sidehack (OP)
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Curmudgeonly hardware guy
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January 23, 2014, 05:23:34 PM |
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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
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RickJamesBTC
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January 23, 2014, 06:17:49 PM |
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Yeah that's what I was thinking. Oh well, I guess I saved enough on power supplies to spend a little on fans...
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_r2h
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January 24, 2014, 05:14:49 AM |
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How many amps are those screw terminals rated to carry? The whole 4 terminal assembly that is.
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sidehack (OP)
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January 24, 2014, 05:38:24 AM |
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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.
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_r2h
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January 24, 2014, 05:58:58 AM |
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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.
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sidehack (OP)
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January 24, 2014, 06:01:03 AM |
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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.
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_r2h
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January 24, 2014, 06:07:13 AM |
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Not a sparky like the rest of my family, why I asked.
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RickJamesBTC
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January 24, 2014, 06:09:09 AM |
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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.
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bitpop
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January 24, 2014, 08:01:27 AM |
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RickJamesBTC
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January 24, 2014, 08:03:07 AM |
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Lol, I have SO MUCH 0 gauge cable and terminals around here.... I've been doing big car stereos for a long time.
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bitpop
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January 24, 2014, 08:05:05 AM |
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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
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RickJamesBTC
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January 24, 2014, 11:02:23 AM |
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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!
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BotwinBG
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January 24, 2014, 11:12:12 AM |
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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!
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| │ | | AMEPAY LISTING
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RickJamesBTC
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January 24, 2014, 11:25:46 AM |
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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.
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mikep2012
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January 24, 2014, 12:17:41 PM |
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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,
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RickJamesBTC
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January 24, 2014, 06:46:26 PM |
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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!
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_r2h
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January 24, 2014, 09:31:57 PM |
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Looks similar to what I have planned. 10awg to some pcie pigtails with 16awg on them.
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klondike_bar
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ASIC Wannabe
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January 24, 2014, 10:55:30 PM |
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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
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freddyfarnsworth
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January 25, 2014, 02:03:49 AM |
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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 ?
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BTC: 1F1X9dN2PRortYaDkq89YJDbQ72i3F5N3h MEOW: KAbvy9jrrajvN5WLo7RWBsYqYfJKyN9WLf DOGE: DAyKSrTiVeRZaReTu1Cyf5Je6qPdKTuKKE
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RickJamesBTC
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January 25, 2014, 02:21:40 AM |
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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%.
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