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Akitio Thunder2/3 Power Draw Help / Dell DA-2 switching  

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vava726
(@vava726)
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Joined: 5 years ago
 

http://pinoutguide.com/Power/dell_usff_power_pinout.shtml

pin 5 of this schema. 

sense is the equivalent of green cable in atx.  Sense and remote pilot the power on process. 

  5 is remote and 1 is sense

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23mrtbone
(@23mrtbone)
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Joined: 5 years ago
 
Posted by: vava726

 

http://pinoutguide.com/Power/dell_usff_power_pinout.shtml

pin 5 of this schema. 

sense is the equivalent of green cable in atx.  Sense and remote pilot the power on process. 

  5 is remote and 1 is sense

   

Okay, I think our terminology got swapped around somewhere. Based on @Yukikaze and my above discussion, we've been using the sense pin to describe pin 5 in your picture as noted by the "blue pin" marked in the image from this thread:  https://egpu.io/forums/builds/2013-15-mbpr-iris-only-gtx106016gbps-tb2-akitio-thunder2-win10-internal-display-optimus-enjoy/ (which is this image:  ).

 

So as long as the "blue pin" or "pin-5" or "remote pin in your terms" is connected to one of the three ground pins, then the system will kick on. Knowing that, what is "pin 1" for, or the "sense pin in your terms"? 

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vava726
(@vava726)
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Dell DA2 Sense

According to my opinion and to the information provided above and pinoutguide.com the right nomenclature is this one where your blue pin is the "remote" one.

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23mrtbone
(@23mrtbone)
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Joined: 5 years ago
 

@vava726 Hey, all sounds good to me! So, what is the "Sense Pin (pin-1)" for then?

I mean, What is the function of the Sense Pin? Is it used or can it be used for something?

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vava726
(@vava726)
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Joined: 5 years ago
 

Power Supply "Remote Sense" 

 

Most medium to high power AC-DC power supplies and some DC-DC converters include "Remote Sense" connection points (+ and - Sense) that are used to tightly regulate the supply's output voltage at the load. Since the output cables that connect a power supply's output to its load have some resistance, as current flow increases, so will the voltage drop across the cables (I x R = Voltage Drop). Moreover, since it's best to regulate the voltage directly at the load, the use of the two Remote Sense wires connected from the supply to the load will compensate for these unwanted voltage drops. Refer to Fig. 1 which shows the typical connections when the Remote Sense function is used.

Fig. 1: Power Supply with Twisted "Remote Sense" Wires Connected to the Load
 
In these case the load (for the sensing) is the pci-e to thunderbolt card of the akitio,  on the nameplate of DA-2 the sense of negative polarity is named remote (5) and the positive one pin is named sense (1) when the load is connected to the thunderbolt of the pc   the psu is turned on.
 
If you use a switch (connecting 1-5) to turn on your psu, it looses any feedback for voltage regulation... it's not a big problem but it isn't the best way to connect the psu to the load.
 
Bizon that rebrands akitio thunder 3 has adopted the solution I propose to power its Bizon 3. 
 
 

bbox2
boxrear
 

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23mrtbone
(@23mrtbone)
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Now that makes more sense why you suggested connecting the sense pin to that particular pin on the pci-e to the thunderbolt card! 

 

Thanks for all the info! 

 

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Barts
(@barts)
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Joined: 5 years ago
 

Hi guys I was wondering if it would be ok to connect asus dual rx 480 8gb (8pin) with 6pin 

I got akitio thunder 2, graphic card that i mentioned above dell da-2 and 6 pin splitter

thanks 

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Yukikaze
(@yukikaze)
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Joined: 5 years ago
Builds: 24
 

It should be fine if you use a 6-pin to 8-pin adapter from one side of the splitter and you do not run long cable runs (over 2ft). The standard 18AWG wiring most splitters come with should have no problem carrying 50W per 12v line (6-pin has three, and 8-pins are rated for 150W). The only thing to keep in mind is that some RX480 cards can be overclocked heavily by BIOS voltage increases. In such a case your 220W power brick might not cut it. You might want to take a look at reviews for the specific card to see its power consumption. If you don't provide it with enough power, you will end up with crashes under load.

Want to output 4K@60Hz out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).

"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."

 
2012 Mac Mini [3rd,4C,Q] + RX 480 @ 10Gbps-TB1 (Atto Thunderlink) + macOS 10.15.7 [build link]  


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Barts
(@barts)
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Joined: 5 years ago
 
Posted by: Yukikaze

 

It should be fine if you use a 6-pin to 8-pin adapter from one side of the splitter and you do not run long cable runs (over 2ft). The standard 18AWG wiring most splitters come with should have no problem carrying 50W per 12v line (6-pin has three, and 8-pins are rated for 150W). The only thing to keep in mind is that some RX480 cards can be overclocked heavily by BIOS voltage increases. In such a case your 220W power brick might not cut it. You might want to take a look at reviews for the specific card to see its power consumption. If you don't provide it with enough power, you will end up with crashes under load.

   

Thanks for the answer and yeah, you was right, my system was crashing under load so I had to underclock my gpu but that was just delaying the crash at the end.

So I bought new psu ATX 500B which is 500 watt and I thought it will be overkill for small akitio and rx 480

It doesn't have 8 or even 6 pin so I bought 2 molex to 8 pin converter but since that's on the way I thought I might try to plug it in differently

What I did was removing all the pin from my 6 to 8 pin adapter to get 8 pin plastic plug

Then I removed 2 yellow and 5 black cables from 24 pin in my psu, plugged them in into 8 pin end, also took another 12v yellow cable from molex, soldered cable with the pin at the end and plugged it in so I got 3 12v cables and 5 grounds

I also snapped the 4 pin end on my psu and made barrel plug from it (2 yellows, 2 black)

and voila!

still got crashes...

without any underclocking it even crash straight away under heavy load   

is it another shitty psu that I got or something else?

I was also thinking that, cause rx 480 had problems with drawing too much power from the pcie port, that might be also the problem but I don't know

apparently they sorted that out in the drivers but I think I might still spike over 75watts from pcie and I don't know if akitio would like that

I really appreciate any advice and thanks so much for any help !  

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Barts
(@barts)
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Joined: 5 years ago
 

Right so I thought that atx 500b is just shitty psu and 500w is just peak-rated performance so I swapped today for evga 430w 80 plus and it still crashes my system, holds much better on manufacturer settings (1305mhz) but eventually it will crash

I'm getting tired of it cause it can't draw that much power? there is huge difference in wattage between dell da 2 and evga 430w

can anyone please tell me what else I can do?

 

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