Natural convection & C2D

Halion · Post by **Halion** » Thu Sep 27, 2007 12:43 pm

Hello guys,

I was wondering; is it possible to adequately cool a Core 2 Duo E6320 CPU (not overclocked) using only one of those massive heatsinks with heatpipes, fanless, and caseless, with the motherboard just lying on a table, for example?

laguz1 · Post by **laguz1** » Thu Sep 27, 2007 1:33 pm

got any air movement around? in still air...probably not, at least not at load...

if you have any air moving through your heatsink (like if you put it near a window or something), then its possible

TheJaff · Post by **TheJaff** » Thu Sep 27, 2007 9:37 pm

If you have a massive heatsink oriented so that hot air can travel straight upwards (for example, if you use a noise ninja you have to have the mobo standing in vertical position) you should get a decent amount of air renewal even if the rooms' air is "still". Dunno if it would be enough under load though.

smilingcrow · Post by **smilingcrow** » Fri Sep 28, 2007 2:15 am

Iâ€™ve been testing a few boards and CPUs this week with the motherboard sitting outside of the case horizontally in the way you are enquiring about. I have a Ninja Rev 1 installed and you can easily cool a C2D at load using such a setup.

Halion · Post by **Halion** » Fri Sep 28, 2007 3:57 am

laguz1: No air movement unfortunately.

smilingcrow: Interesting. Do you mean with the motherboard horizontally (and heatsink vertically)? And really with no fan at all?

What do you think would be the best heatsink for this?

smilingcrow · Post by **smilingcrow** » Fri Sep 28, 2007 9:23 am

Halion wrote:smilingcrow: Interesting. Do you mean with the motherboard horizontally (and heatsink vertically)? And really with no fan at all?

Yes to both.

Halion wrote:What do you think would be the best heatsink for this?

The Ninja is particularly good for passive cooling but I donâ€™t know how it compares to other coolers when used in the vertical position.

Intel E2140 (M0) 1.6GHz, Gigabyte GA-G33M-S2

Ambient â€“ 22C
Idle â€“ 1.2GHz, 1.187V â€“ 34C
Load (1 hour Orthos â€“ in-place FFT) â€“ 1.6GHz, 1.136V â€“ 52C
Delta â€“ 18C
Tjunction â€“ 85C

The CPU was undervolted using RMClock but not excessively; it should go quite a bit lower using the BIOS.

I have also tested an E4400 but I didnâ€™t run it at load for an hour to see how the temperatures climbed. In the short time I did test it the temps didnâ€™t get that high and it has a Tjunction of 100C so I canâ€™t imagine it would get close to that at stock speed.

djkest · Post by **djkest** » Fri Sep 28, 2007 2:26 pm

The ninja was actually designed to work passively with lower-powered CPU's, I'd say it's probably your best bet.

Halion · Post by **Halion** » Fri Sep 28, 2007 4:11 pm

OK, I think I'll go for a Ninja and having the motherboard mounted vertically, but which Ninja version would you guys recommend?

djkest · Post by **djkest** » Fri Sep 28, 2007 4:42 pm

I believe the Ninja Plus Rev B is the one that has the most refinement in mounting capabilities.. you should ask one of the intel guys to make sure though.