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PostPosted: Fri Aug 20, 2010 12:54 pm 
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Joined: Fri Dec 26, 2003 6:54 am
Posts: 3020
Location: Sweden
maalitehdas wrote:
CPU Core2 duo E8400
clock 3,0GHz -> 1,8GHz
voltage 1,25V -> 0,8V
wattage (idle/load) 36W/65W -> 12W/17W

Is that the TDP? I have to tell you that it has nothing to do with the real world usage.
It tops out at 40 W, in worst case situations. I've never seen a review showing more than that. TDP is a limit, you should read it as <65 W.

Here's a classic movie about oil cooling, it makes it look so easy and fun!
http://www.youtube.com/watch?v=PtufuXLvOok
http://www.pugetsystems.com/submerged.php


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PostPosted: Fri Aug 20, 2010 10:31 pm 
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Joined: Tue May 27, 2008 12:04 am
Posts: 162
Location: Finland
That's the TDP and surely never reached in normal use, I think that normal use add only 1-3W to idle consumption. Maybe you can reach the TDP with 100% burning thou? After undervolting I'm getting that 17W with 100% burning, but I have not used the meter with normal voltage so I couldn't tell at the moment.

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E8400 @ 1,8GHz, passive cooling | CPU Queen 7163 points | CPU stress test two hours, temperature 43C | fan rpm's ZERO


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PostPosted: Sat Aug 21, 2010 2:47 am 
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Joined: Sun Sep 05, 2004 1:51 pm
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Location: Gefle, Sweden
How about adding a slow fan to the chimney? :) (top or middle)
Wider chimney perhaps? If you can find another spare tube. Could make for an interesting comparison.


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PostPosted: Sat Aug 21, 2010 4:16 am 
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Location: Sweden
maalitehdas wrote:
Maybe you can reach the TDP with 100% burning thou

In fact, you can't. Here are xbitlabs results, using Prime95:
Image


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PostPosted: Sun Aug 22, 2010 3:46 pm 
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Joined: Tue May 27, 2008 12:04 am
Posts: 162
Location: Finland
mkk wrote:
How about adding a slow fan to the chimney? :) (top or middle)
Wider chimney perhaps? If you can find another spare tube. Could make for an interesting comparison.

Thanks for ideas, but...
- If a fan would move the air, chimney would have no use. It's either chimney or fan, and in my case I wanted to get rid of the fans.
- If i used wider chimney, i'd need to cut the case too. There is a 12cm vent on top of the case, so I suppose 12cm tube is ideal in P182. More height would surely add to the cooling performance but in my room it's at max too.

Mats: Thanks for the link and info. I suppose my E8400 would use at max 29W with original clock and voltage then, and hitting the TDP (if even possible) would need serious overclocking+overvolting. The low idle readings were a suprise too, I suppose my undervolted CPU is <2W at idle then. I should edit one of my earlier posts by these facts but i'll pass...

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E8400 @ 1,8GHz, passive cooling | CPU Queen 7163 points | CPU stress test two hours, temperature 43C | fan rpm's ZERO


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