Re: a7n8x-x last upgrade. wich cpu is as the most for the price?

Thus spake DDC:
> On Wed, 12 Oct 2005 00:21:19 +0100, "Paul Busby" <me@xxxxxxxxxxx>
> wrote:
>
>> The 7000B Cu is very heavy indeed - just as well it is firmly bolted
>> to the m/b. I did consider the CuAl version but on paper, its
>> thermal properties didn't look much better than my 6000Cu. I would
>> prefer the heavier unit with 4 bolt mounting than the lighter one
>> clipped on with its consequent leverage on the socket.
>
>> The 6000Cu had a 120mm Dustproof Acousti fan running off 12V @
>> 1500rpm where my new 7000 is running on its lowest setting with a
>> CPU running at a fair level of overclocking - albeit a mobile
>> version at 1350rpm (XP-M2500+ @ 2303MHz = 200x11.5/1.725V). My 80mm
>> exhaust fan is also running of ~5V @ 1350rpm. The CPU can run with
>> total stability for hours at 100% load using burnk7 which stresses
>> the CPU far more than Prime95 does. It does knock down the 5V supply
>> to reported low of 4.73V but survives without issue. If I'm willing
>> to up the Vcore to max my m/b will allow & run both fans at medium
>> speed, I can run this CPU @12x200, again with stability & headroom
>> to spare during warm weather but choose the quieter option.
>
>
>> If I was goofy enough to do Lan parties I may have 2nd thoughts
>> about the 7000Cu's excessive weight but my PC gets fettled then left
>> alone for months. I forgot I had my very well insulated
>> (soundproofed) Lian Li PC60 case's front stock fans set to medium
>> speed so reset them back to low before testing & lowering the Vcore
>> to its current value. The 7000Cu never let me run @ 2400MHz or
>> 2300MHz @ less than 1.750V or with so little sound that my 2 Hitachi
>> SATA discs are the main source of noise. The m/b is well able to
>> cope with the more than recommended weight & feels very solid. The
>> extra cooling & reduced noise exceeded my expectations. Apart from
>> having to remove the m/b from the tray it was much easier to fit
>> than the 6000 was. The XP-M2500+ was a real bargain as well!
>
>
> You know it's pretty much complicated to chose a fan. lol, first of
> all we must check the thermal dissipation factor, but the al and
> copper are very close... So i've done some research in my books for
> the thermal resistance of the copper and the aluminum. Well what i say
> is that copper is the most efficient for heat dissipation vs aluminum
> witch as the half of it's ability. But considering that Al has the 1/3
> of the mass of the copper it seem to regain some points. In a other
> hands the ,Al, has the ability to retain the heat much longer so a
> good fan should be use "that's the reason it's more noisy". By that
> both fans are mostly identical. one will be more noisy " the aluminum
> one" and the other not. 27db for the full speed is again more queit
> than most HDD.
>
> that link here shows at the page 7 the curve desing of the fans.
> http://www.zalman.co.kr/Upload/product/CNPS7000B_eng.PDF
> One thing would have been fun to be shown in the diagram. The
> operating point of temperature "40*C, 50*C" witch one goes whit the
> diagram? It's missing so by this we can't figure out or well it will
> operate.
>
> An other point is coming, the more resistivity you have in thermal
> exchange the less transfer you have. it like what you've got in your
> wall, the insulation, the bigger the number for the resistance the
> better it reduce the exchange in heat. So ie : for the heating period
> in the winter we've got less transfer. So here it's the same
> situation. people got confused by the weight and it's thermal
> resistivity. but the desing in the copper kind show that it doesn't do
> much better than the al one.
>
> The real factor that rule my choice is this.
> 0.29 ~ 0.22 ¡ÆC/W for the CNPS7000A-AlCu LED
> 0.27 ~ 0.20 ¡ÆC/W for the CNPS7000B-Cu LED
> So the .02W/*C is very small in gain when choose a heavy weight from
> an other when you have mostly the same thing at the alf of it's
> weight.
>
> i steal stick with the al even if the copper the "kind of steel or
> metal" is better. Also i'm sure that this fan was desing on paper with
> the aluminum and for extra marketing, they've build one with copper
> just to brag around...
>
> DDC

My aim was max noise reduction. My original thoughts were tempered by the
thermal resistance of my 6000Cu not being that much higher but I guess that
the 7000 is just a much better design that has far better airflow through
the fins & better fan positioning. I wonder how much a silver version would
cost, though its contact area would need plating?! The new 9500 won't fit
socket A but ain't that heavy with a thermal r of 0.12-0.16C/w that probably
betters lower-end water cooling.

--
Thank people in advance? Thanking or cursing them afterwards at least
gives some feedback!


.

Relevant Pages

  • Re: Self-tuning piano
    ... The Mapes coated string was not coated so well that a few copper ... This could be verified by measuring the resistance ... > between the copper and the steel. ...
    (rec.music.makers.piano)
  • Re: From NEC2 to the real world with accuracy
    ... current will travel through the proverbial path of least resistance - ... saving money over hard drawn copper. ... So I don't have problem using some enamel to protect it (and ... built a quad knows insulated wire is much too heavy, ...
    (rec.radio.amateur.antenna)
  • Re: From NEC2 to the real world with accuracy
    ... current will travel through the proverbial path of least resistance - ... saving money over hard drawn copper. ... So I don't have problem using some enamel to protect it (and ... built a quad knows insulated wire is much too heavy, ...
    (rec.radio.amateur.antenna)
  • Re: Request for help with overheating issue on 1990 Mazda MX-6
    ... I believe you have a somewhat marginal airflow through the radiator (or ... The ground connection for the cooling fan may develop resistance due ... lower speed than it should and does present cooling problems at slow speeds. ...
    (rec.autos.tech)
  • Re: How much current can a PCB handle?
    ... Think about wire instead of copper foil. ... is 0.5 inches square and four inches long. ... It has a resistance from one end to the other ... The ends meaning where the connections are made. ...
    (sci.electronics.design)
Loading