Main problem with Cryptocoin mining currently is...........

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Klee

Well-Known Member
Jun 2, 2016
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The reason is that mining cryptonight, XMR i.e. Monero, is that it usually works best with 2mb of cache per thread.

A 8 core, 16 w/hyperthreading, cpu with 20mb of L3 runs best on 10 cores, 20mb/2mb=10, so if you turn off some of the other cores you save power since they are not being utilized.
 

Marsh

Moderator
May 12, 2013
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Klee explain nicely in the previous thread.

Disabling 2 or 3 unused core does lower hashrate by 2-3% , but saving may be 10% power
Example E5-2660 v1 8 cores 20MB L3 cache, 10 threads per cpu : dual CPU with 6 active cores produced 861 H/s using 207w
dual CPU with 5 active cores produced 846 H/s using 191w.

I plug these numbers in the profit calculator
Mining Calculator Bitcoin, Ethereum, Litecoin, Dash and Monero

It actually shown 5 active cores is more profitable than 6 active cores with cost of electricity @ $0.28 per KW/h

Supermicro system only let me disable even number of cores ( i.e. 2,4,6 active cores ) , Intel system let me choose 1-8 cores.
In the case of Supermicro system, then I have no choice but using 6 active cores.
 

Klee

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Jun 2, 2016
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Also don't forget you can save electricity elsewhere in your house, I'm replacing regular 60w bulbs as they burnout with led's that use only 8 watts or so. I am also in the habit of turning off anything in the house that does not really need to be on. So my electricity use is only about $30-$40 more per month but the temps have been mild so far. Once summer kicks in and the a/c starts cranking I may rethink things.
 
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JazzFaucet

New Member
May 19, 2017
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@Klee, @Marsh Thanks to you both for the clarification. Having a look at the Intel ARK, it seems that there has never been a Xeon E5 CPU that gives you 2MB of L3 per thread, so you are always looking at having to disable cores - even on the newest V4 chips. I had a quick look at eBay and found several SuperMicro 4-node chassis with E5-2670s for sale, and then plugged the cost of the chassis into the calculator you linked, and the payback time was not encouraging. It looks like I will just have to be content with my 2khs for now.
 

Klee

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Jun 2, 2016
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@Klee, @Marsh Thanks to you both for the clarification. Having a look at the Intel ARK, it seems that there has never been a Xeon E5 CPU that gives you 2MB of L3 per thread, so you are always looking at having to disable cores - even on the newest V4 chips. I had a quick look at eBay and found several SuperMicro 4-node chassis with E5-2670s for sale, and then plugged the cost of the chassis into the calculator you linked, and the payback time was not encouraging. It looks like I will just have to be content with my 2khs for now.

Take a look at my Open Compute build.

Dedicated Crypto Mining Open Compute server build.
Final prices and setup and performance.

2x Wiwynn open compute server $380.00 NEW *
4x E5-2660 V1 cpu’s $207.92 (best price found but the seller only had 4) USED
4x E5-2660 V1 cpu’s $230.80 USED
8 Gb of DDR 8500 8x1 Gb sticks $17.50 USED
4x used hard drives that I already had $00.00 USED
1x New HP PDU $10.00 NEW*
2x Power cords to reach unused 250V a/c outlet $20.00 NEW
*not including shipping

Total $866.22 gives 3480 H/s

I did not include the prices of the video card or pci-e usb card that were installed to install Ubuntu Server 17.04, the video card was an old Dell oem nvidia that came out of a free pc, the usb card was borroed from my main pc.

To mine XMR that come out to about $1000.00 less than a dedicated 5 GPU rig using RX580 4 gig card with slightly higher performance.

I went with new open compute servers, you could save another $100.00 buy going with two used Quanta open computer servers, I hate buying used motherboards and was willing to spend a little more.
 
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pgh5278

Active Member
Oct 25, 2012
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Australia
Here in Australia peak charges are $0.35 Kwh and they pay $0.06 Kwh for your excess. It's a rip off!
Boddy, dont You mean in Victoria, Last time I looked and lived there, it was a small state with great coffee and food, but could hardly be called Australia...:).

You guys are getting ripped and feed a line of tripe by the tree huggers,,is you .35 AUD or USD, my peak in Queensland is 0.235AUD or ~ 0.18USD..
 
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Boddy

Active Member
Oct 25, 2014
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Ah yes @ pgh5275 I should be more specific regarding state and my prices are AUD.
The point I was making was that sometimes the return on exporting electricity to the grid may be significantly less that cost to import.
I can't wait till price of batteries drop and the electricity providers get a kick in the rear end.
(Sorry to derail the thread.)
 
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Boddy

Active Member
Oct 25, 2014
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@Klee I too have switched to 10 watt LEDs (cool white seems to be brighter than warm white) they are priced around the same as compact fluorescence these days, with half the watts.
My TVs are small 32 inch LED & LCD that use 100 & 150 watts each.
For cooling I use evaporative (water) ducted air conditioning that uses less than 100 watts, but uses water too.
My appliances are energy efficient, especially refrigerators, heating is gas.
Always best to minimise energy usage (so you can run 8 GPU mining rigs like Patrick has. (Jealousy) :)
 
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Klee

Well-Known Member
Jun 2, 2016
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@JazzFaucet I disagree. I am writing this on E5 V3's with 8 cores/ 16 threads and 35MB L3 cache each.
There is also a low end 4 0r 6 core Xeon without hyperthreading that has more cache than is optimal mining Monero.

I don't remember which one tho.
 

pyro_

Active Member
Oct 4, 2013
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There is also a low end 4 0r 6 core Xeon without hyperthreading that has more cache than is optimal mining Monero.

I don't remember which one tho.
The 1603/1607 are quad cores without hyper threading with 10mb cache and run at 2.8 and 3.1ghz respectively
 

Patrick

Administrator
Staff member
Dec 21, 2010
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The 1603/1607 are quad cores without hyper threading with 10mb cache and run at 2.8 and 3.1ghz respectively
Yea but by the time you end up spending money on a motherboard/ system and the power for fans it is less exciting to use this type of chip.
 

pyro_

Active Member
Oct 4, 2013
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agreed i was more just replying to Klee who could not remember which chip it was. Though i might just try mining on one of these for the hell of it since i have a system with one laying around here doing nothing right now
 

Son of Homer

Member
May 9, 2016
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Take a look at my Open Compute build.

Dedicated Crypto Mining Open Compute server build.
Final prices and setup and performance.

2x Wiwynn open compute server $380.00 NEW *
4x E5-2660 V1 cpu’s $207.92 (best price found but the seller only had 4) USED
4x E5-2660 V1 cpu’s $230.80 USED
8 Gb of DDR 8500 8x1 Gb sticks $17.50 USED
4x used hard drives that I already had $00.00 USED
1x New HP PDU $10.00 NEW*
2x Power cords to reach unused 250V a/c outlet $20.00 NEW
*not including shipping

Total $866.22 gives 3480 H/s

I did not include the prices of the video card or pci-e usb card that were installed to install Ubuntu Server 17.04, the video card was an old Dell oem nvidia that came out of a free pc, the usb card was borroed from my main pc.

To mine XMR that come out to about $1000.00 less than a dedicated 5 GPU rig using RX580 4 gig card with slightly higher performance.

I went with new open compute servers, you could save another $100.00 buy going with two used Quanta open computer servers, I hate buying used motherboards and was willing to spend a little more.
Can anyone give me an idea of the expected hash rate on an Intel server with 2 E5-2670 V1 and 128GB DDR3 RAM? Also expected power consumption.
 
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poutnik

Member
Apr 3, 2013
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2x E5-2660 V1 -> approx 840H/s (xmr-stak-cpu), drawing ~190-210W with 64GB DDR3 RAM in 8 sticks... The power consuption depends also on the amount of fans turning and their speed, ie. on ambient temperature.
 

Marsh

Moderator
May 12, 2013
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I am wondering, will there be a flood of Ebay GPU buyers start filing charge back against the sellers.

Ebay policy allow buyers 60day to file , almost like free GPU rentals for 60day.

Sellers would have to pay for return shipping cost as well.
 

keybored

Active Member
May 28, 2016
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Card prices seem to be crashing on eBay. R9 290s were going for close to $300 just a month ago. Now the average appears to be closer to $200.
I also noticed a lot of bids with accounts that had zero feedback or feedback below 10. If someone sold to one of those then the risk of a return is much higher, I'd say. BIN listings would also be higher risk.
 

Klee

Well-Known Member
Jun 2, 2016
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I'm sure glad I sold my RX 480's when the price was high of course I will buy some RX480 470 580 570's when the price crashes just to upgrade all my pc's with older graphics cards.