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Conduct and absorb mean the same thing.
In this instance, heat. Both will take the heat, and move it into their means to transfer it to yet another medium - Transfer of heat to the surrounding air, which then moves the heat away yet again.
Technically speaking though, tower air coolers are also 'liquid coolers', because heat pipes contain a liquid. It does have a lower point at which is becomes vapor, which moves the heat to the furthest end of the heatpipe, a brilliant way of moving heat.
Though, back to the point.
Water has lower conductive ability than any metal, and even glass - However, it's means of cooling is different, it moves the heat away from the source much faster, and has much more thermal mass, if you're doing it right.
That is why water cooling appears to have lower temps, because it takes much longer for water, and the mass of the water to heat up.
Once they're both at their peak temperature, they're going to be similar heat, depending on how many rads you have.
(If you have more airflow, you will have more cooling, but, going by the most regular size of AIO, 2 fans, you will have the same temps, roughly.)
Cooling ability, and cooling potential are different things.
With a custom loop, you have a higher potential for cooling, for an AIO, you have a limit on it's ability. Since, with the latter, you're limited by what you've already got, one radiator, but with the former, you can have as many as you wish.
Water cooling CAN be worse than air cooling, and is often the case with 120mm rad AIOs. Or very poor configs on custom loops. (Like GPU and CPU in the same loop with a 240mm rad.)
Thermal mass =/= Conductive ability.
No.
You've got a different thermal mass, and you're displacing the heat.
If you place it in the water, you're getting much better contact to the thing you're trying to cool, thus improving conductivity, and you've got a much larger area to spread that heat (Meaning higher CAPACITY for cooling), and you've got a much larger area to transfer that heat to the air, cooling it further.
The proper way to test this, would be to get the same thermal mass, make sure only the same area is getting airflow/air exposure, and make sure that the object is going to stay warmer for longer than 5 seconds.
You're not testing somethings ability to cool a CPU (or other thing that produces sustained heat), you're testing how long it would take you too cool something down from x temperature, to x temperature.
You're testing the wrong thing, and you're going to attribute that to a CPU coolers ability.
That's a lot of variance you've got there;
1) The fan is what speed? How much air can it push? How far from the object?
2) What is the water temperature (because conductive ability is also dependant on temperature)? How much water is there?
3) What is the temperature of the object you're placing in the water? What metal is it made of? How much surface area is there on it? How much mass does it have?
4) What is the ambient temperature?
5) You're going to allow the air to increase in temperature, reducing it's ability to conduct heat, thus making it a worse performer?
6) Are you going to use your hand to place it in the water? Changing the amount of time it's exposed to said enviroments? Or changing the results by effecting water/object temperatures?
And, probably a bunch of other stuff I'm forgetting, or don't even know about.
To properly test this, you have to have the SAME enviroment for both things, you have to carefully regulate everything that it is exposed to, and what the results are.
You can't just dip it in water and go 'wow it is working!!!'
Measuring devices can be inaccurate, you would need something that can accurately measure the enviroment / object you're testing.
Read above, you'll see, there's so much variance, even a half credible scientist would throw that ♥♥♥♥ away without even glancing at it.
The cooling properties of the liquid highly depend on a lot of factors.
One case is not all cases, one use is not all uses.
Actually, there's plenty of methods MUCH better than air or water cooling, though impractical.
Also, if air moves, it makes sound - if air is going into that box, it's going to make noise.
But, wait, you can just seal the box, right?! Wrong, then it would overheat. Even in refrigerated enviroments, it overheats.
Watercooling would provide a COOLER experience, if they had more surface area to cool, and airflow over said areas.
But, if OP is going to use a 120-240mm AIO, then an air cooler would match or beat it performance wise, and produce just as much sound, or even less, because there's less resistance on what air is being pushed through, meaning higher airflow, and increased cooling ability.
Also, with water cooling, you've got pump noise, which can be more annoying than fan noise. Depending on the pitch, and tone.
It's not really opinion, it's fact.
The only time water cooling is worth it (thermally) is when you're doing large loops, with lots of surface area.
I would comment about the aesthetical standpoint too, but that's not what this has all been aimed at, and it's up to the end user to decide.
Because it adds cost, it's a niche market, and it adds a point of failure. Goes against everything businesses want to do, it would cost them to much - That's why you don't see it.
Back in the day, parts didn't need cooling, because they didn't use that much power.
As more power started being used, cooling became required. That's why we moved to active cooling.
Not because it's 'hip and trendy', it was needed.
If you're talking about cooling servers, that's silly.
Water cooling, especially on the scale, adds a point of failure.
If a server goes down, or a rack goes down, that's everything ♥♥♥♥♥♥ until it's fixed. ESPECIALLY ON SUPER COMPUTERS, where everything is working on the same thing, and is calibrated perfectly.
Also, server rooms are refrigerated, much lower temperature inside of them.
Liquid Nitrogen boils away, you would need a constant supply of it.
Then you've got the effects of the air around it (because when it boils away, it poisons the air around it.)
Then you've got delivery of the coolant, if you use to much, you crash the CPU, to little, and you're not using it right.
Then you've got moisture build up, ice melting over SMDs causing shorts.
LN2 isn't worth it for practically cooling a computer, or cooling servers.
Every cooler that Escorve linked this time has heat pipes - Commonly reffered to as 'air cooling', but is actually liquid.
We're long past the days of a slap of copper and aluminium (except if you're Intel.)
Even AMDs stock coolers have heat pipes.
Every heatpipe is 'this kind of heat pipe' - It's not a long thin piece of metal (copper), because it wouldn't effectively move heat. One end would stay hot, the other would stay cold.
Often times, the NH-D15 or DRP4 is better, better than both 120 and 360mm coolers, on par with 240-280mm.
Doesn't have the failure points either.
Heat pipes are a 'liquid cycle', but semantics.
A good air cooler will beat an AIO. Albeit by a few degrees, but it doesn't cost as much, and has less failure points, and is quieter (in some cases, with the right fans.)
Smacking the fan just knocks the bearing back into place. Barbaric, but it works....for a while.
Water cooling would keep it more silent, sometimes.
Your best bet for silence would be a big air cooler (the more overkill the better.) Then you can run fans at a lower speed, reducing fan noise, and air turbulence.
With a water cooler, you have to have fans spinning faster to push air - more air turbulence.
And you have a pump - humming noise.
Water would be an effective, if you do what I said in one (of the many) previous responses, but you would still have pump noise.
But, a good tower cooler is just as effective, and cheaper.
My honest advice, buy a NH-D15, or Dark Rock Pro 4.
Feel free to improve my practical test-setup though. I just didn't had many items I could use, so that's the best I could get with this current equipment. At any rate, it´s more pragmatic than just taking everything on faith, because the internet tells him so.
At least I had something to run a test with, before you came and butchered the idea, without offering any constructive criticism to it.
Besides, he just wants to play a game. So he doesn´t need a fridge in his pc. End of story.
At the end of the day, he will still be left wanting, one way or the other.
The OP is physically assaulting it's own pc to get it to, I quote: "be an ♥♥♥ and GRRRR's
have to kick its metal ♥♥♥ to make it shut up", instead of just repairing the fan. So the last thing we want, is to have it install any pumps spilling liquids in there.
940 was unlocked. It was AM2+ socket. It overclocked just fine. It didn't have the headroom like the AM3 versions did. The 945/55/65/75/80 (I think those were the model numbers) were on the AM3 socket (was applied the AM3 CPUs) - AM3 handled overclocking better.
Some folks had better silicon for some of the AM2+ x4 940 and could push them to 3.8 or 3.9.
1. Performance wise, liquid cooling is better because 280 and 360mm rads often have more surface area and fans, but it's often louder.
2. Your test method was simply bad and unnecessary, especially for something that's basically common knowledge at this point.
3. If he's just playing games then he doesn't need liquid cooling then, does he? Why spend 100+ on an AIO when he can spend only 80 on a beefy air cooler like the Dark Rock Pro 4 that performs like coolers which cost almost twice as much?
But are you really taking out your GPU that often? I can see it if it's like a test bench or something and you're messing around but most people just leave their case closed and forget about it.
Especially with most of Noctua's coolers as they're absolutely hideous.
Because personally, I have no dust filters on my PC, and I have 3 dogs, so dust does become an issue. I have to constantly take my GPU apart (because it's a blower), and clean the insides out.
Realistically, for other people, with dust filters an all that noise. Probably not, maybe once a year for a deep clean? Maybe not even that, once every couple of years?
HEY, don't dis the brown and beige!
Realistically, the majority of people don't touch their PCs, even those with tons of pets unless the system starts overheating because of ♥♥♥♥ clogging up their fans/filters.
I'm not talking about just gamers, I'm talking about ALL PC users, worldwide. Most people don't touch it because they don't know what they're doing and are typically afraid to do anything, lest they somehow break something.
I'll dis the brown and beige all I want, thank you very much... I don't know about you, but I wouldn't have a windowed case with such an ugly air cooler. I'd only buy them for closed cases, though in hindsight I'd be more likely to buy air cooling from be quiet! since they're just better due to less noise.
My systems are built in one of two ways, but both works of art in their own right: either they're vibrant and flashy, or simplistic and practical (aka RGB or non-RGB plain black)
Still, there's people (albeit very few) that would benefit from the accessability of an AIO.
I would love to be part of the brown and beige team! I would show it off proudly.
But on a serious note, I'd just use my black and white Arctic fans. If that wasn't an option, I'm pretty adept with a rattle can.
5 mins and it'll be a lovely shade of.....I dunno, what do I have in my paint box? Lmao.
Water, liquid, whatever. It's pretty much common knowledge that it's not straight up water because the loop would get full of algae and crud without biological inhibitors. Doesn't really matter whether or not you say liquid or water... and many people running custom loops do use distilled water and add the biological inhibitor themselves.
AIO manufacturers use a mix made specifically to handle mixed metals and bio inhibitors.