Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
Thanks! I could not find the kind of info you came up with.... very useful!
--
KWW
"Paul" <nospam@needed.com> wrote in message
news:nospam-1805040306040001@192.168.1.177...
> In article <LWdqc.17419$qA.2099148@attbi_s51>, "KWW"
> <kwalker@nospamaircooled.net> wrote:
>
> > I was getting ready to put a really good fan on my son's A7N8X-E, a
> > Thermaltake Silent Boost A1889-01. I had tried it on another board and,
vs
> > the stock AMD cooling fan (Retail box) it cut about 20C off the
temperature
> > (OK, I also used Arctic Silver with it... vs the stupid tape on the
stock
> > fan...).
> >
> > The fins are all copper... runs quietly... Anyway, the bummer is, on the
> > A7N8X I see that there are holes to fasten down the CPU cooling fans
that
> > some with some of the heat sinks I looked at. Also, it doesn't look
like
> > the 462 CPU socket is fastened down to the mobo in any extra special
way...
> > so I wonder if this heatsink is going to be too heavy over the long
haul...
> > what with vibration and all. I like the way it is quiet, and the heat
> > transfer characteristics of the all copper heat sink are attractive.
> >
> > Anybody have thoughts/experience/suggestions? I would prefer a fan that
did
> > now howl. I also want to keep the chip cool! If the case were sitting
on
> > its side so that CPU would be flat, that would be one thing, but this
case,
> > as with most of them these days, sits upright.
> >
> > I do not plan to overclock the system.
> >
> > TIA!
>
> On the Zalman web page for the 7000a, it says:
>
> "Specified maximum weight for a cooler is 450g for the Intel
> Pentium 4 and the AMD Athlon 64, and 300g for the AMD
> Socket 462 CPU. Special care should be taken when moving a
> computer equipped with a cooler exceeding the weight guideline."
>
> People do use heatsinks which weight more than those limits, but
> obviously care must be taken when moving or bumping the equipment.
>
> There is also a spec (somewhere) for how much normal force can
> be safely applied to the socket or to the top of the processor
> chip (whether it has a heat spreader or not). The normal force
> is the force into the board, applied by the clamping mechanism,
> and the Intel retail solution must have taken first prize for
> applying the most force. The normal force maintains contact
> between the heatsink and the processor, under shock and vibration.
> Generally, as a user, you don't have a say in that parameter.
>
> As for how to shop for a heatsink - you can have a light/noisy/hot
> solution, or a heavy/quiet/cool solution. Heatsinks which use the
> screw holes aren't very popular, because the manufacturers got
> the impression that people didn't want to remove the motherboard,
> to remove the heatsink. For a person constantly pulling the processor,
> to try different ones, I guess you could see that point.
>
> Swifttech (swiftnets.com) used to have some heatsinks that used bolts
> to hold them down. There was a claim, that a computer equipped with
> a bolted heatsink was dropped from a second story window, and on
> landing, the heatsink was still in place (although the rest of
> the computer case was destroyed). So, using the bolts is definitely
> a worthy concept, it is just the convenience of top side clamps
> is more popular.
>
> Bolt on solution, now discontinued I think. Might be worth looking
> for, if you want something like this.
>
http://www.swiftnets.com/products/MCX462+%20INSTRUCTIONS.pdf
>
> This one uses the socket tabs.
>
http://www.swiftnets.com/products/MCX462-V-installation-guide.pdf
>
> (All of their installation guides)
>
http://www.swiftnets.com/installation.htm
>
> The downside of the Swifttech pin fin concept, is when you
> use "roughening" as a method of increasing the surface area
> of the heatsink, you pay a price in terms of noise. The turbulence
> and arrestance of the air path increases cooling efficiency and
> noise at the same time.
>
> A second concept, is the Zalman 7000 (either the AlCu or the
> pure copper one). It uses sheer size, and plenty of fins, to
> get a large surface area, with low resistance to air flow.
>
>
http://www.zalman.co.kr/eng/product/view.asp?idx=54&code=005009
>
> This uses a lamination of plates, arranged as fins. Where the
> plates clamp together, forms a chunk of metal for the core. A
> fan, without noisy housing, provides the cooling air. Thermal
> resistance is around 0.22C/W, which is pretty good. It can be
> run at full speed without being audible. The downside of this
> solution, is its size. As I said above, this one is in the
> heavy/quiet/cool camp. Even the AlCu model is still over the
> allowed weight for a heatsink, but as long as you uninstall
> it before moving the computer, all will be well. If your computer
> was going to be a LAN party machine, stick with a bolt-on style
> solution, for peace of mind.
>
> Another issue, is the sheer physical dimensions of the thing.
> It has a radius of 55mm, measured from the center of the die.
> The PSU cannot be butted against the edge of your motherboard,
> if using one of these. To figure out the clearance required,
> drag a picture of your motherboard into Photoshop. The array
> of pins has outer dimensions of 1.8 inches, leaving 0.05 inches
> between rows. You can use those dimensions to estimate where
> 55mm or 2.17" radius can reach. (2.17 - 0.9 = 1.27 inches, from
> the last row of pins, to the PSU.) The arrangement of PSU and
> motherboard must be such, that a small gap exists between them.
> I estimate about 0.35" minimum or so on your board.
>
> The Thermaltake has a thermal resistance of 0.5C/W. This means,
> if the processor dissipates 60W, the processor die will be 30C
> above the case air temperature. If that was 25C, then the
> die will be at 55C or so. The Thermaltake also doesn't have
> a weight specified, and is an all copper product.
>
> (You should take some of these thermal resistance ratings or
> graphs with a grain of salt, because some I have seen in print,
> are just ridiculously good.)
>
> HTH,
> Paul