Heatpipes - horizontal or vertical?

[Thrackan]

Since nobody really seems to agree here on the interwebz, I thought I'd address my question to the manufacturer of my CPU cooler.

First off, I've been using my Scythe Shuriken to cool my E6750 for a while. I have to say it's a very nice cooler for such a small package!
On the E6750 (65 watts TDP), I got about 50-55 degrees Celsius under stress, while overclocked to 3,2Ghz (no voltage increase).

I've recently acquired a Core i7 920 (and 1366 VTMS clips, thanks for that solution!), which is in an entirely different league with its max 130w heat dissipation requirement. With HyperThreading enabled, temperatures shoot up to 70-72 degrees under full load, on stock speeds.
Turning off HyperThreading helped to get me to around 60 degrees, but that's not enough headroom to seriously start playing with clocks here.

The thing is, I had my cooler mounted with the heatpipes horizontally oriented on the E6750, and now they are vertically mounted on the i7.

Does the orientation of the heatpipes have any effect on the cooling efficiency?
I can imagine it does, since there is a bend in all 3 pipes, which might cause cooled down fluid to stay in the area most near the fan, but I'm not exactly sure about the physics involved here and the intentions of the design.

If you can't answer my question, I will try it for myself and report back in with the results, but I'm curious what the design people say about it, since the cooler is shown on the manual/box with the heatpipes vertically oriented

Oh and just another one while I'm at it: I hate push pins ever since my cooler just came off a couple of months ago (imagine watching a video and hearing *THUNK*, then seeing your temps increase like a maniac, not pretty ). Do you plan on getting a screwable VTMS mounting kit for socket 1366?

[hiroshige]

Hello Thrackan,

Please have a look at this one:
Scythe Zipang - Super Size Me!! - VR-Zone.com: News and Reviews
It's the same for almost all Scythe coolers, for Zipang this is a bit more significant.

Regarding PushPins, please have a look at this video which was done by 2 Scythe Freaks: YouTube - Stability of Push Pins - Scythe Orochi

Cheers,
Stefan - Scythe EU Hamburg

[Thrackan]

The Zipang has about the same shape of heatpipe configuration as the Shuriken has, but I've heard many a critique on that test, since it hasn't been tested more than once to rule out reseating and reapplying of TIM as being a factor on this temperature drop.

About the push pins though, that test looks like a waste of motherboard
I just had a personal issue with them pins so I decided to make my own screw-on setup

Here at Xbit they found a 2 degrees lower temp on the Zipang with the pipes mounted vertically:
http://www.xbitlabs.com/articles/coo...dtd1284_9.html

Though I think that's mainly because of the exhaust fan being able to suck "through" the then horizontally oriented fins...

[Thrackan]

Given the low amount of responses, I will just try it and post my findings over the weekend.