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Author Topic: USB 300MH/S ASICMiner Value Question  (Read 8272 times)
firefop
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June 09, 2013, 07:06:12 PM
 #61

To chime in on the original question. The value if you're adding to an existing mining operation (or attempting to build a new one) is negative. If they could be purchased for 0.5 btc that would be much much better, but still not 'good'.

If you're buying them to replace existing gpus that are currently hashing, then they do actually have positive value in the sense of them reducing your electric consumption. Assuming you replaced some gh/s you'd hit roi in only a few months just on the power savings.

However, ~2btc each they'll take almost 2 years to earn back the btc you'd spend on them... and that's a best case scenario.


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June 15, 2013, 05:28:21 AM
 #62

I floated the idea on the Mojo board forums (uses Spartan-6 XC6SLX9)
http://forum.embeddedmicro.com/viewtopic.php?f=3&t=68
...
Edit : lol hadn't looked at https://github.com/kramble/DE0-Nano-BitCoin-Miner/tree/master/Xilinx_LX9_hashers_6 yet...

OK, I've created an account on the Mojo board to give some support on this as its rather OT here. Discussion on bitcointalk probably belongs on https://bitcointalk.org/index.php?topic=9047.0

Mark

A good job kramble your port to LX9 for other developer boards. Can you create a new folder in your git project for Mojo? with a base that we can contribute.

The first task we could do is to use the usb port and avr_interface library to communicate, how do you see?

NOTE: a small board (Mojo) that can serve to mine, right?

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June 16, 2013, 08:57:43 AM
 #63


A good job kramble your port to LX9 for other developer boards. Can you create a new folder in your git project for Mojo? with a base that we can contribute.

The first task we could do is to use the usb port and avr_interface library to communicate, how do you see?

OK, its up now at https://github.com/kramble/DE0-Nano-BitCoin-Miner/tree/master/Mojo_LX9

The README should be pretty explanatory. I was unable to build the six hasher variant as PAR did not complete (overnight). It ought to fit (my homebrew Xilinx_LX9 is essentially the same code), so I need to investigate FPGA Editor to see if I can tweak the placement. So the current version is configured for three hashers (config is near the top of fpgaminer_top.v) and 50MHz. I'm using a PLL so device frequency is also configurable (if you get it working at 50MHz, try running it faster, best to use 10MHz increments to avoid weird divider ratios).

I won't be able to test it myself as I don't have a Mojo board, but I will do a port to run it on my homebrew LX9 later today (ie keeping the mojo serial code). The python mining code does work though, just be sure to set the correct COM port at the top of the file. For python neophytes, beware changing any whitespace, as space is syntax in python  Roll Eyes

BTW This is mostly fpgaminer, makomk and technohog's code, so thanks are due to them. I just tweaked it a bit.

Quote
NOTE: a small board (Mojo) that can serve to mine, right?

Yes, but only at a few MHash/sec ... dust! You'll probably never reach the pool's minimum payout at that rate!

Github https://github.com/kramble BLC BkRaMaRkw3NeyzsZ2zUgXsNLogVVkQ1iPV
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