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If you had a free power source and took it out of the equation, what would be potentially the best option for bitcoin mining?
You have limited space, so for about one or two computers tops. What hardware would you choose ultimately based on the basis it's available today?
e.g. Can top end graphics cards still be as good as a FPGA setup?
Can FPGA's out do ASIC in the aspect that the hardware is cheaper/ more accessible? or is it still not worth while in comparison?
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At time of writing it still possible to run a GPU farm but at the speed of the increase in difficulty this will not last for long.
The second presumption with this is that you are not paying for the hardware, its very unlikely you would even break even if you had to purchase hardware at this time. The only real option in a competitive market is to go down the ASIC route.
Performance in a good quality ASIC can be 100 x that of a top end GPU. The price tag could realistically be about the same. There is zero comparison.
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If power cost is not a concern, your ROI calculation is simplified to just Hash/$
You can refer to the Mining Hardware Comparison page for some numbers.
So to answer your question, yes, GPU can be a viable option if power cost is not a concern (including all the heat generated in the room).
Yeah, from what I understand there's a very big wait on any of the Butterfly Lab hardware even the low end stuff right? – Peter Fox – 2013-03-27T14:36:32.510
I wouldn't say that's totally true, I paid out for 2 second hand graphics cards (AMD 6950) and made even in a month or 2, admitantly I still had a motherboard, PSU and Case that was suited to work but breaking even is still easy enough, but yeah, I can see that the market is definitely hotting up, even in the last 2 months – Peter Fox – 2013-04-10T11:06:46.920
Not sure what you mean I said its still possible, just not for long :) – MaxSan – 2013-04-10T13:11:00.977