# Used blade servers for mining

Has anyone tried buying some used blade servers for CPU mining ? Some of these are available for 6000 on eBay and I think with 32 CPUs and 400 threads it should be profitable for few months I suppose.

It would probably depend on the memory bandwidth and available memory per thread. Do you have that information?

\$6k? I donâ€™t think this would be profitable.

Suppose you get 20 sol/s per CPU, thatâ€™s 640 sols/s for 32 CPUs, which is 9.375 sols/s per dollar. Suppose each CPU is 50W (probably more though), thatâ€™s 2.5 watts per sol/s.

Now compare that to GPU mining. Suppose you put together a rig for \$1600 that has 6 RX480â€™s. Suppose you get 180 sol/s each RX480, thatâ€™s 1080 sols/s, which is 0.675 sol/s per dollar. This is 13.8 times less expensive than buying a 32 CPU blade server.

I may have a math error or logic error, but seems like GPU mining is still way cheaper.

#edit. haha I had typo. Correction : .16 sol per dollar and .675 sol per dollar. â€¦
Your math is off slightly but only due to the sol per dollar and dollar per solâ€¦: but still very excellent point!
If blade server is 640 sol for \$6,000, thenâ€¦
=\$0.106 per sol
If gpu rig is 1080 sol for \$1600, thenâ€¦
=\$0.675 per sol

Point being gpu rig is more efficient per dollar than server blade rig.

Dear Opâ€¦ 400 threads total for 32 CPU doesnâ€™t add up. This is 12.5 threads per CPUâ€¦? Is isnâ€™t linear. Must be typo?

It is HP c7000 with 16 blades, 32 CPUs each one with 6 cores and 12 threads. Total 384 threads. I saw Monero benchmarks showing 15000 Hash for similar systems on Monero.

There was discussion in the past about AWS instances and I am sure all of those instances are running on similar virtualization servers. If you can get one generation older server for 10% the cost, it will beat AWS pricing for sure. I am also thinking that it would also be profitable for the time being.

Of note, I tried Z Cash on Opteron 3280. It has 8 cores and gave about 30 sol/s per core.

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Each of these CPUs have 6 cores and with hyper threading 12 threads are possible. What I am not sure is, if each of those threads will generate 20 - 30 sol/s or if it is going to be less.

I ordered a bunch of servers from eBay and should have some results in a week. I will post the results once I get the data.

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Not a typo.

If it is Hexacore CPU, you get 384 ( 16* 2 *6 * 2) threads on 16 blades. If it is octa core CPUs, you can get 512 (16 * 2 * 8 * 2 )threads.

I just want to give reference to Monero benchmarks document for better idea on itâ€™s performance.

Look at the blade server at the very top on the CPU hash ranking.

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6000 / 640 = 9.4 /sol 1600 / 1080 = 1.5 /sol