WRONG!12V powers the processors and the fan is basically inconsequential where power draw goes.
5V powers USB UART, controller and all logic circuits and if you want, my 5V fan mod as well.
You cannot hash with only 12V or 5V seperately. Both voltages MUST be present in order to hash! PERIOD!
Yes you need a supplemental 5V power supply if you are going to run more than 1 seed from a standard USB port. PERIOD!
You need and can safely use 13.8VDC 'standard output voltage' from any 'good' working power supply.
If you are only mining with 1 seed, you can do so without supplemental power pretty safely I would assume. I haven't done it since I started out with 4 pods, and now have 6 modded pods running and soon will have more modded pods hashing away making me money 24/7
Cool!
Good luck!
sure check the schematic. the 12v powers the fan. only the fan the processors arent powered by 12v the 12v is also converted to 5v and 3.3v via chip u7 which are fed to the processors via other bits and pieces.
the 5v from usb is just for that the uart com link. nothing more it doesnt draw any power from usb - unless there is the wolfy fan mod.
Here, let's try this.
Plug in the 5V USB power alone and see if the seed will hash and produce shares. The answer WILL be NO!
Next, try 12V power without 5V USB power. Same result. The answer WILL be NO!
Then plug in your 12V power and 5V USB power and see if they will hash now. The answer WILL be YES!
You're either mistaken or confused. The 12V is needed for processing to occur. It also powers the fan, yes but the fan can be connected to 5V USB power with very little current draw i.e. 78mA nominal.
The 5V feeds power to the logic circuits that run the chips, not the actual switching side of the chips that do the calculations etc. 12V IS what powers that!
Also, think of it this way. Why else would we need 12V 20 to 30 AMP power supplies to feed power to just the fans?
Get it?
Okay, hope this straightens things out for you!
Whew!
No you miss understand me. im not disagreeing with the fact that both the usb and 12v need to be supplied. think there was a misunderstnading on both parts here. the 12v is needed for processoring, BUT not directly are 12v supplied to the processors. the 12v is converted to 5V. and powers everything. not 12v directly. wihtout the 12v fan they couldsve had a 5v supply - different internals- conversion of 12v to 5v increase the ampage on the line. maybe thats why they did it? i dont believe that the usb power line is used for processing power, or the logic circuits, that comes from 12v to 5v conversion.
Like i said check the schmatics. 12v is converted to 5v, feeds the fan and passes to a relay (J2) although dont see no realy on board?.
Seriously i wonder wihtout the fan, could we power it on 5V? remove the 12v 5v conversion - otherwise the 5v would be converted lower and probably wouldnt power anything then.
Okay, I get you. No biggie. I haven't studied the schematics in such great detail yet. But I do know there is no relay on the card. At least not on any of mine or my customers cards.
Still, the 5V USB power alone makes what ever is driving the LED's, run. I asked GridSeed if they indicate logic drive is active, they said yes, and they told me that I was correct about my guess about what the 12V rail and 5V rails power. Like you say, maybe we're just not communicating well today
I guess we're both right but saying it differently.
I don't know why they'd go to the trouble of reducing processing power to 5V, I mean that is going to pull more current and dissipate more heat hash for hash. I guess the processor chips are all 5V then. Oh well. No biggie. It's still powered by 12V
The fan just runs straight off 12V. We agree on that. But it can easily be powered by 5V as well. Much quieter and still does the job for Scrypt mining perfectly.
I'm working with someone on modding the blades now. So far a potential overclock up to 7.2MHs has been discovered but some of the driver components need to be beefed up before we can confirm stable long term operation. Pretty cool!