if having the fans run 10 on and it sucking in cold AC air can get some numbers crunched at a quieter level.

https://dl.dropboxusercontent.com/u/201234/gallery/fan_reverse.jpg

I was just trying to understand why when i'd not made any changed to the SP20 that the hash rate figures rose so high, after all the only thing i'd done was to change the pool it was mining.

I have asked ST direct via a support call if the hashing is linked to fan speed via voltage as if the fan speed being on nuts has the system draw more power and thus crunch the numbers higher then having a fan reversed sucking in cold AC air and the fans set low isn't going to do anything, surely then i'm just going to have a rig running at 1.4TH/s just really cooly.

Given what you've said about chips throttling due to heat, i'm actually hoping having these cool by the AC and sucking in the air that the hash rates will be even higher as the chips can continue to work harder without getting hotter. Either way we'll know tomorrow is ST don't reply today to that question via a ticket.

So it's not hard to confuse me about my SP20's right now but this is really don't understand.

Right now, all SP20's have their fans set to auto and i can see they are all pulling somewhat the same mining rate. Their temperatures aren't very different but over the last 5 minutes I have units reporting 1428, 1586 and 1865 . This is quite a difference and i see it reporting that rate to MRR too :

https://dl.dropboxusercontent.com/u/201234/gallery/smash1.jpg

https://dl.dropboxusercontent.com/u/201234/gallery/smash3.jpg

https://dl.dropboxusercontent.com/u/201234/gallery/smash2.jpg

The only thing i've changed of late was my pool , but this was done at MRR and not locally. I switched the 'when not mining' pool to CKPool From BTCGuide as a test.

Would this pool change have had any effect on the local hash rate of the machine (i don't think so) If not any ideas ?

Many thanks Biffa, i got there with a reply thankfully from MRR

All happily running and pulling their weight .

https://www.dropbox.com/sh/kojulq23a15nily/AADJi4bFZZcJCrn2RNwOZmf1a?dl=0#lh:null-hash.jpg

I don't want a refund i'm happy mining them, the 3 of them right now are currently running at 1613, 1625 and 1592 i'm very happy.
I was just seeing what i could do with them that's all.

All, still clearly learning and digging around and i made the mistake of assuming i knew what type of miner i had to when i added it to rig MRR overnight i ended up with some peeved people.

I thought it was a Scrypt rig , but the two people that hired them overnight told me otherwise along with some other choice words!

Can someone point me in the right direction? Thanks in advance.

Yep i think that's exactly what was going on. With a little tweek to the settings with everyones help it seems to be working

I think there was some misunderstanding , i'm not running 1 for 1 i have 2 for 2 , if that makes sense. I just think i had them wired incorrectly and even with what i thought was a spread load something kept going off. But it's been stable for a few hours now.

No , it seems like something was tripping. Strange as both PSU's were still spinning and active.

I was thinking i had maybe too much load one one PSU and in the end i've got like a criss cross power cabling going and with the revised power settings i seem to be happily getting just short of 1400 GH/s out of each of them and the power is quite happy.

It is a bit warm in here though which i know will not be an issue in their final destination.

I checked out 3 units a few hours ago no problems. The shop does indeed go to Shopify . The last ones i ordered on Tuesday and they arrived by DHL yesterday.

I've already learnt a few things so hang on in there.

Power for me at home is .0501 KW/h , however these will be going to a farm building where it's about half that. I'm always looking for a way to reduce power and noise and was happy to learn about the firmware upgrade with fan control.

When philipma1957 suggested i can run two SP20's off the power supply i thought i'd give it a go and see what happens.

Initially i didn't do anything except stack them, flip them and power up.

https://dl.dropboxusercontent.com/u/201234/gallery/side_small.jpghttps://dl.dropboxusercontent.com/u/201234/gallery/rear_small.jpg

The units happy sat there for about an hour running at 1.3 or 1.4TH/s .. Couldn't believe it, surely this is the solution to my power concerns.

https://dl.dropboxusercontent.com/u/201234/gallery/1374.jpg
https://dl.dropboxusercontent.com/u/201234/gallery/asic1.jpg

Power consumption is more than acceptable at 1935.7w for 2 units :

https://dl.dropboxusercontent.com/u/201234/gallery/power.jpg


Then i could hear the units start to spin up and down. A quick look at the miner page and the hash rate had halves. A check on the ASIC stats it seems the the power connection is lost on the daisy chain on the units :

https://dl.dropboxusercontent.com/u/201234/gallery/power2.jpg

So i'm guessing it's a balancing act of finding what draw you can handle on 1 PSU before you hit an overload.

I did try the settings show by Philip but then each miner would only output around 550GH/s .

I've now changed the daisy change configuration on the back of the power the try and spread the load across all connections from the PSU's and the SP20.. If i could find a happy medium around 1.3TH/s sharing a power supply then that would be fantastic, even if i have to upgrade to a 1000w PSU as it means i can run another 3 machines without buying any more PSU and Amazon will return these and i get a £100 saving, which is 1/3rd of another miner. However if i can find the right balance using these i have then at £70 a PSU that's quite a saving up front and then on power draw.

Thanks for the continued help all..

Hi all, been lurking for a while and picking up great info so thank you.

Yesterday my 3 SP20's arrived , got to say the service from Spondoolies was fantastic.
After a bit of reading i decided to go for the Corsair CX750M power supplies, 6 of them to be exact. I figured a nice spread of power and if i lost one then the miner wouldn't be totally down.

This is my setup :

https://dl.dropboxusercontent.com/u/201234/gallery/IMG_1351_small.jpg

A bit of in house testing before moving them to the garage and wow is the room hot..

No matter what fan or power configuration i seem to use they are only running at around 1582 each. One unit is sitting at 1.6 but this is still , but sometimes it's less and it's just scraping the +/-10% you would expect.

If i set the power to nuts mode maybe a bit more , but i find it best to have everything set to medium as the extra noise and power drain isn't producing anything more by any viable magnitude.

So my question : Is this a power limit? I'm seeing some people are getting 2.1TH/s from their units. I've set the power settings found in the forum to those and nothing more. To start powering on through to the advertised 1.7TH/s should i be running 2 x 850 or 2 x 1000w PSU ?

Other than that, thank you for the tip on BTC Guild i'm happily mining away with 4.42TH/s