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I always thought that when it comes to water cooling more is automatically

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better that is to say if one radiator is not enough you can just add another one

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or another two to get better performance well it seems that I've been water

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cooling incorrectly for years or at

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least that's what Coursera leads me to believe like what how could that

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possibly be that adding more radiators wouldn't help I just can't believe that

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to find out exactly what they said to me you're gonna have to sit through the

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segue to xsplit makes powerful streaming PC apps for streamers vloggers and more

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learn more at the end of the video

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when we showed our concept cooling system for our hack Pro 2019 with a

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front intake radiator and a rear exhaust radiator Corsair emailed me to say that

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according to their simulation data that second radiator would be at best

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pointless and could even make our cooling worse because it adds more

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airflow resistance and because I mean think about it the second radiator can't

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cool water with hot air from inside the

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case I ignored them and then when we showed off Jake's custom minecraft

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server that used not one not two but three thick alpha cool radiators stacked

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against each other with layers of Noctua eighty millimeter fans in between course

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I reached out again to admonish me for

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water cooling wrong the problem is like guys my experience tells me that

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stacking radiators works great or at

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least I thought it did I've never done a side-by-side comparison it makes sense

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though like you would think that doubling the surface area radiating heat

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away from the system must lead to if not

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double than at least significantly better performance but guys turns out

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it's not that simple in order to dissipate heat in a water cooling system

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there needs to be a difference in temperature across the materials in your

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heat exchanger in this case that's the ambient air which is cooled and the

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water which is warm from your components and then this is really important the

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greater that difference in temperature the more heat can be exchanged and the

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thing is because modern radiators are so

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efficient as Corsair if the water temperature is let's say 40 degrees

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under load we can bet that the air coming out of that rad is going to be

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just below that meaning that by the time it picks up some extra heat from air

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cooled components like motherboard VRMs it's not gonna have any heat capacity

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left to pull heat from a second radiator

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that it's going through that kind of makes sense but I wasn't ready to give

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up yet so to determine once and for all

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if adding a second rad is useless we decided to build a test rig

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call and got to work and piece together there it is that little tower sporting

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an RTX 2080 TI and Intel's 9900 KS or as

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I like to call it my little furnace together this pair can draw a little

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over 400 watts of power under a synthetic load and all that heat is

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going right into our water bt-dubs guys

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if you like water loops get subscribed we're planning to water cool a gaming

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chair and you're not gonna want to miss that if you get warm in the summer so our first test is to establish a

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baseline with a single 240 millimeter rad upfront pulling air in to be

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exhausted out of the top of the case with a second pair of matching fans the

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system stays cool enough not to thermal throttle but it's also obvious that our

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radiator is up against its limit so according to my common-sense PC building

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wisdom this system would have looked like a perfect candidate for just

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throwing another radiator at the problem with that out of the way then it's time

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to plumb up our second rad in series and put it in the top of the case with more

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or less the same fan configuration now we did end up having some RAM clearance

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issues requiring us to put the fans on top of the case but that should not

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negatively impact our data the important thing is that the radiator is still

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inside the case exposed to all the other heat sources that are in there now for

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the moment of truth our stress test was designed to hit both the CPU and

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graphics card with fir mark while logging all the pertinent data using

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hardware info that means not just temperatures but also power consumption

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and clock speeds in each scenario the

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system was allowed to hit a steady-state and then we stopped the loads and let

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the system cool back down to our idle temperatures let's look at the numbers

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popping right into the GPU temps the redline is with the single rad and the

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green line is with our dual rad setup not only did our dual rad setup take way

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longer to reach its max temperature it also ran way cooler about 20 degrees

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cooler in fact so that's it Corsair your

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myth is busted and a video I'm out just

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kidding we did our due diligence and check the CPU as well to make sure that

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both loops were actually experiencing the same load and they were both

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scenarios had the CPU clock between 4.5 and 4.6 nothing out of the ordinary

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there and our power usage looked nearly

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identical as well so then why didn't our

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results match Corsairs claims to be clear guys I'm not saying that they're

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CFD analysis or their real-world testing is wrong or that what they said doesn't

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make sense and let's remember as well

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they didn't actually critique this exact build all I'm trying to say is that this

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kind of simulation rarely translates perfectly to the real world and also

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that you should go delta-t sir calm ok no that was an aside so our working

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theory is that the openings in the case at both the back and the bottom allowed

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for some fresh ambient air to come in and mix with the hot air before being

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pulled up through the second read now if we had sealed off every potential air

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leak it's possible we would have seen something closer to Corsair simulation

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but as far as we can tell that's just not a true representation of the real

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world I mean nobody would do that another thing to consider is that every

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system is a little different fan orientations fan speeds radiator

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placement pump flow rates case designs all these things will affect how a

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cooling system works as we've seen with the minecraft server and the hack probe

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sometimes the truth of the matter is you've just got to work with the space

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you've got and we also did another sanity check we had Jake remove one of

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his stacked radiators which ended up resulting in a 5 degree increase in

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temps under load that's another proverbial nail in this coffin now I'm

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sure that in some rare cases it could actually be a negligible or a bad thing

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to add a second radiator but a blanket statement saying that stacking rads is

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bad just isn't even nearly true and you

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should really look at your particular use case and evaluate for yourself if

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you can so the moral of the story here is take everything with a grain of salt

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including what I'm saying right now do your own research and do a little

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benchmarking on your phone on your phone on your own it's easy free fun and can

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tell you loads about how to make your system work best for you so that's it if

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you guys want to check out some more benchmark related videos why not take a look at the video we did last year about

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finding out if your gaming rig is bottlenecked we're gonna have that

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linked in the end screen for you thanks to xsplit for sponsoring today's video

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