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here we have the new M1 MacBook Air and this is the new Macbook Pro externally

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they differ very little brighter screen here a fan there but under the hood

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these two machines have exactly the same processor with just one catch because

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there's no fan in the MacBook Air its only way of cooling is passively

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radiating heat away and once the cooler has soaked up all the heat it can handle

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it's got to slow down the processor to keep itself safe but never fear because

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for about $30 I'm going to show you how to make this perform just like this or

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maybe even

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better by forcing air across the heat sink inside the MacBook Pro is able to

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maintain its performance better because it's actively removing heat from the

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system enclosure the MacBook Air on the other hand and as counterintuitive as

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that might sound it's got air right in the name has no air flow and uses a

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completely passive cooling solution so

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in Le of a fan Apple's Engineers opted to use a large heat sink inside which is

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essentially using the thermal mass of a block of metal to soak up the heat and

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then passively radiate it away through air channels below the screen and for

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short bursty workloads this isn't a problem that thermal mass is able to

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contain the short spike in heat output

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unfortunately when it comes to longer workloads the heat sink well heats up

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essentially filling up its thermal tank until it's at equilibrium with the CPU

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with no way to further remove heat the air will reduce its clock speeds and

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slow itself down so that the heat input matches the heat output and we can see

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this when we Benchmark these two machines side by side if the Benchmark

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is relatively short meaning that it doesn't heat soak the cooler both

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machines perform nearly identically coming within margin of error in terms

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of performance but when we get to more extended workloads the performance Gap

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widens significantly let's take a look at how

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it works here is the CPU and this over

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here is the heat sink all the heat the CPU generates is transferred into this

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heat sink and then the only place it can go is radiating around inside the

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chassis except for one exception it can

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actually waft this Gap at the back of

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the machine right here but that ain't much so it stands to reason that if we

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can improve the ability of the heat sink to get that heat out of the system we

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could improve the performance of the CPU but besides the low hanging fruit of

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like slapping a water block on it with like tubes and a radiator hanging off of

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it and calling it a day what can we do if we don't want to make permanent

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unwieldy modifications well that I'm

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glad you asked is where these come in these are thermal pads and they're

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designed to move heat around this this one is really squishy that is a fat

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thermal pad anyway all we have to do is slap these bad boys between the heat

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sink and the bottom of the chassis and we'll turn the back panel which

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conveniently is made of aluminum which happens to be great for dissipating heat

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into one big heat sink as it turns out

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all we need to do to make room for it is take off this insulating sponge right

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here see you later easy peasy but how

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does it perform well we already ran the benchmarks and the improvements are

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nothing short of amazing in bursty loads

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we saw essentially the same scores within our margin of error but on

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moderate to Long benchmarks we got a remarkable result up to an 8%

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Improvement even more impressive is that on the standard length multi-course C

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bench we actually beat the MacBook Pro

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by nearly 100 points our Theory here is that the delay between the load being

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applied and the fans ramping up on the MacBook Pro actually leaves a gap in its

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performance that the air is able to take advantage of with its beefier heat sink

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which is the entire chassis of the device there's essentially no delay it

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just immediately shunts the heat out of the case hence the win but that win

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comes at a cost a dire cost Comfort

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because the bottom of our MacBook Air Saw temperatures Rise by 7 1/ 12° to 47°

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C now if you're an old fogy like me you might actually remember a story

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circulating back in the early 2000s about a researcher who managed to burn

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his uh how do you say delicate bits by

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means of a scalding hot laptop well I'm sorry to say the story is probably bogus

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because we couldn't find any actual first party reporting on it but

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nevertheless that is initely a danger so

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there's got to be some kind of Regulation around that right well yeah

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lots of them in fact but the most important is the international

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electrotechnical commission standards the safety standard for information

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technology equipment AKA laptops is this

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and it specifies the requirements for products to remain safe during both

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normal operation and abnormal operation

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the specs are pretty exhaustive so to

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keep it simple the limit for metal unco or anodized for normal use contact is

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55° C at an ambient temperature of 35°

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to get this temperature without using a heated chamber we can calculate it by

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taking the macbook's external temperature subtracting the room temperature then adding 35 so let's do

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the math our office sits at a ball KN 20° so for our stock macbook's Peak temp

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of 392 we subtract 20 for the room plus 35 bringing us to 54 1/ 12° that is half

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a DE below the IEC limit and this right

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here is exactly the trade-off that Apple's Engineers needed to make for the

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MacBook Air to operate fanless hats off

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by the way guys for hitting that Mark exactly doing the same math for our

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modified version means that we would be 7° over that threshold and that might

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not seem like a lot but the difference in temperature between threshold pain

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and maximum pain according to ASM is

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only 8° so that's from 48 to 56° we do

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have some leeway here because the numbers that we calculated are at an

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unreasonable ambient temperature at least for us but in actual use yeah this

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thing does get uncomfortably hot with the thermal pads like I could do a

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faster 30-minute blender render on my lap but I wouldn't want to and I'd wager

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that you wouldn't want to either so where does that leave us well the mod

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works it brings darn near MacBook Pro level performance to the MacBook Air at

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a cost of like 50 cents worth of thermal

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pads but it also comes at the cost of

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external surface temperatures and obviously we wouldn't warrant your

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MacBook once you've modified it in this way because we don't know exactly what

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the long-term effects would be even if we think that they would be minimal for

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a mod that is completely reversible though and cheap I don't see why you

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wouldn't do this as long as you use your common sense and uh don't burn your junk

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