as of today 6/22, how can I build a 500+Mhash/s rig using product in stock @ ama

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as of today 6/22, how does one build a 500+Mhash/sec rig using products in stock @ amazon?
looks like the HD 6870 is in stock, what motherboard goes well w/ doing 2x6870 crossfire (and is in stock at amazon)?

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[muscles]

This would be a really good video card to use: http://amzn.to/jl4NvP

[minor_miner]

You don't need crossfire for mining (but for gaming, though).

Confirming that the 6870 does 260 MHash/s with stock rates (m0mchil's miner, -v -w 128 -f 1)

[nandnor]

>Good, however used computer farms can be cheap. I recommend considering FPGA based solutions.

[orjoguy]

You'll get above 500MH/s with HD5850s. I am using just a single XFX HD5850 (it plays games as well!) and I get just over 300MH/s average when the computer is running and left alone. There is a company in Florida with a couple of XFX HD5850 second hand on Amazon for around $190 each which is about equivalent to what I paid for a repack XFX HD5850 here in the UK.

Is anyone farming with an array of Playstations yet!???

orjoguy

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You don't need crossfire for mining (but for gaming, though).

Confirming that the 6870 does 260 MHash/s with stock rates (m0mchil's miner, -v -w 128 -f 1)

what if i want 2x6870?
what mobo is cheap and decent quality for supporting crossfire?