Server Power Supply Interface Board - for standalone miners and GPU rigs

[sidehack]

We've still got to iron out the assembly time and associated labor cost, but we're looking at between $35 and $42.50 depending on quantity.

Availability will depend on how long it takes to manufacture, but we're looking at stocking 18" 16AWG cables, spade on one end and PCIe 6-pin on the other. Hopefully no more than $4 per cable.

http://www.gekkoscience.com/products/server_supply_breakout_board.html

[RickJamesBTC]

Not worried about loud, and I don't want to have to stack even more power supplies. I'm just finding that fans zip tied to the cases isn't providing sufficient cooling. I guess I'll need to get some much more powerful fans and maybe make some ducting to ensure the airflow all works as it needs.

If you cant hear em they are wrong ones. need 12v 2 or 3 amp 3800-4000+ rpm fans push 140cfm or so.
120x120x25 or x38 but they are thick, would only need one or two of those - as original design pulled outside air from case thru the PS to exit.
They had xeon passive sinks on the CPUS so it was pre warmed air, with ALOT of flow.

Here some links to get you goin - I would use even heavier for this application on the 2000watt jobbers


AFB1212SH
http://www.ebay.com/itm/Gateway-960-8006323-Delta-AFB1212SH-Back-Case-Chassis-Fan-30-Day-Warranty-/170822936596?pt=US_Computer_Case_Fans&hash=item27c5d72814

http://www.ebay.com/itm/Gateway-Delta-AFB1212SH-Back-Case-Chassis-Fan-/281046185168?pt=US_Server_Fans_Cooling_Systems&hash=item416fa874d0

Yeah that's what I was thinking. Oh well, I guess I saved enough on power supplies to spend a little on fans...

[_r2h]

How many amps are those screw terminals rated to carry? The whole 4 terminal assembly that is.

[sidehack]

They're made for 10 and 12AWG wire, 20 amp rated. We've got the underside beefed with copper for current handling. Didn't seem to have any issues pushing 60A through them yesterday.

[_r2h]

Do you happen to know at what voltage?  Like this block, 25A at 300v.  If converted to Amps at 12v, you get ~600.  Plenty for even the big DPS 2ks, even fits them nicely 4x12v, 4xGround.  I worry about attempting to pull 162 through that though.  Sadly not an engineer like my dad, went health care instead, so google is my friend in these cases.

[sidehack]

I don't really think it works like that. For the power rating on a fixed resistance (like a screw terminal lead would be), amps is amps no matter the voltage.

[_r2h]

 

Not a sparky like the rest of my family, why I asked.

[RickJamesBTC]

Correct, current capacity is a function of resistance and voltage loss. You draw 300 amps at 12V, that's about 3600 watts of power. You draw 300 amps at 240V that's 72000 watts, yet both can be carried through the same appropriately sized wire.

Often a voltage rating of a conductor or fuse relates to arc suppression. A very high voltage applied to a low voltage component may be able to leap the gap between conductors or if a fuse blows, it may still arc.

[bitpop]

I'm sticking to 12v products
http://www.sonicelectronix.com/item_15889_StreetWires-DBX30.html

[RickJamesBTC]

I'm sticking to 12v products
http://www.sonicelectronix.com/item_15889_StreetWires-DBX30.html

Lol, I have SO MUCH 0 gauge cable and terminals around here.... I've been doing big car stereos for a long time.

[bitpop]

I'm sticking to 12v products
http://www.sonicelectronix.com/item_15889_StreetWires-DBX30.html

I need some cable

Lol, I have SO MUCH 0 gauge cable and terminals around here.... I've been doing big car stereos for a long time.

I need some cable

Are they lying to us? Or is that stuff really needed?

http://www.sonicelectronix.com/item_46861_NVX-XW0BL50.html

[RickJamesBTC]

I'm sticking to 12v products
http://www.sonicelectronix.com/item_15889_StreetWires-DBX30.html

I need some cable

Lol, I have SO MUCH 0 gauge cable and terminals around here.... I've been doing big car stereos for a long time.

I need some cable

Are they lying to us? Or is that stuff really needed?

http://www.sonicelectronix.com/item_46861_NVX-XW0BL50.html

I use it all the time, it's not that expensive compared to 4ga, and gives you plenty of room to play.

Note to the server power supply crowd. My power cables that I've posted before are running a little warm, and my calculations should have been fine. I've got top of the line gxl 12ga  2' long cables running to each pair of R9-280x cards. They have about 45 amps running through them according to my amp clamp, and that shouldn't be enough to warm up the cables as much as it does. If you are making them similar to mine, you should switch that up to 10ga per pair. I'm going to make new ones for my 280 rigs and move these to my next 270 setups.

I spent some time today taping up the fans on each pair of power supplies, now they are sealed to the units and I'm not overheating anymore. Crisis averted I hope!

[BotwinBG]

I'm sticking to 12v products
http://www.sonicelectronix.com/item_15889_StreetWires-DBX30.html

I need some cable

Lol, I have SO MUCH 0 gauge cable and terminals around here.... I've been doing big car stereos for a long time.

I need some cable

Are they lying to us? Or is that stuff really needed?

http://www.sonicelectronix.com/item_46861_NVX-XW0BL50.html

I use it all the time, it's not that expensive compared to 4ga, and gives you plenty of room to play.

Note to the server power supply crowd. My power cables that I've posted before are running a little warm, and my calculations should have been fine. I've got top of the line gxl 12ga  2' long cables running to each pair of R9-280x cards. They have about 45 amps running through them according to my amp clamp, and that shouldn't be enough to warm up the cables as much as it does. If you are making them similar to mine, you should switch that up to 10ga per pair. I'm going to make new ones for my 280 rigs and move these to my next 270 setups.

I spent some time today taping up the fans on each pair of power supplies, now they are sealed to the units and I'm not overheating anymore. Crisis averted I hope!

You gotta share your work of art with the rest of us, take pictures!

[RickJamesBTC]

That's a few pieces of it. They are all working well, I was just a little concerned that the cables to the 280s were hot to the touch. None of them are hot enough to cause a problem though, so it will be ok till I remake them.

[mikep2012]

RickJamesBTC, can you post more photos - maybe in some online album, looks like a nice setup and i'm curious about the wiring.
thank you,

[RickJamesBTC]

There isn't much more to it than that, and I already posted it in this thread somewhere. It's a big mess if you can see it clearly, let me live my lie!

[_r2h]

Looks similar to what I have planned.  10awg to some pcie pigtails with 16awg on them.

[klondike_bar]

Finally found some information on how to turn on the HP Common Slot Power Supplies:

http://www.rchelination.com/setting-hp-dps-1200fb-power-supply/

Still looking for a connector though.

Here are few more details (Pin37 has 12V standby power and Pin30 is a ground):


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

would a DPS-800GB A have the same method for powering on? Its the same style of connector.
ps: shorting pin 34 to the pin opposite it on the blade causes the fans to come on. I havent tested the voltage of it though since i lack a second set of hands/aligator clips

[freddyfarnsworth]

There isn't much more to it than that, and I already posted it in this thread somewhere. It's a big mess if you can see it clearly, let me live my lie!

Just a thought. if regular MB supplies xx amps to the GPU (usually max design is 3 very rare 4 GPU slots), were not the PCIE aux 6-8 pin headers added as a afterthought when big cards started coming out.

So can you bump the bottom supply current so the pcie headers do not have to work so hard ?

[RickJamesBTC]

There isn't much more to it than that, and I already posted it in this thread somewhere. It's a big mess if you can see it clearly, let me live my lie!

Just a thought. if regular MB supplies xx amps to the GPU (usually max design is 3 very rare 4 GPU slots), were not the PCIE aux 6-8 pin headers added as a afterthought when big cards started coming out.

So can you bump the bottom supply current so the pcie headers do not have to work so hard ?

No, and you can't control where current goes. The cards demand a certain amount from each incoming power wire. Using my risers, I have the pci-e plugs AND the +12v line from the riser card powered by the server PSU. I pair the grounds up to keep them in sync, and connect the +5V line from the risers to a molex connector on the controlling computer. That lets them control card restarts properly. I had them all ganged up using a single 5v line, but whenever something goes wrong the motherboard tries to reset the cards and if the 5v line isn't connected to that mobo, the cards won't reset 100%.