[CLOSED] ASICMiner Prisma 1.4th/s - 1.47 BTC

[jelin1984]

Is the batch 6 still open for orders?

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[CrazyGuy]

The reason I asked is because I have an EVGA 1300 and I have 8 pcie cables coming out of it, I just didn't remember if I had pulled extra cables from another EVGA 1300. So the dilimma with that PSU is not a limit on the number of pcie connectors on the PSU, but the number of cables that they provide by default . You just need to find someone that sells aftermarket pcie cables that are compatible with the EVGA 1300 and order 2 for each unit.

Forgive my ignorance here but where did you plug the extra 2 cables on the power supply?

I might be thinking of my corsair 1200. how many 4 pin molex adapters does it come with? If 4 separate cables for molex, you could  buy 2 molex to pcie adapters. Youll need the pcie connector split from two seperate 4 pin molex on two different cables

[mrpark]

You cant buy extra cables for the EVGA 1300.

1) there are only 6 slots for the red cables. (the other slots say CPU)
2) although there a are 6 cables, some have double PCI-E 6 connectors. (but apparently we can only use 1 PCI-E 6 per cable)

So the conclusion is you need another power supply with the 1300, unless you can use a single cable (and adapter in the middle, and on the end) to power two PCI-E 6 slots.

[GrapeApe]

The reason I asked is because I have an EVGA 1300 and I have 8 pcie cables coming out of it, I just didn't remember if I had pulled extra cables from another EVGA 1300. So the dilimma with that PSU is not a limit on the number of pcie connectors on the PSU, but the number of cables that they provide by default . You just need to find someone that sells aftermarket pcie cables that are compatible with the EVGA 1300 and order 2 for each unit.

Forgive my ignorance here but where did you plug the extra 2 cables on the power supply?

I might be thinking of my corsair 1200. how many 4 pin molex adapters does it come with? If 4 separate cables for molex, you could  buy 2 molex to pcie adapters. Youll need the pcie connector split from two seperate 4 pin molex on two different cables

It came with 2 separate cables with 2 molex connectors each. So I can make one out each of those. Man thanks for your help today.

Oh by the way after learning the BE Controller works on as little as 5V I am now using a wall adapter and it's working fine with that as well. 5V 3A

[jelin1984]

Any remaining prisma from batch 5
I want to buy on e

[mrpark]

I also would like to know the answer to this question, can you try it on your miner putting 1 cable with the middle and the end adapter being used? Does it get hot that way? (maybe not a good idea to try this)

The reason I asked is because I have an EVGA 1300 and I have 8 pcie cables coming out of it, I just didn't remember if I had pulled extra cables from another EVGA 1300. So the dilimma with that PSU is not a limit on the number of pcie connectors on the PSU, but the number of cables that they provide by default . You just need to find someone that sells aftermarket pcie cables that are compatible with the EVGA 1300 and order 2 for each unit.

Forgive my ignorance here but where did you plug the extra 2 cables on the power supply?

I might be thinking of my corsair 1200. how many 4 pin molex adapters does it come with? If 4 separate cables for molex, you could  buy 2 molex to pcie adapters. Youll need the pcie connector split from two seperate 4 pin molex on two different cables

It came with 2 separate cables with 2 molex connectors each. So I can make one out each of those. Man thanks for your help today.

Oh by the way after learning the BE Controller works on as little as 5V I am now using a wall adapter and it's working fine with that as well. 5V 3A

[CreativeMining]

Hello

Are these on hand and available to order?

[GrapeApe]

I also would like to know the answer to this question, can you try it on your miner putting 1 cable with the middle and the end adapter being used? Does it get hot that way? (maybe not a good idea to try this)

Yeah I'm not really sure how I'm going to go about this yet. But I think I can only get 1 extra pcie safely using the molex connectors.

[mrpark]

This is what im referring to, so I guess we can't use the middle 6 pin PCI-E because the cable will be too how with both connectors in use?

[GrapeApe]

This is what im referring to, so I guess we can't use the middle 6 pin PCI-E because the cable will be too how with both connectors in use?

I don't think that solves the problem. It seems the same as using one.

[mrpark]

That's what I thought 

This is what im referring to, so I guess we can't use the middle 6 pin PCI-E because the cable will be too how with both connectors in use?

I don't think that solves the problem. It seems the same as using one.

[CrazyGuy]

Any remaining prisma from batch 5
I want to buy on e

Batch 6 is open, batch 5 is sold out.

[ferncreekminer]

I'm planning on using 2 x EVGA G2 750Watt PSU per Prisma miner; the 750W has 4 PCIE connectors - so 2 per hashboard isn't a problem.

If anyone is looking for a good deal Amazon has the best price currently; plus their MiR is good for 2 PSUs.

[philipma1957]

How did you get 8 Cables on an EVGA 1300? I guess you had some around?

Do those EVGA PSU come with 8 pcie connectors? I would recommend using all 8 connectors to lower the load on each cable. If you are only using 4 of the connectors, make sure the cables and connection points aren't getting hot. You are drawing about 250 watts through each cable with 4, so make sure they are high quality 16 guage and bump up to 8 if possible, or risk melting the cables or connectors.

Okay did some rearranging. Thanks for the advice CrazyGuy I was starting to get concerned about the heat, but now with 8 cables all is well. This does put me in a bind though as far as my psu choice is concerned.

Sorry for not explaining. I didn't. I moved the 1300 up to power 3 S3's and am using my EVGA 1500 for the Prisma, it has 8 cables. I'm still in a bind here though because I have 2 1300's coming today and 2 more prismas to power.
SHIT...

EDIT; I do have a bunch of extra cables is there some configuration I'm missing to get 8 out of it? I didn't think the 2 next to the VGA connectors were in play.

yes you can.  you should have 6 pcie cables 2 have 2 plugs.  4 have 1 plug.

am I correct??

my evga  has 6 cables  4 with 1 plug 2 with 2 plugs.

look closely   this is the 2 two plug cables   make believe that fan is the plug end fan on the long tube.

this will be two cables with 4 plugs  one plug in eacb side.   THIS IS NOT ENOUGH

you then have the 4 single cables plug one to each side.  so six cables pull 1200 watts.  each side of the unit has 1  cable with the long plug and 1/2 of the two plug cables  I don't have enough hands to hold it in place. but those 6 cables can carry 1200 watts even 1215.  if you think you understand the way to wire it please do and shoot a photo to us. I can confirm.

[CrazyGuy]

How did you get 8 Cables on an EVGA 1300? I guess you had some around?

Do those EVGA PSU come with 8 pcie connectors? I would recommend using all 8 connectors to lower the load on each cable. If you are only using 4 of the connectors, make sure the cables and connection points aren't getting hot. You are drawing about 250 watts through each cable with 4, so make sure they are high quality 16 guage and bump up to 8 if possible, or risk melting the cables or connectors.

Okay did some rearranging. Thanks for the advice CrazyGuy I was starting to get concerned about the heat, but now with 8 cables all is well. This does put me in a bind though as far as my psu choice is concerned.

Sorry for not explaining. I didn't. I moved the 1300 up to power 3 S3's and am using my EVGA 1500 for the Prisma, it has 8 cables. I'm still in a bind here though because I have 2 1300's coming today and 2 more prismas to power.
SHIT...

EDIT; I do have a bunch of extra cables is there some configuration I'm missing to get 8 out of it? I didn't think the 2 next to the VGA connectors were in play.

yes you can.  you should have 6 pcie cables 2 have 2 plugs.  4 have 1 plug.

am I correct??

my evga  has 6 cables  4 with 1 plug 2 with 2 plugs.

look closely   this is the 2 two plug cables   make believe that fan is the plug end fan on the long tube.

this will be two cables with 4 plugs  one plug in eacb side.   THIS IS NOT ENOUGH

you then have the 4 single cables plug one to each side.  so six cables pull 1200 watts.  each side of the unit has 1  cable with the long plug and 1/2 of the two plug cables  I don't have enough hands to hold it in place. but those 6 cables can carry 1200 watts even 1215.  if you think you understand the way to wire it please do and shoot a photo to us. I can confirm.

I think this would result in the same 250 watt load on each split cable, even if the cable is going across 2 boards. 1 board with a single cable and half of a split cable would draw 125 watts at each connector. The split cable would provide 125 watts on each board it is connected to. This would result in 250 watts on one cable, regardless of how it is configured.

[suchmoon]

I think this would result in the same 250 watt load on each split cable, even if the cable is going across 2 boards. 1 board with a single cable and half of a split cable would draw 125 watts at each connector. The split cable would provide 125 watts on each board it is connected to. This would result in 250 watts on one cable, regardless of how it is configured.

Those EVGA power supplies can handle 250W. I know it exceeds PCI-E specs and I would normally advise against that, but I have EVGA 1300s powering some Zeus gear, which is notorious for excessive power consumption (e.g. 1050W on 4 PCI-E 6-pin connectors) for a few months now without any issues. Just take care with the connectors both at the device and at the PSU - sometimes the pins in the connector get pushed out or otherwise don't make good contact and that will result in melted plastic. Monitor the temperatures and you should be fine. Don't sue me if your house burns down.

[philipma1957]

How did you get 8 Cables on an EVGA 1300? I guess you had some around?

Do those EVGA PSU come with 8 pcie connectors? I would recommend using all 8 connectors to lower the load on each cable. If you are only using 4 of the connectors, make sure the cables and connection points aren't getting hot. You are drawing about 250 watts through each cable with 4, so make sure they are high quality 16 guage and bump up to 8 if possible, or risk melting the cables or connectors.

Okay did some rearranging. Thanks for the advice CrazyGuy I was starting to get concerned about the heat, but now with 8 cables all is well. This does put me in a bind though as far as my psu choice is concerned.

Sorry for not explaining. I didn't. I moved the 1300 up to power 3 S3's and am using my EVGA 1500 for the Prisma, it has 8 cables. I'm still in a bind here though because I have 2 1300's coming today and 2 more prismas to power.
SHIT...

EDIT; I do have a bunch of extra cables is there some configuration I'm missing to get 8 out of it? I didn't think the 2 next to the VGA connectors were in play.

yes you can.  you should have 6 pcie cables 2 have 2 plugs.  4 have 1 plug.

am I correct??

my evga  has 6 cables  4 with 1 plug 2 with 2 plugs.

look closely   this is the 2 two plug cables   make believe that fan is the plug end fan on the long tube.

this will be two cables with 4 plugs  one plug in eacb side.   THIS IS NOT ENOUGH

you then have the 4 single cables plug one to each side.  so six cables pull 1200 watts.  each side of the unit has 1  cable with the long plug and 1/2 of the two plug cables  I don't have enough hands to hold it in place. but those 6 cables can carry 1200 watts even 1215.  if you think you understand the way to wire it please do and shoot a photo to us. I can confirm.

I think this would result in the same 250 watt load on each split cable, even if the cable is going across 2 boards. 1 board with a single cable and half of a split cable would draw 125 watts at each connector. The split cable would provide 125 watts on each board it is connected to. This would result in 250 watts on one cable, regardless of how it is configured.

yeah you may be correct but I don't think so.   the 2 jacks on each board pull 250-260 watts. they should pull more power on the single cable due to less resistance .  the dual plug cables  will be more resistant to the draw then the single plug cables.   each board get to pull 250-260 watts across  3 hot wires on the single cable and share 3 hot wires on the dual cable .  so each board is getting 4.5 x 18 awg wire.

that should work.
 remember the two jacks on the board  share common hot lead and common ground.

the draw should self level.   (in theory) .

 I did a lot of this on the short tubes and I got 290 freq and 1000  watts doing it this way the cables did not overheat.

[philipma1957]

I'm planning on using 2 x EVGA G2 750Watt PSU per Prisma miner; the 750W has 4 PCIE connectors - so 2 per hashboard isn't a problem.

If anyone is looking for a good deal Amazon has the best price currently; plus their MiR is good for 2 PSUs.

if that is a split rail psu it won't work.  I have a 750 watter and it use up to 3 cables  on the fourth it overloads.  mine is a split rail model .  check and see if it is.

[CrazyGuy]

That makes sense, connectors on a single rail should take path of least resistance.

[kodiak1120]

Would two CX750's work for one Prisma?  

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139040

Also, can I run them both off of 110V or would I need a 220V outlet?

Thanks.