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Old 2007-10-29, 14:29   #1
Prime95
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Default Good news: Penryn power consumption

Four cores running prime95: just 73 watts

http://www.tomshardware.com/2007/10/...ng/page14.html
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Old 2007-10-29, 16:16   #2
Andi47
 
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And they used Prime95 for testing!
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Old 2007-10-29, 16:28   #3
ewmayer
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Impressive - That's pretty close to something you could put into a high-end notebook. [The reason I care is that like many other DCers, I shall only ever be buying notebook PCs anymore - and all the non-server computers at my work are also notebooks, so the trend seems quite pervasive.]

I must say, Intel seems to have really hit a home run w.r.to the performance-versus-power in the Core series - double-pumped SSE2/3/4, and low power usage to boot! This time it's AMD who'll be playing catch-up - it will be interesting to see how Barcelona stacks up when those hit the mass market.

The one downside: even running Prime95 full-blast on both cores, my Core2duo-based home notebook PC no longer makes as good a space heater as my old vintage-2001 laptop did - an important consideration with the colder weather coming. I've also swapped out all my most-used incandescent light bulbs with CFLs - so paradoxically, I may actually to turn on the heat more often this winter, and my overall electric bill will likely remain about the same. But for the other 8 months of the year I am indeed greener than before.
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Old 2007-10-29, 18:21   #4
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Quote:
Originally Posted by ewmayer View Post
I've also swapped out all my most-used incandescent light bulbs with CFLs.
I am skipping CFLs and will gradually move to LED's, my first on hangs outside next to the door and shines on the house number. Much nicer (looking natural) frequencies too.
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Old 2007-10-29, 18:59   #5
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Quote:
Originally Posted by tha View Post
I am skipping CFLs and will gradually move to LED's, my first on hangs outside next to the door and shines on the house number. Much nicer (looking natural) frequencies too.
You must have tried a different brand/type of CFL [I have the cool-temperature-spectrum ones form GE, thanks to Luke Welsh, who pointed me to them and sent me a few free samples] - I can't tell the difference between the quality of light given off by mine vs. the incandescents they replaced; the only thing I notice is the less-heat-given-off and the resulting lower electricity bill.

Last fiddled with by ewmayer on 2007-10-29 at 18:59
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Old 2007-10-30, 03:59   #6
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Quote:
Originally Posted by ewmayer View Post
The one downside: even running Prime95 full-blast on both cores, my Core2duo-based home notebook PC no longer makes as good a space heater as my old vintage-2001 laptop did - an important consideration with the colder weather coming.
I got some junked P III's last winter to use as computing space heaters in my home office, keeping the rest of the house colder. I've got two of them turned on so far.
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Old 2007-10-30, 16:45   #7
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Quote:
Originally Posted by wblipp View Post
I got some junked P III's last winter to use as computing space heaters in my home office, keeping the rest of the house colder. I've got two of them turned on so far.
I may haul my no-longer-used [except as emergency backup] laptop out of storage and crank it up, simply to provide a slightly-more-interesting way of using its wattage than my space heater [all I need to keep the BR warm, this being NoCal] provides. would that be violating the 2nd law of thermodynamics, do you think? Might I be subject to arrest?
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Old 2007-10-30, 17:39   #8
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Quote:
Originally Posted by ewmayer View Post
I may haul my no-longer-used [except as emergency backup] laptop out of storage and crank it up, simply to provide a slightly-more-interesting way of using its wattage than my space heater [all I need to keep the BR warm, this being NoCal] provides. would that be violating the 2nd law of thermodynamics, do you think? Might I be subject to arrest?

I guess the answer is no. I wish I was good enough on entropy
as applied to information theory to explain why.
I have a fridge which warms the room without violating the 2nd law.

Last fiddled with by davieddy on 2007-10-30 at 17:45
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Old 2007-10-31, 13:47   #9
R.D. Silverman
 
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Quote:
Originally Posted by Prime95 View Post
Four cores running prime95: just 73 watts

http://www.tomshardware.com/2007/10/...ng/page14.html

What was the per-processor utilization, versus just one processor.

I am curious to see how much cache contention will affect 4
running copies of NFS.
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