WEBVTT

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so the conventional wisdom at least used to be that when you were shopping for a

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power supply you could basically judge the quality by the weight

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the heavier the power supply the better it probably was

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that is until some cheapo manufacturers started literally putting hunks of metal

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in them to make them seem better that got us thinking

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what about hunks of metal could you literally walk down the cooling aisle

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with a luggage scale and buy the heatsink with the best price to weight

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ratio to cool your CPU

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maybe

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g skills km780r mechanical keyboard features a brushed aluminum top plate on

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the fly macro recording and various cherry mx keyswitch configurations learn

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more at the link below we know

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more weight or mass if you want to be pedantic about it does not mean better

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cooling a two kilogram block of aluminum

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on top of a CPU would weigh a lot but

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wouldn't do a good job of cooling it down

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for long so what you're actually after

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when it comes to dissipating heat is

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surface area the more surface area that you have the more cooling will be

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available so then if we assume that most

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commercial CPU coolers are designed by mechanical engineers and not by

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chimpanzees and that most companies are

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interested in saving cost while optimizing performance then it would

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make sense that most heat sinks out there represent the manufacturer's best

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efforts to strike a balance between material cost and heat dissipation

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so assuming that everyone has done their homework equally the heavier the cooler

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the higher the performance should be but

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as we know so very well around here not

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all engineering is equal so we grabbed a

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bunch of coolers off the shelf and devised a test the weight of each cooler

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was recorded with the fan but without

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mounting hardware we kept the room at a consistent 24 degrees celsius and set

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the fan curve to full speed on our system for all of our tests the CPU we

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used was a core i7 7700k with the ida 64

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fpu test running for 30 minutes before the average package temp was taken for

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the next five and looking at the results there are actually some very interesting

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takeaways here first of all the nhd50 outperformance of

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every aio liquid cooler is a great testament to how well engineered it is

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and while we're praising strong products for

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their efficiency Corsair's dual 140

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millimeter aio outperforms the thermaltake triple 120

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aio which has worse case compatibility

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if i had to hazard a guess here though i'd say that this is down to the similar

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surface area of these two layouts and the design of the fans the most striking

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thing about these results though is that after a weight of about 400 grams the

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heat transfer to weight ratio

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plummets with the coolers that remove the most heat per gram being the

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lightest ones why is this

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well getting finally into the purpose of

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making this video to let alex nerd out for a bit it's actually because of a

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design concept called the infinite fin approximation basically for a fin of

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similar thickness material and airflow

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it can only get so long that is to say the distance from the

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heat source before adding more material is basically a waste this concept is

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illustrated using this graph where the y-axis represents heat flow

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one would be all of it and zero would be none

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so for an infinitely small fin you would dissipate zero heat that makes sense and

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for a mile long fin i mean by the tip of

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it practically all of the heat from the source would have been dissipated to the

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air before it could possibly be conducted there

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that is why in the early 2000s CPU

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coolers transitioned from thin or flower

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based designs to the heat pipe ones of the late 2000s and the liquid cooling

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designs that are common today so newer cpus generated more heat but

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they didn't get any bigger so there was no point in making the fins

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longer which means that these new high conductivity fluid based mediums

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heat pipes and water helped solve the challenge of moving the heat away to

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length optimized fins elsewhere

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is this something that we can show happening in real life

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actually yes the easiest way is by using this flear

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one thermal camera looking at the Noctua nhu12s

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the ends of the fins come in at about 38 degrees celsius

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14 degrees above the temperature of the room whereas on the massive

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nhd15 the fins are only about 31 degrees

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celsius and remember the lower the

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difference in temperature the slower the heat transfer

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so with a given heat load these longer fins

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are cooler and therefore are dissipating

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less heat per amount of material

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bringing us then finally back to our original question

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can you judge a cooler's performance by

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its weight well actually it turns out you kind of

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can surely there are some exceptions out

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there and some did better than others but everything we tested seems to have

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had some engineering thought put into it so that's good to know

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we are working with rosewill to give away nine that's right nine of their

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nebulous series gaming headphones they've got the gx10 gx30 and gx50

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models the gx10 features leatherette earcup cushions bright blue led

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backlighting around the earcups and compatibility with most devices not to

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mention a 25 price tag while the gx30

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and 50 both have detachable microphones as well as RGB lighting but the gx 50

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has 7.1 virtual surround so the gx30 is

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35 and the gx50 is 45 to purchase at the

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links below oh and also linked below is the link for the giveaway nine

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chances to win go check it out

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thanks for watching guys if this video sucked you know what to do but if it was

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awesome get subscribed hit that like button or check out the link to where to

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buy a cooler in the video description also down there is our merch store which

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has cool shirts like this one and our community forum which you should totally

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join