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Author Topic: Multiple computers - Worth it?  (Read 1438 times)
IzorkX
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May 03, 2011, 03:31:07 PM
 #1

Hey.


I'm thinking about a little mining project.


I thought of running around 2 comps at first, and upgrading from there on.

Setup:

2x 5870 / 5850 since they generate a lot of MH/s and are really cheap.
Gigabyte GA-PH67-UD3, Socket-1155 (Cheapest SB board that supports CF)
Intel Core™ i3 Dual Core i3-2100T
Cooler Master GX 550W PSU
Random cheapest case and random cheapest memory.


- Will this give profit in the end? They will run 24/7.

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burtyb
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May 03, 2011, 04:53:10 PM
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That depends on other things like the cost of electricity/hardware, luck, difficulty, exchange rate/cost and most important the length of the string.

http://lorelei.kaverit.org/cgi/calc.py will help give an idea of the running costs/possible gains.

Meni Rosenfeld
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May 03, 2011, 08:00:10 PM
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Consider getting a 80+ Gold PSU, maybe a 650W one.
Consider getting an older, cheaper MB+CPU.
You can cheap out on the case, but make sure the cards have sufficient cooling, and that the cards actually fit. I don't know if generic junk will do.
And if you can get some 5970, consider getting one 2x5970 rather than two 2x5870. That might be slightly more expensive, but more power efficient and require less work. For this you should use a 850W 80+ Gold PSU.

To prevent possible confusion - you want the MB to "support CF" in having two PCI-e x16 slots (even that isn't strictly necessary), but you don't want to enable crossfire.

The jury is out on whether this is expected to be profitable. If you consider it a fun project and want to strengthen the network then go ahead.

What OS do you intend to use? Linux has some advantages in this regard, but being a Linux newbie and having built a Linux mining rig, it seems to me it is very difficult to use without 3 years of intensive training.

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c-rock
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I love the Cloud, and Love Mining, how 2 combine?


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May 05, 2011, 03:08:16 AM
 #4

your going to need a bigger power supply. 


I tried to run 5870s on a 650 watt. Burned out in a hr.

I went with a 900 watt from best buy.  That held up.

c-rock

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May 05, 2011, 03:44:07 AM
 #5

your going to need a bigger power supply. 


I tried to run 5870s on a 650 watt. Burned out in a hr.

I went with a 900 watt from best buy.  That held up.

c-rock

Are you sure you used a real PSU and not something generic? What PSU was it?

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BitPorium
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May 05, 2011, 03:56:55 AM
 #6

your going to need a bigger power supply. 


I tried to run 5870s on a 650 watt. Burned out in a hr.

I went with a 900 watt from best buy.  That held up.

c-rock

sounds like you had a bad psu. My 700w can hold dual single gpu anythings. 900w should be enough for quad gpu/
gigabytecoin
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May 06, 2011, 07:55:55 PM
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your going to need a bigger power supply. 


I tried to run 5870s on a 650 watt. Burned out in a hr.

I went with a 900 watt from best buy.  That held up.

c-rock


5870s are 188 watts a piece using stock clocks.

You should easily fit 2x5870s (376 Watts) and even the largest CPU (145 Watts) and still have 130 watts left over for fans, hard drives, ram, etc...

If you used a 45Watt CPU you would have 230 watts left over.

Curious to know the brands of both your 5870s and your PSU c-rock..?
Jaime Frontero
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May 07, 2011, 06:25:06 AM
 #8

Hey.


I'm thinking about a little mining project.


I thought of running around 2 comps at first, and upgrading from there on.

Setup:

2x 5870 / 5850 since they generate a lot of MH/s and are really cheap.
Gigabyte GA-PH67-UD3, Socket-1155 (Cheapest SB board that supports CF)
Intel Core™ i3 Dual Core i3-2100T
Cooler Master GX 550W PSU
Random cheapest case and random cheapest memory.


- Will this give profit in the end? They will run 24/7.

firstly, if you're going to run AMD GPUs, you should consider AMD CPU and chipsets, rather than mixing AMD and Intel.  i hear they don't like each other.  think about it.

secondly, if this is a dedicated miner a single-core CPU is fine: like a Sempron 140.  45 Watts.  the CPU is irrelevant to mining.

thirdly, i agree generally that a 550W PSU is too low.  keep in mind that you may want to upgrade your GPUs someday.

lastly, don't forget the random fans...
Meni Rosenfeld
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May 07, 2011, 08:21:07 PM
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You should easily fit 2x5870s (376 Watts) and even the largest CPU (145 Watts) and still have 130 watts left over for fans, hard drives, ram, etc...

If you used a 45Watt CPU you would have 230 watts left over.
You don't want a PSU to run 24/7 on anything near full capacity. A 650W PSU for a 450W system is more reasonable.

firstly, if you're going to run AMD GPUs, you should consider AMD CPU and chipsets, rather than mixing AMD and Intel.  i hear they don't like each other.  think about it.
I'm fairly sure that's false. You still should consider an AMD CPU because they're cheaper.

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SgtSpike
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May 08, 2011, 09:09:03 PM
 #10

Check the first link in my sig.  It's a spreadsheet that should tell you exactly how much profit you'll be making with such a setup.  You'll need to know how much MH/s you can expect from the cards, and how much electricity the whole setup will use (don't use the PSU specs, or online "power calculators" - find some actual, real-world measurements of power draw).
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