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MSI GTX 580 Lightning SLI - LOUD! - Page 8

post #71 of 72
Quote:
Originally Posted by juano View Post
Yea see this is what I would call focusing too much on the minutia or getting tunnel-vision. The two cards you just listed as examples are the exact opposite that I have experienced from my first hand experience with both cards and cooler in question. I'll explain the reason but it's important to note first that what I'm about to explain is not just focusing on the minute details, this makes a huge difference in practice and should be one of the first things considered when standing a GPU vertically while direction of the fins is one of the last things if even considered at all.

The heatpipes in the Asus DCII cooler are terrible for standing vertically, I haven't been able to confirm with Asus (their reps I've been able to get ahold of have no clue what I'm talking about) but all my evidence points to the heatpipes in the DCII being groove type heatpipes which are heavily influenced by gravity and therefore do not work well at all when the heatpipe is facing downwards away from the heat source. The vapor collects in the bottom because the capillary action in the groove type wick isn't powerful enough to overcome gravity. 3 out of the DCII's 5 heatpipes fave downward, in my personal firsthand testing and experience this has accounted for atleast an 8C degree increase in temperatures based on orientation alone. I do not subscribe to the idea that fin orientation will have any significant effect on temperatures but I'd love to see anybody show me anything even half as significant as 8C from fin direction.

The TFIII cooler in the Lightning however employs heatpipes that have a powdered sintered metal wick design (this was independently confirmed by two MSI reps, and is proven by my own testing) which have a much strong capillary flow and are therefore much less dependent on gravity and orientation to work effectively. In my testing of rotating cases 90 degrees (both my old Antec 300 and my new RV03, to have both orientations in both cases) the TFIII cooler is only 2-3C cooler and more effective when it has to work against gravity in a vertical position.

Once again I'd love to see anybody who chooses to focus on only the minute details to show me an difference due to fin orientation or any other of these little "optimizations" that have a difference anywhere near as significant as 8C. Oh and that was on auto fan speeds by the way so it also ran it's fan faster trying to keep cool and was still 8C hotter. I also did tests with the fan speed locked but I don't remember the differences there because the DCII was very quiet so the fan ramping up didn't affect me and I don't know what I did with my notes, I might've thrown them away, but I do remember the 8C auto fan speed difference because that was what made meant that I wasn't comfortable having a groove type heatpipe in a vertical case. Other tests have shown this effect to be as great as 20C in other coolers.
Cool, didn't know that about the DCII...even though I owned one for some 5 months, great card!
Thanks for clearing that up for me, juano!
Will correct my previous post.
post #72 of 72
Yea I loved the cooler on that card, 'cept for the wick in the heatpipes, it was really cool and quiet. About the same temps as my Lightning (just a touch better) but noticeably quieter while doing so. Just too bad about them cheaping out on the heatpipes, groove are cheaper but really don't help what would be a dominate cooler otherwise.
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