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From a previous business, I have 5 Dell Poweredge 2850 Servers, each with 2 Intel Xeon 3.4 Ghz processors. I also have 2 2950s, a huge 7150, and few other smaller 1 U Dell servers. All but 2 of those machines are just sitting there in the rack and not even turned on right now. I have seen CPU miners and know that these are not optimal, but have considering making 5 mining servers out of the 2850s to just see what happens. My power bill increases around $400 a month when running all of these servers/switches/UPS/Firewall/etc. (more in the summer than winter of course). I have all the infrastructure and hardware to setup these machines, but I cant seem to find any data on potential earnings with Xeon processors to see if it would be worth my time or the extra power to build miners out of these machines. I understand that with the difficulty going up the earning will continue to decrease, but if anyone could provide some rough potential numbers or suggestions for further research, it would be appreciated.

CPU and GPU mining has been outdated by ASIC mining. There isnt much you can do with Bitcoin perse with that hardware besides vanitygen.

I would be very surprised if you manage to mine more than 0.5 BTC/month with those.

You can use those to mine primecoin right now.

If you could get recent GPUs (Radeon HD 6850 or newer) for very, very cheap, youmightbe able to make a couple of Bitcoin per month. It may not be worth it, depending your electricity costs.

Use these tools to help guide you to an informed decision:

P3 Kill A Wattpower meter, to find your actual power consumption

Mining hardware comparison, to find a GPU that will work in your system and plug its hashrate into…

Mining profitability calculator, to calculate what your break even or profit point will be.

vanitygenis probably your best bet given the equipment that you already have.

Two or three years ago, yes, you mightve mined some BitCoins with this equipment.

Now its all obsolete, compared with ASIC-based equipment that outclasses it by 3 or 4 orders of magnitude in hash-specific processing power.

You could run all your current equipment for a month and probably not even mine a single coin.

I would try running SCRYPT based miners. I have 3 poweredge servers to set up and thats my take for now.

Can you expand this at all to indicate what the asker should expect as far as performance goes?

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