[ANN] Selling Server PSU's with PCI-e cable

[mavericklm]

Hoi!

What temperature is that warm environment?

I can give it 10c, or just put it in a shed where is ~0c

Groetjes,
mav

[Burks]

Why Bitcoin +1%?

I buy the PSU's & cables in euro.

there are 2 reasons the price is +1%
- btc/eur rate is volatile, so it covers some of the risk
- conversion isn't free (usually a percentage of the amount)

[KNCFUN]

Does these 1300w server  psu's work well with S7 miners ?

[Burks]

no, that's why I swithed to a heavier PSU

[Burks]

Hoi!

What temperature is that warm environment?

I can give it 10c, or just put it in a shed where is ~0c

Groetjes,
mav

warm i mean 30+
One customers has them running at 20c and sometimes they fail... (dunno frequency/ precise temps)
I can make a version with 10 connectors, but I cannot guarantee it will be able to pull a S7 all by itself...

regards

[KNCFUN]

Bitmain suggests 1600w+  for S7 miner

[Grim]

1300 Watt IBM still in stock as the OP says?

[Grim]

Hoi!

What temperature is that warm environment?

I can give it 10c, or just put it in a shed where is ~0c

Groetjes,
mav

warm i mean 30+
One customers has them running at 20c and sometimes they fail... (dunno frequency/ precise temps)
I can make a version with 10 connectors, but I cannot guarantee it will be able to pull a S7 all by itself...

regards

Why do they fail? Cuz your customer tries to pull over 1300 watt??

It would also be nice a to see a efficiency curve because highest efficiency is usually only available at 50% load.

[Burks]

Hoi!

What temperature is that warm environment?

I can give it 10c, or just put it in a shed where is ~0c

Groetjes,
mav

warm i mean 30+
One customers has them running at 20c and sometimes they fail... (dunno frequency/ precise temps)
I can make a version with 10 connectors, but I cannot guarantee it will be able to pull a S7 all by itself...

regards

Why do they fail? Cuz your customer tries to pull over 1300 watt??

It would also be nice a to see a efficiency curve because highest efficiency is usually only available at 50% load.

1300 watt not on stock anymore.

I'm working on a cheaper board for the 2880w IBM PSU as wel as a smaller PSU (1300w+)

At the moment I only have the 1440watts on stock.

About efficiency, I just bought this baby: https://www.elektor.com/voltcraft-digital-clamp-multimeter-vc-330
This week I will be measuring effciencies of the smaller PSU's

[Grim]

About efficiency, I just bought this baby: https://www.elektor.com/voltcraft-digital-clamp-multimeter-vc-330
This week I will be measuring effciencies of the smaller PSU's

yep great way to test efficiency

compare your 240volt ac amperage to your total 12v dc amperage.

The difference determines your efficiency.

Looking forward to seeing your "real life" numbers.

[Grim]

I noticed just now that you have 1440 Watt PSUs in stock?

I would be interested in 2 of these 1440 Watt units, any details?

Shipment would be Europe, specifically Austria.

[Indianacoin]

Will one 900W Dell PSU be able to run 2 Antminer S3+ miners?

If so will I still be able to overclock one miner since there are six 6-pin PCI-E cables coming with a single PSU. I will connect 4 of them with one miner that I want to overclock and I will run the other one normally with 2 of the remaining cables.

Also I noted that the shipping cost to India is nearly double of the miner = € 52,59
Can I get some discounted quote on this deal please?

[Burks]

About efficiency, I just bought this baby: https://www.elektor.com/voltcraft-digital-clamp-multimeter-vc-330
This week I will be measuring effciencies of the smaller PSU's

yep great way to test efficiency

compare your 240volt ac amperage to your total 12v dc amperage.

The difference determines your efficiency.

Looking forward to seeing your "real life" numbers.

Unfortunately, I forgot a phenomena: "power factor"
So now I've got this baby: http://www.conrad.com/ce/en/product/1340670/VOLTCRAFT-4500PRO-DE-9999-hrs

This weekend I'm going to do some experiments with a Bitmaintech, 2880 and my new PSU.

I noticed just now that you have 1440 Watt PSUs in stock?

I would be interested in 2 of these 1440 Watt units, any details?

Shipment would be Europe, specifically Austria.

Normally I supply them with 8x PSU (10x PSU is +5 euro)
Depending on the temperature they will do between 1000w and 1400w

shipping for 2 is about 20 euro.

Will one 900W Dell PSU be able to run 2 Antminer S3+ miners?

If so will I still be able to overclock one miner since there are six 6-pin PCI-E cables coming with a single PSU. I will connect 4 of them with one miner that I want to overclock and I will run the other one normally with 2 of the remaining cables.

Also I noted that the shipping cost to India is nearly double of the miner = € 52,59
Can I get some discounted quote on this deal please?

I don't have the 900's anymore. I would advise a 1440w.
Than you can overclock both S3+'s

shipping for 1 is still 35 :s

[Grim]

8 pci-e 1440w unit is fine for me

I would take 2 units


But I would appreciate an efficiency test first. 


(You can cut open the power cable "enclosure" and test the ac current-in that way.)

[Burks]

8 pci-e 1440w unit is fine for me

I would take 2 units


But I would appreciate an efficiency test first. 


(You can cut open the power cable "enclosure" and test the ac current-in that way.)

Ok, so first test results are in:

Summary
The bitmaintech is really efficient with around 93,9-93,5% efficiency on a S7 batch 8. The new 1300+w PSU that I’m working on reaches about 89,5%. I did not fully test a 2880 with j4bber board, but on first sight, it is even more inefficient.

Testing procedure
I’ve hooked both PSU up to a Batch 8 S7. Next to that I tested: 1-4x S1 on the 1300+, 4x S1 on the 1440 and 2880 with jabber board on 1x S7 Batch 8 & 1x S7 batch 7.

- All measuring has being done with a Voltcraft 4500 Advanced powermeter, a Voltcraft VC-330 powerclamp and a Tenma 72-7725
- Voltages were measured at PCI-e plug.
- Time intervals was 10 and 20 min.

Results S7 batch 8


Next to that I tested the efficiency with some antminer S1's as load.
- tested with 1/2/3/3,5/4 x S1 on full speed


The 1400 got around 88% and the J4bberwock with 2880 drew 2875w for a S7 Batch 8 and a S7 batch unknown.
If there is enough interest I will test more PSU's
And if you have measurement wishes, please let me know!

regards

[Grim]

Ah nice numbers for the bitmaintech. (good efficiency)

I would like to order 2 units of the bitmaintech. (how many pci-e plugs?)

Are you doing escrow? and if, with whom?

Shipping is to: AUSTRIA

[Burks]

Ah nice numbers for the bitmaintech. (good efficiency)

I would like to order 2 units of the bitmaintech. (how many pci-e plugs?)

Are you doing escrow? and if, with whom?

Shipping is to: AUSTRIA

Haha, unfortunately, I don't sell those (yet)

And still, before you have them here, you're looking at 145-160 euro per PSU without sales tax, so that efficiency comes at a price :S

[Grim]

That price per unit is totally fine for me if the peak efficiency is as good as you say. (93-94%)

 


Actually I don't care about the single PSU wattage.

I just need about 2500+ watt at high efficiency for now. (maybe more in future)

The units can be as low as 900 watt or as high as 2880 watt ... I simply order that much units to fill my "wattage" needs.


(yes i know NOT to plug different psus to one and the same device
due to slight voltage difference of each unit/load)

[Burks]

That price per unit is totally fine for me if the peak efficiency is as good as you say. (93-94%)

 


Actually I don't care about the single PSU wattage.

I just need about 2500+ watt at high efficiency for now. (maybe more in future)

The units can be as low as 900 watt or as high as 2880 watt ... I simply order that much units to fill my "wattage" needs.


(yes i know NOT to plug different psus to one and the same device
due to slight voltage difference of each unit/load)

I can make of 3 PSU's for 2x S7
That case the PSU will be around 92-93% efficient.

[Grim]

3x ~900watt?

If they deliver 93+% peak efficiency I'll take them.