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Thread: most efficient CPU (maybe) |
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Thread Status: Active Total posts in this thread: 28
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges: 
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I recieved a small device using an Intel Atom Z3740 and it is by far the most efficient CPU I've ever run at the WCG. It only has 1 day of runtime validated but it looks like it will produce upwards of 800 BOINC points per day running its 4 cores 24/7. It has validated 1 FAHV (912 ppd), 3 FAAH ( 821+ ppd) and 1 MCM (952 ppd). Measured at the wall it uses 4 watts.
----------------------------------------An easy relative efficiency measurement I use is: (24/7 BOINC ppd) / (watts running BOINC). This gives a value of 800/4 = 200 for the Z3740! For comparison, the C2Ds I've measured are around 23. So almost an order of magnitude increase in efficiency over C2Ds. 2nd generation i3s are around 33. A P4 that used 120 watts for 500 ppd would be 500/120 = 4.167 :(. My Android tablet has a dual core Armada PXA986 (I think) and can produce 254 ppd using 3 watts, or 254/3 = 85. I suspect the latest or next crop of quad core Arm processors may equal or exceed the Z3740's preliminary 200. Or maybe a quad socket linux box running mostly FAHV? Do you know of any system that exceeds 200? edit: After 5 days and 21 hours validated it has a BOINC ppd of 774, or 774/4 = 193. I will update again if it goes much lower. [Edit 1 times, last edit by enels at Jul 2, 2014 3:41:56 PM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Consider adding ihe initial energy expended in creating the computer. This can really change the return per watt.
Lawrence |
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yoro42
Ace Cruncher United States Joined: Feb 19, 2011 Post Count: 8979 Status: Offline Project Badges: 
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Intriguing. Do you mind if I ask what the little device is?
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OldChap
Veteran Cruncher UK Joined: Jun 5, 2009 Post Count: 978 Status: Offline Project Badges: 
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Other end of cost scale=
----------------------------------------xeon e5 8c/16t @ 2.4 dual cpu rig Mixed work load = 93400 average ppd last 30 days and 260 va at the wall or 248watts Seems more efficient on your scale  |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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@Lawrence. That is a good point and I'm considering how it would work. But please anybody else try
@yoro42. It is an Asus Transformer Book T100TA. It has 2 GB RAM, 64 GB SSD and Windows 8.1 32 bit. @OldChap. I think I found your host at free-dc and its RAC is 13642. Did you mean 93400 WCG points? If so your value would be 13642/248 = 55. |
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OldChap
Veteran Cruncher UK Joined: Jun 5, 2009 Post Count: 978 Status: Offline Project Badges:
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Yep, I get it now. I am less and less inclined to pay attention to points as a metric to rate the performance of a rig having regularly seen various rigs claim 5 times the amount of points that my above mentioned rig claimed for the same wu, but at face value and based on the cpu only I would expect the performance of your find to be in the order of 1/12.25 (0.0817) of mine so if you can do this whilst using 4w rather than the 20.25w that I would expect if power use correlated to my rig, it is indeed rather efficient. If you buy yours for under ~$350 too it is a win all round
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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Ok Lawrence, I'll give it a try:
overall efficiency =(total points) / ((EkWh + DkWh * (days runtime) ) EkWh is the energy used to produce the device. DkWh = ((watts * 24) / 1000) I'm going to estimate EkWh as: (price of device) * 10. As an example, a device that cost $400, using 50 watts, and running full time for a year, producing 1 million BOINC points would have an overall efficiency of: DkWh = ((50 * 24)/1000 = 1.2 1 million / ((400 * 10) + (1.2 * 365)) = 1 million / (4000+438) = 225 points/kWh After 2 years it would be: 2 million / (4000+876) = 410 points/kWh And 10 years: 10 million / (4000+4380) = 1193 points/kWh |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7693 Status: Recently Active Project Badges: 
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I may be missing something here, but let's try this. You show a total of 4327 WCG points ( you have a plus sign for the 3 FAHV units) so lets round to 4350. That would give 621 BOINC points per day. 621/4=155.25. Still an impressive number I will admit. I would average the numbers over about 10 days and see what figure that gives. I would be interested to see how that would be.
----------------------------------------Cheers
Sgt. Joe
*Minnesota Crunchers* |
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yoro42
Ace Cruncher United States Joined: Feb 19, 2011 Post Count: 8979 Status: Offline Project Badges:
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@yoro42. It is an Asus Transformer Book T100TA. It has 2 GB RAM, 64 GB SSD and Windows 8.1 32 bit. enels, thanks for the information. My 1st thought was 'if only it was not Windows 8'... I'm still impressed though. I've got a couple of old dogs crunching that are anything but green. I keep waiting for them to die but it might be better to replace them instead. |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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@OldChap By my math, the Z7340 is 3.5 times as efficient 193/55. Not 20.25/4 = 5 times. I was hoping for 200 but currently at 193 if I am calculating it correctly. See below.
@Sgt. Joe My math might be wrong. I did the first ones by hand. Now with more results I am using the total runtime reported under device installations. I updated the first post to reflect more results. I will update again if it goes much lower. Or in 10 days. In case my math is wrong I'll show my work: Device installations shows 5 days and 21 hours of runtime = 5.875 days, and 7962 WCG points. 7962/7 = 1137 BOINC points in 5.875 days of runtime = 1137/5.875 = 193 BOINC points per day of runtime. Multiply this by 4, as 4 threads are running, and 193 * 4 = 774 BOINC points per day. Dividing by 4 watts puts me at 193. @yoro42. You are welcome. I also struggle over whether or not to retire a WCG computer. So far two have retired themselves :) |
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