SPCR

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

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.

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.

maalitehdas wrote:Maybe you can reach the TDP with 100% burning thou

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

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...