Overclock 2 Antminers S3 using Corsair RM1000

[vortexz]

I want to OC my 2 s3.
I have corsair RM1000 PSU, it comes with 6+2 PCI cables,i only have 4 cables but both cables have a split at the end and comes with 2x 6 pin at the end, like in this picture :


I know i need to power all 4 slots in the S3 if I want to OC, can i use 1 cable to power 2x6 pin slots ?

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[Bitsaurus]

Use your molex connectors and buy quality molex to 6 pi PCIe connectors.  Make sure they are thick 18 guage or smaller wires and have good connectors (some cheap converters use cheap 20 guage cable).

If you overclock the S3 there is always the risk of burning the board which isn't covered by Bitmain warranty.

[vortexz]

what is molex connector ?

[jonnybravo0311]

Doesn't the RM1000 have 8 PCI-e connectors?  Also, how much are you planning to over clock?  You can safely do 237.5 (giving you 478GH/s) on two cables per unit.  If you're going to 250 (504GH/s) and beyond, then 4 connectors per miner is recommended.

[vortexz]

Doesn't the RM1000 have 8 PCI-e connectors?  Also, how much are you planning to over clock?  You can safely do 237.5 (giving you 478GH/s) on two cables per unit.  If you're going to 250 (504GH/s) and beyond, then 4 connectors per miner is recommended.

yes it has 8 PCI-e.and at the other end the cable is 6+2, but the end is split in 2x 6+2 like in the picture i posted above.can I use both of that to power 1 board?
i could try 237.5 first, yes

[jonnybravo0311]

Doesn't the RM1000 have 8 PCI-e connectors?  Also, how much are you planning to over clock?  You can safely do 237.5 (giving you 478GH/s) on two cables per unit.  If you're going to 250 (504GH/s) and beyond, then 4 connectors per miner is recommended.

yes it has 8 PCI-e.and at the other end the cable is 6+2, but the end is split in 2x 6+2 like in the picture i posted above.can I use both of that to power 1 board?
i could try 237.5 first, yes

Yes.  How many actual cables are there?  6 cables, 2 of them have splitters, or 4 and all 4 of them have splitters?  If it's the first, use 2 singles and 1 double per S3.  If it's the second, you're using 2 doubles per S3.

[vortexz]

4 and all of them have splitters.so i'll just use 1 cabe with both spliters, right ?
thanks !

[jonnybravo0311]

4 and all of them have splitters.so i'll just use 1 cabe with both spliters, right ?
thanks !

Look at this picture:


If you are going to use only 1 cable per S3, then you must plug it in according to how the green ovals show.  Personally, I would use 2 cables per S3, with each cable plugging into two connectors, either oriented like the green ovals, or the red rectangles.  That way each S3 has all 4 plugs filled.  You've got the cables for it.

[Bitsaurus]

4 and all of them have splitters.so i'll just use 1 cabe with both spliters, right ?
thanks !

Look at this picture:


If you are going to use only 1 cable per S3, then you must plug it in according to how the green ovals show.  Personally, I would use 2 cables per S3, with each cable plugging into two connectors, either oriented like the green ovals, or the red rectangles.  That way each S3 has all 4 plugs filled.  You've got the cables for it.

I'm quoting the picture so it makes sense:

If you're going to try to load balance (not that it is really necessary on a RM1000), then plug once chain into the green oval on the right (that will power 2 boards).  Plug the second chain into the green oval on the left.  Each chain has 2 6+2 connectors if I'm not mistaken, but you only need the 6 pin part for the S3.

[jonnybravo0311]

4 and all of them have splitters.so i'll just use 1 cabe with both spliters, right ?
thanks !

Look at this picture:
snipped

If you are going to use only 1 cable per S3, then you must plug it in according to how the green ovals show.  Personally, I would use 2 cables per S3, with each cable plugging into two connectors, either oriented like the green ovals, or the red rectangles.  That way each S3 has all 4 plugs filled.  You've got the cables for it.

I'm quoting the picture so it makes sense:

If you're going to try to load balance (not that it is really necessary on a RM1000), then plug once chain into the green oval on the right (that will power 2 boards).  Plug the second chain into the green oval on the left.  Each chain has 2 6+2 connectors if I'm not mistaken, but you only need the 6 pin part for the S3.

Yes, you can plug one split cable per green oval or you can plug in using the red rectangles if you use two cables from the PSU (2 cables turn into 4 PCI-e connections into the S3).  Yes, the S3 uses the 6 pin (the +2 is not used).  If you're only using 1 cable per S3 (1 cable splits into 2 PCI-e connectors), then you MUST plug it in as the green ovals show - either the one on the right, or the one on the left.  If you try to plug only 1 cable into the red rectangles, it won't work - only a single board would be powered.

[Bitsaurus]

Carefull, 360W / 12V  = 30A total /  4 Connectors

Cables must carry 6A / Connector, plugging the 2 end with draw 12A from a single cable.
When OC its more ... 

Cable/Connector can hold 10A, you will overheat your plug and possibly damage your miner.

Also 1000W is a bit short in term of power, already loaded at 80% before OC.

I recommend a stronger P/S
http://farming-money.com/1200w-supernova-p2-power-supply-w-10yr-warr/

A good power is the first key for a happy miner 

For a Gold Corsair 80% load is perfectly fine.  You can even run it 100% load 24/7 for a couple years and probably not have a hiccup.  The max output drops every year though.

[Bitsaurus]

80% is the load target, perfect if not OC. 
With OC, 450W-500W/each S3 will load P/S near its limit.

100% Load will lead to a failure one way or other.

Trust me, I'm a professional system integrator.
I worked on stress test : vibration, thermal shock, high and low temperature
MTBF mean something for me, I know how it's done.

My 2 cents

Trust me.  I'm running my GPU farm and not one of my PSU's is running under 85% load with an ambient of about 85F.  My 6870/6950 rigs have been mining for over 3 years continuously on the same power supplies - first BTC, then scyrpt, and now CN.

The only PSU I have had fail was a Seasonic 750 Gold where one of the cables melted - probably a bad cable since the PSU has been putting out 720 for the last 2 years no problem (no ripple).

This is not recommended for the cheap bronze or 80+ PSUs or for home use due to fire risk.

[Bitsaurus]

Damn good supply !

Lucky you, but I do not load that much.
Not burning the home should be a primary concern

Just because it works, didn't mean it's ok
Electricity have its own set of rules ...

Just saying, I never had a argument with my ex on P/S
Feel strange and good at the same time, disturbing  lol

Yeah mining operates on it's own rules.  A lot of people are probably pulling more from their wall than they should considering the wiring in their homes/apartments.  All my miners are in an area with a fire suppression system so even if a fire started the worst scenario would be my miners would die, not people.

Look back at the old GPU miner threads - people awoke to the smell of smoke or saw flames/coming out of their cards.

People had their BFL PSUs go up in flames very frequently and some had their Singles go up in smoke from bad design.