Update Large review of Finksy/J4bbrwock server psus compared to ATXpsu-photos up

[Prelude]

Dave,

I'm not sure about using those. What's the duty cycle on them? Car radiator fans don't run 100% of the time the car is on, and I don't think they're built for it.

Thanks for chiming in.  That's why I wanted opinions for this application.  I'm not sure on the duty cycle.  It sounds like I need to do some research. 

EDIT:  If you happen to know of a 12 inch fan with long duty cycle and low watts, please let me know.

Yep, don't want to end up with something that won't do the job and have to buy twice. Might end up having to use something 120/240v since a 100% duty cycle fan will probably tend to be AC in that format I imagine? Not sure though.

[dmwardjr]

Dave,

I'm not sure about using those. What's the duty cycle on them? Car radiator fans don't run 100% of the time the car is on, and I don't think they're built for it.

Thanks for chiming in.  That's why I wanted opinions for this application.  I'm not sure on the duty cycle.  It sounds like I need to do some research.  

EDIT:  If you happen to know of a 12 inch fan with long duty cycle and low watts, please let me know.

Yep, don't want to end up with something that won't do the job and have to buy twice. Might end up having to use something 120/240v since a 100% duty cycle fan will probably tend to be AC in that format I imagine? Not sure though.

They are $29.99 each.  So, they are not very expensive at all.  I think I will go ahead and order 8 of them and an IBM 2000 BB PSU.  I already have a breakout board.  I want to see how they do before I buy 16 of them.

By the way, could I simply reverse polarity on my hookup to the PCI-e cords to get the blades to rotate in the appropriate direction if I need to OR will I need to take the propeller off and reverse it?  It says they can be used as push or pull which has me believe reversing polarity may do the job.

[generalt]

Can you really hear them if they're quieter than the S7 or are they quieter but make more annoying higher pitch sounds?  I have a bid on a few to play with.

the 2980 psu's and the 2880 psu's sound nasty

as does the s-7

I can get the 2880's and the s-7 to sound okay.

I need to play with the 2980 more.

Are the S7 worse or the 2880?  I have two 2880's and they're just at my threshold limit.  I have yet to acquire any S7.  I was considering getting the 4k setup to lower the noise and possibly get a batch 9 S7 or two, but if the S7 will bring the noise level back up to the same as the 2880w PSU I may have to reconsider.

[dmwardjr]

Might consider this switch in that application as well:

http://www.amazon.com/Unique-Goods-Controller-Adjustable-Reversible/dp/B00RYRXFW2

EDIT:  Scratch that.  3 amps output and I would need 6.6 amps.

[dmwardjr]

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

[Prelude]

Dave,

I'm not sure about using those. What's the duty cycle on them? Car radiator fans don't run 100% of the time the car is on, and I don't think they're built for it.

Thanks for chiming in.  That's why I wanted opinions for this application.  I'm not sure on the duty cycle.  It sounds like I need to do some research.  

EDIT:  If you happen to know of a 12 inch fan with long duty cycle and low watts, please let me know.

Yep, don't want to end up with something that won't do the job and have to buy twice. Might end up having to use something 120/240v since a 100% duty cycle fan will probably tend to be AC in that format I imagine? Not sure though.

They are $29.99 each.  So, they are not very expensive at all.  I think I will go ahead and order 8 of them and an IBM 2000 BB PSU.  I already have a breakout board.  I want to see how they do before I buy 16 of them.

By the way, could I simply reverse polarity on my hookup to the PCI-e cords to get the blades to rotate in the appropriate direction if I need to OR will I need to take the propeller off and reverse it?  It says they can be used as push or pull which has me believe reversing polarity may do the job.

Quick google search about reversed polarity:

It depends on the exact type of DC motor.
 
If it's a modern DC motor, with an electronic controller, you can't, not without changing a strapping option onthe controller chip, sometimes not even then.
 
If it's a permanent magnet motor with a commutator, just reverse the polarity, although some such motors are not designed to be reversed and will work poorly or burn up the brushes.
 
If it's a DC motor with a stator winding, reversing the polarity will NOT reverse the direction of rotation, you have to reverse either the polarity going to the stator or to the brushes.

So, it may work that way.

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

Yes, it will power them just fine. 12V DC is 12V DC, the fan won't know what's supplying the power.

I don't know if this is something that needs to be considered, but genrally a charged car battery is about 12.8v and close to ~14.4v while the alternator is charging. The DPS2000 will be 12.25v unless you play with it. Shouldn't be an issue I imagine, just slightly different amperage.

[mavericklm]

Looks like 3 s7 batch 8 are a bit too much for this dual psu or am i mistaking?

[dmwardjr]

Dave,

I'm not sure about using those. What's the duty cycle on them? Car radiator fans don't run 100% of the time the car is on, and I don't think they're built for it.

Thanks for chiming in.  That's why I wanted opinions for this application.  I'm not sure on the duty cycle.  It sounds like I need to do some research.  

EDIT:  If you happen to know of a 12 inch fan with long duty cycle and low watts, please let me know.

Yep, don't want to end up with something that won't do the job and have to buy twice. Might end up having to use something 120/240v since a 100% duty cycle fan will probably tend to be AC in that format I imagine? Not sure though.

They are $29.99 each.  So, they are not very expensive at all.  I think I will go ahead and order 8 of them and an IBM 2000 BB PSU.  I already have a breakout board.  I want to see how they do before I buy 16 of them.

By the way, could I simply reverse polarity on my hookup to the PCI-e cords to get the blades to rotate in the appropriate direction if I need to OR will I need to take the propeller off and reverse it?  It says they can be used as push or pull which has me believe reversing polarity may do the job.

Quick google search about reversed polarity:

It depends on the exact type of DC motor.
 
If it's a modern DC motor, with an electronic controller, you can't, not without changing a strapping option onthe controller chip, sometimes not even then.
 
If it's a permanent magnet motor with a commutator, just reverse the polarity, although some such motors are not designed to be reversed and will work poorly or burn up the brushes.
 
If it's a DC motor with a stator winding, reversing the polarity will NOT reverse the direction of rotation, you have to reverse either the polarity going to the stator or to the brushes.

So, it may work that way.

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

Yes, it will power them just fine. 12V DC is 12V DC, the fan won't know what's supplying the power.

I don't know if this is something that needs to be considered, but genrally a charged car battery is about 12.8v and close to ~14.4v while the alternator is charging. The DPS2000 will be 12.25v unless you play with it. Shouldn't be an issue I imagine, just slightly different amperage.

WOW...

Thanks for the reply, Prelude.  Much appreciated.

I'm going to order only 2 of them and mount them behind one grille in the mining closet door to see how they do.  They may not have as much CFM as they state.  We'll see.

[nhando]

Looks like 3 s7 batch 8 are a bit too much for this dual psu or am i mistaking?

I'm powering 3 x S7 with my Dual IBM 2KW PSU using the 4K board right now  Should be fine as you have 4000W, even if you overclock, it's sufficient.


@Phillip, I got the Voltage changing board and the older Rev PSU.  How do I adjust the voltage on these boards?

[philipma1957]

Looks like 3 s7 batch 8 are a bit too much for this dual psu or am i mistaking?

yes but if you clock at freq 693 or 687 it should work.

I did 17 x 240 = 4080 watts  for 3 days . So I think you could do 3 s-7's at a littie under freq 700.

also many s-7's from your batch burned so a little underclock may be smart.

@ nhando  do you have a small switch on one corner of the board for

 power on power off.

   X----------
   l             l
   l             l
   l_______x <<<<<<<<< a second switch  3 positions near the fan connections

that switch near the fan connect has 3 positions check your gui volts on the avalon screen

are you 12.1 that is middle
move switch  and you will go to 12.4 that is high
if you went to wrong direction 11.8 that is low

[nhando]

Very cool.  I thought those switch are to individually power on and off each PSU just like when you have separate boards.  Didn't know 1 was for voltage changing.  I think Finksy should add that info in his thread.  Currently it's powering 3 x Batch 8 S7 running at 700M Freq and the Voltage displays shows 12.3 or close to that.  I will look at that spot in the morning as that spot is so crowded with the FAN and the power cables.  I can changing the Voltage while the PSU is powered on?  

[kilo17]

That is to much work--lol...Just turn the voltage dial on the PSU and be done with it- 

[kilo17]

The one on the right is the voltage adjustment and the one to the left is the amperage adjustment (I do not mess with that one -

Took off 6 screws to get the top off, cut off that piece with some snips, and back together all in less than 10 minutes.

[philipma1957]

Very cool.  I thought those switch are to individually power on and off each PSU just like when you have separate boards.  Didn't know 1 was for voltage changing.  I think Finksy should add that info in his thread.  Currently it's powering 3 x Batch 8 S7 running at 700M Freq and the Voltage displays shows 12.3 or close to that.  I will look at that spot in the morning as that spot is so crowded with the FAN and the power cables.  I can changing the Voltage while the PSU is powered on?  

I have changed it running the avalon6

And the power is on.

[kilo17]

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

It isn't an issue, I am running some fans from a 2000 the same way.  Just splice the power and ground into a PCIe connector and BAM

[nhando]

After seeing DMwardjr's Youtube video about respecting Electricity and that guy getting fried by high voltage, I have a fear of even touching power cords....  Haha.  Only tried and true for me, especially after Phillip did another 1 saying, open the PSU at your own risk,,,,,,,,,,,,,,,.DEAD Meat.  So I will only do what is considered tried, true, rinse, rather and repeat solution.  No wild cowboy moves for me.  Still have 2 kids to take care of.  =)  

P.S Thanks for the heads, up.  Going to the Garage now to fiddle w the Voltage thing.  


Update - The switch only have 2 position on my 4K board.  Maybe I have a bad unit?  Pulling it up shows 12.11V and pulling it down gets me 12.26-27.  There is nothing in the middle or any other settings. I even tried taking out the nut / washer to make sure it was causing it to be stuck.  Even tried pulling to the left and right.  No dice =( 

[J4bberwock]

After seeing DMwardjr's Youtube video about respecting Electricity and that guy getting fried by high voltage, I have a fear of even touching power cords....  Haha.  Only tried and true for me, especially after Phillip did another 1 saying, open the PSU at your own risk,,,,,,,,,,,,,,,.DEAD Meat.  So I will only do what is considered tried, true, rinse, rather and repeat solution.  No wild cowboy moves for me.  Still have 2 kids to take care of.  =)  

P.S Thanks for the heads, up.  Going to the Garage now to fiddle w the Voltage thing.  


Update - The switch only have 2 position on my 4K board.  Maybe I have a bad unit?  Pulling it up shows 12.11V and pulling it down gets me 12.26-27.  There is nothing in the middle or any other settings. I even tried taking out the nut / washer to make sure it was causing it to be stuck.  Even tried pulling to the left and right.  No dice =( 

trim the potentiometer to the right to add some offset to voltage adjust.
switch in low position is overvolt, high position is undervolt.
middle position do nothing when you have it.
Finksy probably delivers the board with potentiometer set to a minimal offset to avoid trouble.
I'm delivering them set in medium position to get more offset (+/- 0.4V)

[nhando]

What do you mean trim it?  Remove the switch and cut something?  or remove the switch adjust it like Kilo's example?

[philipma1957]

What do you mean trim it?  Remove the switch and cut something?  or remove the switch adjust it like Kilo's example?

trim pot is a little screw   turning it is trimming it.

the board has a trim pot


 Power on off>      S_________M < volts meter
                            l                 l
                            l                 l
                            l                 l
Trim- pot >  >      T_________S <  volts up or down


on trim pot       think of it like a clock face :

    turn  clockwise for higher volts

counter clockwise for lower volts        

turn it say     l to  -             as mine is a flat blade  

so the example I give is 90 degree turn clockwise from  12 noon  to 3  o'clock        


here i am maxed  I set trim pot up and switch to high  I am at 12.83 volts

I am running at nicehash and being paid .0051 a th



        

[nhando]

You are the MAN Phillip.  Pictures are worth a thousand words as they say.  I thought that was just a screw, didn't even know it's a Trimming / adjustable thing.  WOOHOO.  12.55V now.  Will connect the Avalon to this Board later this week.  Right now it's busy warming up the house.  Yes, I just starting doing the NiceHash casino on Kano pool.  It's paying off for me with the current luck while I work on finishing up the 400AMP upgrade.  


Update - Now that I'm over volting it to give it more juice, they seem to react much better to the 731M frequency then when at just 12-12.2V.  Testing this for a few hours and see how stable this is as I'm surely over stressing my 2x2KW PSU at this load.