View Full Version : what makes the swifty so good?
Is it the 68CFM fan or the heatsink, becuase I have the hedgehog right now with a delta 38cfm. and I'm wondering if I get the 80mm 68cfm with a funnel would it do the same as the swifty.....because that would only be about 35 rather than 75.
or is the swifty HS that much better than everything else.
also how do you measure case CFM? is it adding up all your fans???
I don't think adding an 80mm fan would quite put you were the swifty is but it would be close. The shear size and thought put into the swifty gives it the edge over most normal sized heatsinks. An 80mm fan is a good thing since you can make the thing pretty quiet and still get better performance.
35 to 75? Didn't understand that bit...
Anyways, CFM for CFM, a smaller faster RPM fan will beat larger fans after deducting pressure/head losses (just like pumps) from the airflow having to fight their way through dense HS fins. The resulting CFM will always be higher for the higher RPM fan but at the price of noise. If you are a headbanger you won't care but your neighbours will... But practically, 80mm fans with funnels perform just as good as high-speed 60mm but are probably cheaper and the funnels you can make yourself so it's a economical solution as well.
Its all about the surface area of the heatsink. The more of it and the better the fan, the better the heatsink performs. At least thats my view anyway.
chawken
08-14-01, 05:45 PM
Originally posted by KaHNZa
Its all about the surface area of the heatsink. The more of it and the better the fan, the better the heatsink performs. At least thats my view anyway.
That is correct. The larger the area, the greater the dissipation of heat.
I read that polishing the bottom of your HS "I can't think of the name right now" will improve conduction....well I grabbed one of my spare HS and used some aluminum polish with my dremmel and I could probably shave in that thing now.
anyway my question is....does it really work
but I did get to feel first hand how a HS works, as I was polishing I could feel the fins of the HS gettin warmer untill it got so hot I had to put it down, I thought that was pretty intresting because you always imagine how they work, but to actually see it work was fun...."I couldn't think of another word:)"
Silversinksam
08-14-01, 06:52 PM
Originally posted by AlanSr
I read that polishing the bottom of your HS "I can't think of the name right now" will improve conduction....well I grabbed one of my spare HS and used some aluminum polish with my dremmel and I could probably shave in that thing now.
anyway my question is....does it really work
Lapping the heatsink will greatly improve the performance.
To lap a heatsink go to an Auto parts store and buy some Silicone carbide wet/dry sandpaper, I recommend buying 600,800,1500 and 2000 grit
Now if your heatsink is already pretty smooth go right to the 800 or 1500 grit and end with the 2000 grit
To check for 'flatness' use a mirror or a flat piece of glass. There are other things you can use just improvise.
Dont forget to apply the thermal grease after you put everything back together or it will all be for naught
:eek:
ps some people use polish at the end process but I find that to be a waste and imho polish and thermal grease dont mix well especially if there is any polish remnants left behind. Lap your heatsink, you will make your cpu happier. :p
Hope I was able to help.
its also the reason it has a copper like plate to absorb heat from the Die and then has Aluminum pins to dissipate the heat faster so its pretty thoughtfully made
Patchmaster
08-14-01, 08:36 PM
Even if you decide not to use Artic Silver thermal compound, you should read the instructions here: Arctic Silver Instructions (http://www.arcticsilver.com/arctic_silver_instructions.htm).
Thermal compound actually does two similar, but slightly different jobs. At the macro level, where we could actually see it working, assuming we could get between the CPU and HS, the compound fills in the gaps between the CPU and HS, greatly increasing the flow of heat between the two. At the micro level, no matter how much effort you've expended sanding and polishing, the surface of the HS looks more like the inside of an English muffin than it does the mirror you think it is. The thermal compound fills in these nooks and crannies, displacing that highly non-heat-conductive air that would otherwise be there.
The problem with using polish or other cleaning compounds is they leave behind residue that fills the nooks and crannies, preventing the thermal compound from getting in there and doing its job. According to the Artic Silver site, these residues are essentially impossible to remove. So don't use polish or rubbing compound or even Lemon Pledge on your HS after you've lapped it. If you feel you absolutely must clean away the debris, use some isopropyl alcohol (NOT rubbing alcohol - it contains glycerin which will remain behind after the alcohol evaporates).
Great thanks fellas,
I'm glad I used one of my old ones then.....at least it looks real shiney to show off.
I'll run to the store today and get the sand paper 600, 800, 1500, and 2000.
Is there any special prep's that I need to know about. If they don't have silicone carbinate, will the regular stuff work?
Oyea CJTune, whenI said from 35 to 75, I was talkin about the price of me buying an 80mm "68cfm" with the funnel being about $35. and the swifty being $75
Which is the better mounting bracket?
The normal clamp or the screws that connect to your mother board?
and why?
Thanks everyone that writes back with input!!!!
killem1x1
08-15-01, 06:52 AM
Originally posted by AlanSr
Which is the better mounting bracket?
The normal clamp or the screws that connect to your mother board?
and why?
Thanks everyone that writes back with input!!!!
The holes in the mobo will provide much more stability. This thing is about a pound, and believe me, it's heavy if you try to move your mobo with it attached.
Warning note:
If you do decide to go with the mobo hole mounting, be very careful that you don't damage the traces on the mobo. I did, I was able to solder them back together, but I've been soldering for a looong time, and the job still took about 6 hours. The problem lies where you tighten the HS down. if the screws in the mobo holes turn, then no more mobo.
Hope this helps!
From the sound of that I think I'll just stay with the regular clip.
My hedgehog now has 3 clips to hold it on. I've never had a problem with it moving, and its a moster also.
Mine is 100% aluminum, I don't have the copper one....
killem1x1
08-15-01, 10:42 AM
Well I certainly didn't intend to scare you off, as this is a killer kooler!, I just wanted you to be carefull.
I have pulled it on and off 3 mobos now, w/ no problem.
Originally posted by phiber
its also the reason it has a copper like plate to absorb heat from the Die and then has Aluminum pins to dissipate the heat faster so its pretty thoughtfully made
Whether aluminiums 'dissipates heat faster' has no impact on the deltaT you'll get for your CPU. It's just more machineable and cheaper so you get hybrid metal HSFs. You wanna dissipate heat at LOWER deltaTs, then the whole heatsink's gotta be made entirely out of metal with the highest possible thermal conductivity. Better HSFs are all copper (or all silver?). Just some info so no more of this misconception.
Originally posted by AlanSr
From the sound of that I think I'll just stay with the regular clip.
My hedgehog now has 3 clips to hold it on. I've never had a problem with it moving, and its a moster also.
Mine is 100% aluminum, I don't have the copper one....
Yeah, three clips are better than one as they distribute the forces evenly so that you're less likely to snap off any plastic lugs, esp. when HSF designers are so liberal nowadays with the clamping force of the clips.
I was cleaning my HSF yesterday, and noticed that I had a real clean spot right under the center of the fan, I'm guessing, that part of the HS is not gettin cool air on it and thats the part with the core of the chip.....is there a fix for this or is that one of the problems with air cooling?
Does anyone know anything about the ZALMAN CNPS3100?
it look different, and you can attach an 80mm to it.
Intresting but I havn't heard enough about it.
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