Topic: S3+ Bitmain Miner Power Arrangement (Read 5407 times)

^dead on. 1 connection per blade is sufficient when using a proper cable for the job.

one additional thought though - by using the second connector as well, it better distributes current on the PCB. This would MARGINALLY reduce resistance in the PCB and ensure the area around the single connector doesnt get warm. However, no issues or PCB failures have been seen yet, and any power savings would be on the order of 1-2w/PCB - so its not really necessary to plug in all 4 connectors unless you actually happen to have enough cables to begin with (which most PSUs wont - such as the EVGA 1300 having 6 cables only (2 of which are double connectors though)

When I first started this tread I was under the assumption that the card required extra power though each connecter, when in reality this is not true. Yes the card does require more power when OC’d but this can be drawn from one connection providing the cable can take it.

I believe the reason its recommend to plug in all four when over clocking, is because a standard PCIE with 18 awg cable will get hot and therefore burn out.

I have made my own cables using 16 awg and then from the connector block that connects to the PSU terminals I used 14 awg, even after 4 hours the cables and PSU were stone cold.

Don't you need to plug in the other two PCI-E connections if you overclock?

Thanks to everyone who contributed to this discussion  

I totally forgot to take some close ups of the Dell 2100w PSU. In the end I soldered the cables onto the terminals, this was instead of using spades. The terminals are slightly tapered so spades are not secure enough. The connecter blocks worked a treat.
The only thing is the PSU is quite loud, but thats not a problem because its in my Dads loft which is 22 miles from my house lol.
Currently there all OC’d at 250 and combined its hashing between 1900 – 2000. One thing I have noticed is one miner is running at 430GH not sure why quess ill have to research that one.
I’m back over there in two weeks so I’ll take voltage readings and provide and average Watt/GH.

Buying some more in a few weeks. BTCBTCBTC

Thanks 

thats correct.

Just about the start wiring the PCI-e plugs for the Server PSU. Could someone just quickly on confirm the plug wiring layout below is correct for the miner, thanks

Black = Ground
Yellow = 12v

Next homework assignment:  study 8-pin (6+2) PCIe power connector pinout

If you still couldn't get it, then I can't help you any further.

Why would BitMain so over estimate the wattage drawn at default and when overclocked if you can get it for so much lower than anyone else?  Oddly, I don't find that in any way a benefit to advertise that if they're incorrect. 

Also you're scaring me, I don't think you understand what you're talking about, especially in regards to this statement "Hint: Modern ATX PSUs that we use to power our miners nowadays are equipped with 6+2 pin PCIe power connectors (three +12V circuits) instead of the legacy 6-pin ones (two +12V circuits).  They (6+2 or 8-pin PCIe power connectors) could theoretically handle up to 252W.  But don't take my word for it."  You do realize that that rating is ONLY with all 8 pins connected, the AntMiner has 6 pins at each connection.  Therefore what is the max. with 6 pins?  You've really got to do some more homework before you post any further.

Where exactly did I say I know more than the manufacturers?  That said, they're not technical deities either (couldn't even put together a decent S3 firmware).  My numbers are sound; it's more like you couldn't figure them out and I'm not about to resort to spoonfeeding and deprive you of the joys of discovery and the satisfaction derived from learning in the process.  If you really believe that my numbers are off, then illustrate it in detail.  Just saying so doesn't wash; but then again, that's how you roll it seems.  Right on cue, you continue to make stuff up.

Anyway, I was merely making sense of your "each 6-pin connector is rated industry standard at 192watts max., which the S3+ falls under per blade at default speed, but once you start overclocking if falls outside of spec" statement.  Industry standard of what?  Please elaborate on which industry it is a standard of.  Do you know where or how this "192watts max" is derived from?  To reiterate, an S3 overclocked to 250M at an ambient temperature of 29C draws around 180WDC/blade.  Yes, it's a sound number which you obviously haven't figured out yet; otherwise, we wouldn't be having this interesting discussion.  180W is clearly within the "192watts max" specification of a single PCIe power harness that you produced without any substantiation.  Yet, you continue to insist that "when Overclocked they do not fall within specs".  How does 180W not fall within the "192watts max" specs that you have been brandishing around?  It's your number, not mine.  I am merely applying it.

Like you, I also prefer a decent headroom when it comes to PSU loading (within reason considering cost/safety factor).  If it's working and you're happy and comfy using a particular PSU (overkill or not), then good for you.  I'm glad that your units are hashing safely.  However, there has already been a ridiculous amount of anecdotal and baseless posts in these forums and adding more does not help.  It's hard enough to sift the facts from fables and fabrications as it is.

Hint: Modern ATX PSUs that we use to power our miners nowadays are equipped with 6+2 pin PCIe power connectors (three +12V circuits) instead of the legacy 6-pin ones (two +12V circuits). They (6+2 or 8-pin PCIe power connectors) could theoretically handle up to 252W.  But don't take my word for it.

Homework Assignment: Read up on Molex Standard Mini-Fit Jr. power connector specs (as well as their HCS and Plus HCS variations for good measure.  Interesting stuff.)

Do not buy EVGA 1000W G2.

3x EVGA Supernova G2 1300W + shipping from germany to estonia is only 532,69 EUR.

1x EVGA Supernova G2 1300W works with 3 x Antminer S3+ at normal speed. No need for aplitters.


Not all of the S3+ does OC.   Only 30% of those working at Frequency 250 .

"From another thread i posted in, but it has relevance here,"

I just started S3 mining and went though similar PSU choice issues, in the end i went with 1:1      1 psu per 1 S3.

To give me some flexibility I went with a FSP Raider 750 Watt 80 plus Silver PSU, it has 4 6/8 pin pcie connectors so I can fill all the S3 power connectors,
apparently this allows you to overclock and keeps the unit slightly cooler per given freq.

Secondly, it has a common 12 V rail giving 60 amps which is more than enough for an S3 and allows the PSU to run at around 50% capacity which has an efficiency over 90%.

One thing I have noticed with some Gold modular psu's is they have multiple 12 V rails and may add up to 700-800 watts but only deliver 18 amps (per rail),
 if you power you S3 with one connector per side from a rail like this you are going to have trouble as an S3 needs 24-30 amps depending on who you read.

With lots of PSU's it does chew up more space and power points but you don't have a single point of failure and your not running your PSU at 90-100 % capacity.

Good luck with your PSU hunting.
Reply

Can make it with OC. 

Cheers and by 5 ants you mean at stock speed

I plan to OC these mo fo's

Clever guy! 

That's what I've tried to tell you since the beginning of the thread. 

This psu will be enough for 5 ants.

Just have to do some work. But be careful with the connections at the end of the psu. Have to be tight but if you solder them is the best.

Guys please chill out! 

I have decided to go with a server PSU because the purchase cost is so much less. As for overall running cost who knows? Once its all setup I will certainly post my WATT usage to compere against the ATX PSU crew.

I understand its not the S3/S3+ that requires all four to be used for the extra power. The extra two termanils are there just in case a user decides to install low rated cables (Cheap 18awg or 20awg). So the better the cable (16awg) then only two are required.

Feel like im double posting here because I have already mentioned the final design on another post, upto you guys to keep this alive but im out, thanks for everyones help ill see you guys later.

ATX PSU EVGA 1000W G2 x 2 will cost £280 plus possiable splitters and extra VGA cable as per my design early.

Server PSU Dell 2100w will cost £80 including all cables, blocks etc + my time to make them up.

Not the most prettest design but should work great.

Well, if you' want to respond like that, then I'll respond in kind.

And here we have a case of someone claiming they know more than other people including the manufacturer of the product he thinks he's an expert on ("I'll use your product, but you designed it wrong" attitude).  Please don't explain yourself, it shows a lot.  AC>DC Conversion?  That should be included in the PSU efficiency because all AC is converted to DC in the power supply, hnmmm but you have it listed separately.  When a power supply manufacturer lists the efficiency, they include for loss from conversion as well as heat for the rating.  Wall reading vs. from the power supply, well I have both of those listed in my readings, so your response is moot.  Please don't bother rereading your own posts, I think I've given you more than enough hints to your mistakes.  I feel sorry for people that might follow your advise and similar "If the wires get hot after ten minutes... easy to check...", but then if there is problems you have no responsibility to the possible damages your advise caused.

Hmmm...

Like firewire2013, you obviously are missing the fundamentals when figuring out PSU wattages/specs/performance.  Since it is so fundamental/basic when it comes to dealing with PSUs in relation to the devices they are powering, I refrain from spoonfeeding to give you both a chance to learn it yourselves the proper way through sound research and hard work.  However, I'm glad to offer hints to hopefully point you to the right direction:

-AC > DC conversion
-PSU efficiency
-WAC from the wall vs. WDC from the PSU
-carefully reread the first paragraph in my first link

I think those are more than enough hints to get you going.

I just set up another rig, its got 3 S3+'s underclocked to 218.75M with a EVGA 1600w P2 (Platinum).  The case has 10 case fans on a fan controller (controlling 6 of the fans).  The fan controller and the 10 fans are probably using about 25 or so watts.  The Kill-A-Watt at the socket (about 118.5+v) shows 1,127watts.  That's about 1,100 watts for the 3 underclocked S3+'s.  So that's about 365watts per each at 218.75M, at the wall.  If the power supply is about 92-93% efficient, that means each is using about 340watts at the power supply.

You can use only 1 pcie slot per board with no issue. I've run overclocked s3/s3+ units this way with EVGA 1300, enermax 1050, ultra 800, and an eternal 1350.

All do it without a problem. When possible I double up, but it's not really necessary. The cables can handle the load without issue on a quality psu. If not, the cable will be noticeably warm in under 10 min. Easy to test.

I sell good quality pcie splitters in my signature link if you really want to use splitters, but it's not required in my experience for the s3