Isn't this an aluminum hs w/a copper base? Designs like that have come, and haven't come up w/ results nearly as good as this. I'm confused.
What makes the AX-7 works o well?
- Thread starter salman327
- Start date
Swiftech MCX462 = Copper base + aluminum pins with the same, if not better, performance.
Alpha PAL8045 = Copper base (at least what comes in contact with the CPU die and a large area around it) + aluminum pins. Gives you just as good performance as well.
Alpha PAL8045 = Copper base (at least what comes in contact with the CPU die and a large area around it) + aluminum pins. Gives you just as good performance as well.
Its all about the design. The AX-7 uses semi-radial fins which allows the fan to better disipate the heat. And as Shaorinor said, other heatsinks that utilize similar combinations of copper and aluminum work just as well if not better. Most heatsinks however are made much more cheaply and without as much thought to design, rather resorting to brute force (AKA more fins and a higher cfm fan)
GoodRevrnd
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- Dec 27, 2001
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I think he was referring to designs very similar to the AX-7, not just copper base w/ aluminum spreaders. I think it probably works so well because it has a nice solid block where the fan's dead zone is from which the heat can extend to all the spreaders that get all the air rush contact. Correct me if I'm wrong, though.
Copper transfers heat well and Ally dissipates it better than copper, an ideal marriage if the two are connected well and better than a sink made solely of either material, Thermalright and Swiftech are masters of this
GoodRevrnd,
Hit the nail on the head. Also the air flows completely through, promoting better airflow.
BTW Witchfinder, aluminum is inferior to copper in every aspect, as far as heat transfer goes. Aluminum is cheaper and much lighter, that is why it is used.
Hit the nail on the head. Also the air flows completely through, promoting better airflow.
BTW Witchfinder, aluminum is inferior to copper in every aspect, as far as heat transfer goes. Aluminum is cheaper and much lighter, that is why it is used.
* A good design,
* Materials with good thermal conductivity,
* And a 68dBA fan!
No thanks brother... for a few extra cooling degrees, that's TOO LOUD for my taste
I'd go with the quieter Alpha 8045 everytime.
If you need extreme cooling, go with a Peltier chilled water cooling system
* Materials with good thermal conductivity,
* And a 68dBA fan!
No thanks brother... for a few extra cooling degrees, that's TOO LOUD for my taste
I'd go with the quieter Alpha 8045 everytime. If you need extreme cooling, go with a Peltier chilled water cooling system
IMHO it is a marketing boondoggle.
The AX7 was released with an 80 cfm fan vs a 68 on the swiftech and a 50 cfm on the 8045.
All three sinks are great comparison sinks as they are homologous- Approx. 28 cubic inches in volume, cu/al hybrids.
The comparison error is flawed when you ingnore other constants such as noise. I could put a 5 HP leaf blower on any sink and claim thermal supremacy when as a practical matter the point it is meaningless.
Witness all the forum posts with people scrambling for the panaflo and other low noise fans.
Comparisons need a constant like noise to to bring it ito focus. It is myopic to base any heat sink comparison on one point i.e. I could select a heat sink for the lowest noise and ignore thermal performance. Noise, thermal performance, cost, ease of mount etc. these points are all inextricably linked you need at least one other to make it realistic.
How Noise Pollution turns $80 heatsinks into $30 heatsinks
Alpha PAL 8942 PIV Heatsink
Normalizing your data on the above two linked examples the Alpha and the AX7 show they have nearly exactly the same thermal performance of .34 C/W @ 38 dB(A) my guess is the swiftech would fall on the same point. Homologous sinks with homologous fans tested with a constant.
The copper aluminum myth has been around for awhile and just will not die. If you compare heat transfer coeff. with copper vs. a hybrid, copper blows them away . Actually the AX7 and other super sinks do not fair as well in real terms as you would think as regards to overall eff.
Why do they work so well? A 30 cubic inch heat sink(inclusive with fan) with a high speed 80 cfm 52 dB(A) fan
It is a legimate strategy to use a large heat with a low speed fan for noise reduction and maximum performance. In the above link the thermal performance hit was 6C for the noise reduction. I think OC.com in AX7 original review said it was approaching water cooling in performance. Again on a practical comp. maybe equal to the noise a water system makes......?
Too many people focus on the absolute thermal number which is what the manufacturer goes to the bank with and then leaves his customers the dirty job of trying to figure out what fan to use. At least swiftwch supplied a variable speed control option.
The AX7 was released with an 80 cfm fan vs a 68 on the swiftech and a 50 cfm on the 8045.
All three sinks are great comparison sinks as they are homologous- Approx. 28 cubic inches in volume, cu/al hybrids.
The comparison error is flawed when you ingnore other constants such as noise. I could put a 5 HP leaf blower on any sink and claim thermal supremacy when as a practical matter the point it is meaningless.
Witness all the forum posts with people scrambling for the panaflo and other low noise fans.
Comparisons need a constant like noise to to bring it ito focus. It is myopic to base any heat sink comparison on one point i.e. I could select a heat sink for the lowest noise and ignore thermal performance. Noise, thermal performance, cost, ease of mount etc. these points are all inextricably linked you need at least one other to make it realistic.
How Noise Pollution turns $80 heatsinks into $30 heatsinks
Alpha PAL 8942 PIV Heatsink
Normalizing your data on the above two linked examples the Alpha and the AX7 show they have nearly exactly the same thermal performance of .34 C/W @ 38 dB(A) my guess is the swiftech would fall on the same point. Homologous sinks with homologous fans tested with a constant.
The copper aluminum myth has been around for awhile and just will not die. If you compare heat transfer coeff. with copper vs. a hybrid, copper blows them away . Actually the AX7 and other super sinks do not fair as well in real terms as you would think as regards to overall eff.
Why do they work so well? A 30 cubic inch heat sink(inclusive with fan) with a high speed 80 cfm 52 dB(A) fan
It is a legimate strategy to use a large heat with a low speed fan for noise reduction and maximum performance. In the above link the thermal performance hit was 6C for the noise reduction. I think OC.com in AX7 original review said it was approaching water cooling in performance. Again on a practical comp. maybe equal to the noise a water system makes......?
Too many people focus on the absolute thermal number which is what the manufacturer goes to the bank with and then leaves his customers the dirty job of trying to figure out what fan to use. At least swiftwch supplied a variable speed control option.
OK, sodcha0s and georgeszi, maybe I did TOO much research in to heatsinks and less into thermal conductivity - I stand corrected
the funny thing is though that these three sinks are the tops fan for fan and the one which I would have thought would have blown them all away (sorry bad pun) and the one I was looking at before I hounded the net for reviews was the Zalman Flower which gets a max amount of thin copper strips into the air over a large area but it doesn`t match the three hybrids for cooling performance, maybe the above mounted fan arrangement can`t get enough air into the sink and spends most of it`s time cooling the motherboard, I don`t know.. Also the relatively poor performance of the solid copper Globalwin CAK38 original compared to the dimentionally and electrically identical all aluminium FOP38 (the CAK doesn`t cool a whole lot better) made me think and got me doubting the ability of Copper to release the heat it`s transferred from the core.
What I wanted was something which allowed me to quieten the machine by using a lazy 80mm fan rather than a loud fast 60MM one and still maintain good temps and the AX-7 does exactly that at a very good price, the one thing about it in the UK is that they come Fanless..
I agree with most that these sinks should be tested with the same fan, preferably something sane around 35-45 CFM like a Panaflo, YS-Tech, Thermaltake or Sunon.
the funny thing is though that these three sinks are the tops fan for fan and the one which I would have thought would have blown them all away (sorry bad pun) and the one I was looking at before I hounded the net for reviews was the Zalman Flower which gets a max amount of thin copper strips into the air over a large area but it doesn`t match the three hybrids for cooling performance, maybe the above mounted fan arrangement can`t get enough air into the sink and spends most of it`s time cooling the motherboard, I don`t know.. Also the relatively poor performance of the solid copper Globalwin CAK38 original compared to the dimentionally and electrically identical all aluminium FOP38 (the CAK doesn`t cool a whole lot better) made me think and got me doubting the ability of Copper to release the heat it`s transferred from the core.
What I wanted was something which allowed me to quieten the machine by using a lazy 80mm fan rather than a loud fast 60MM one and still maintain good temps and the AX-7 does exactly that at a very good price, the one thing about it in the UK is that they come Fanless..
I agree with most that these sinks should be tested with the same fan, preferably something sane around 35-45 CFM like a Panaflo, YS-Tech, Thermaltake or Sunon.
GoodRevrnd has the right idea..... the AX-7 has a huge thick solid core right in the middle, where there really is no airflow. To really understand why this works so well, you have to understand some basic properties of heat transfer. Mainly, heat always moves from a warmer to a cooler place. Now this may seem obvious, but if you pay attention to the statements that many people make, they're not thinking this way. Another thing to remember is that the greater the temp difference, the faster the heat will transfer.
What's happening with the AX-7 is you have an 80mm fan blowing most of it's air on the fins, keeping them very cool. The thick core of the HS absorbs the heat of the CPU, and the heat naturally is looking for somewhere cooler to go, so it moves through the core and makes it's way to the fins and is quickly dissipated by the air moving over them. Since the underside of the HS fins isn't blocked, more heat is carried away instead of swirling around in the turbulent air.
If you look at most other heatsinks, they are usually designed with the fins comming straight up off of the base, and air must be forced out of only 2 sides. The middle portion isn't very efficient because there just isn't much airflow comming from the hub of the fan. The heat must spread across the bottom towards the edges to be dissipated. The bottoms of these heatsinks usually don't have near as much mass as the core of the AX-7, so they tend to stay a little warmer, especially in the center where contact with the CPU is made.
I would say the basic design of the AX-7 is superior to most other heatsinks, as far as dissipating heat is concerned. Another good design is the TI Dr. Thermal V77 series, and in some ways it's design is even better.
What's happening with the AX-7 is you have an 80mm fan blowing most of it's air on the fins, keeping them very cool. The thick core of the HS absorbs the heat of the CPU, and the heat naturally is looking for somewhere cooler to go, so it moves through the core and makes it's way to the fins and is quickly dissipated by the air moving over them. Since the underside of the HS fins isn't blocked, more heat is carried away instead of swirling around in the turbulent air.
If you look at most other heatsinks, they are usually designed with the fins comming straight up off of the base, and air must be forced out of only 2 sides. The middle portion isn't very efficient because there just isn't much airflow comming from the hub of the fan. The heat must spread across the bottom towards the edges to be dissipated. The bottoms of these heatsinks usually don't have near as much mass as the core of the AX-7, so they tend to stay a little warmer, especially in the center where contact with the CPU is made.
I would say the basic design of the AX-7 is superior to most other heatsinks, as far as dissipating heat is concerned. Another good design is the TI Dr. Thermal V77 series, and in some ways it's design is even better.
I dissagree as to superior, The AX7 tests tha same as, not better in the links I provided. With a constant the glaciator tested the same as with the same noise level so did the Alpha.
I agree The TI Dr. Thermal V77 series as well as the AVC sunflower are better designs. Normalize the testing as regards to size fan size and speed and noise and the super sinks are not all that super.
I agree The TI Dr. Thermal V77 series as well as the AVC sunflower are better designs. Normalize the testing as regards to size fan size and speed and noise and the super sinks are not all that super.
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