1
00:00:00,160 --> 00:00:07,279
so the conventional wisdom at least used to be that when you were shopping for a

2
00:00:04,480 --> 00:00:12,719
power supply you could basically judge the quality by the weight

3
00:00:09,760 --> 00:00:17,600
the heavier the power supply the better it probably was

4
00:00:15,040 --> 00:00:22,560
that is until some cheapo manufacturers started literally putting hunks of metal

5
00:00:19,920 --> 00:00:26,880
in them to make them seem better that got us thinking

6
00:00:24,080 --> 00:00:31,679
what about hunks of metal could you literally walk down the cooling aisle

7
00:00:29,519 --> 00:00:37,040
with a luggage scale and buy the heatsink with the best price to weight

8
00:00:33,840 --> 00:00:39,490
ratio to cool your CPU

9
00:00:37,040 --> 00:00:47,920
maybe

10
00:00:47,920 --> 00:00:54,320
g skills km780r mechanical keyboard features a brushed aluminum top plate on

11
00:00:52,320 --> 00:00:59,359
the fly macro recording and various cherry mx keyswitch configurations learn

12
00:00:56,559 --> 00:01:03,760
more at the link below we know

13
00:01:01,440 --> 00:01:10,159
more weight or mass if you want to be pedantic about it does not mean better

14
00:01:07,040 --> 00:01:13,520
cooling a two kilogram block of aluminum

15
00:01:10,159 --> 00:01:15,760
on top of a CPU would weigh a lot but

16
00:01:13,520 --> 00:01:20,080
wouldn't do a good job of cooling it down

17
00:01:16,880 --> 00:01:23,119
for long so what you're actually after

18
00:01:20,080 --> 00:01:25,759
when it comes to dissipating heat is

19
00:01:23,119 --> 00:01:29,200
surface area the more surface area that you have the more cooling will be

20
00:01:28,000 --> 00:01:34,720
available so then if we assume that most

21
00:01:32,000 --> 00:01:40,720
commercial CPU coolers are designed by mechanical engineers and not by

22
00:01:36,960 --> 00:01:43,040
chimpanzees and that most companies are

23
00:01:40,720 --> 00:01:47,920
interested in saving cost while optimizing performance then it would

24
00:01:45,439 --> 00:01:53,200
make sense that most heat sinks out there represent the manufacturer's best

25
00:01:50,880 --> 00:01:59,360
efforts to strike a balance between material cost and heat dissipation

26
00:01:56,960 --> 00:02:04,880
so assuming that everyone has done their homework equally the heavier the cooler

27
00:02:02,159 --> 00:02:09,360
the higher the performance should be but

28
00:02:06,000 --> 00:02:12,879
as we know so very well around here not

29
00:02:09,360 --> 00:02:14,800
all engineering is equal so we grabbed a

30
00:02:12,879 --> 00:02:20,800
bunch of coolers off the shelf and devised a test the weight of each cooler

31
00:02:17,360 --> 00:02:23,599
was recorded with the fan but without

32
00:02:20,800 --> 00:02:28,800
mounting hardware we kept the room at a consistent 24 degrees celsius and set

33
00:02:26,480 --> 00:02:35,680
the fan curve to full speed on our system for all of our tests the CPU we

34
00:02:31,599 --> 00:02:38,400
used was a core i7 7700k with the ida 64

35
00:02:35,680 --> 00:02:43,280
fpu test running for 30 minutes before the average package temp was taken for

36
00:02:40,480 --> 00:02:47,360
the next five and looking at the results there are actually some very interesting

37
00:02:45,760 --> 00:02:55,200
takeaways here first of all the nhd50 outperformance of

38
00:02:52,239 --> 00:02:58,879
every aio liquid cooler is a great testament to how well engineered it is

39
00:02:57,840 --> 00:03:04,159
and while we're praising strong products for

40
00:03:00,879 --> 00:03:05,800
their efficiency Corsair's dual 140

41
00:03:04,159 --> 00:03:12,879
millimeter aio outperforms the thermaltake triple 120

42
00:03:08,959 --> 00:03:14,720
aio which has worse case compatibility

43
00:03:12,879 --> 00:03:19,680
if i had to hazard a guess here though i'd say that this is down to the similar

44
00:03:17,280 --> 00:03:25,040
surface area of these two layouts and the design of the fans the most striking

45
00:03:22,319 --> 00:03:31,680
thing about these results though is that after a weight of about 400 grams the

46
00:03:28,080 --> 00:03:34,400
heat transfer to weight ratio

47
00:03:31,680 --> 00:03:39,120
plummets with the coolers that remove the most heat per gram being the

48
00:03:37,280 --> 00:03:42,000
lightest ones why is this

49
00:03:40,720 --> 00:03:46,560
well getting finally into the purpose of

50
00:03:44,000 --> 00:03:51,280
making this video to let alex nerd out for a bit it's actually because of a

51
00:03:48,879 --> 00:03:57,840
design concept called the infinite fin approximation basically for a fin of

52
00:03:54,400 --> 00:04:00,400
similar thickness material and airflow

53
00:03:57,840 --> 00:04:04,959
it can only get so long that is to say the distance from the

54
00:04:02,159 --> 00:04:09,920
heat source before adding more material is basically a waste this concept is

55
00:04:07,599 --> 00:04:16,160
illustrated using this graph where the y-axis represents heat flow

56
00:04:13,200 --> 00:04:20,000
one would be all of it and zero would be none

57
00:04:17,040 --> 00:04:26,880
so for an infinitely small fin you would dissipate zero heat that makes sense and

58
00:04:23,199 --> 00:04:29,520
for a mile long fin i mean by the tip of

59
00:04:26,880 --> 00:04:34,639
it practically all of the heat from the source would have been dissipated to the

60
00:04:31,919 --> 00:04:40,160
air before it could possibly be conducted there

61
00:04:36,479 --> 00:04:43,440
that is why in the early 2000s CPU

62
00:04:40,160 --> 00:04:45,919
coolers transitioned from thin or flower

63
00:04:43,440 --> 00:04:51,120
based designs to the heat pipe ones of the late 2000s and the liquid cooling

64
00:04:48,720 --> 00:04:57,360
designs that are common today so newer cpus generated more heat but

65
00:04:54,720 --> 00:05:02,560
they didn't get any bigger so there was no point in making the fins

66
00:04:59,840 --> 00:05:08,560
longer which means that these new high conductivity fluid based mediums

67
00:05:05,680 --> 00:05:14,960
heat pipes and water helped solve the challenge of moving the heat away to

68
00:05:11,840 --> 00:05:16,800
length optimized fins elsewhere

69
00:05:14,960 --> 00:05:20,400
is this something that we can show happening in real life

70
00:05:18,800 --> 00:05:24,479
actually yes the easiest way is by using this flear

71
00:05:22,800 --> 00:05:30,080
one thermal camera looking at the Noctua nhu12s

72
00:05:27,360 --> 00:05:33,680
the ends of the fins come in at about 38 degrees celsius

73
00:05:31,600 --> 00:05:41,280
14 degrees above the temperature of the room whereas on the massive

74
00:05:36,840 --> 00:05:44,800
nhd15 the fins are only about 31 degrees

75
00:05:41,280 --> 00:05:47,680
celsius and remember the lower the

76
00:05:44,800 --> 00:05:50,080
difference in temperature the slower the heat transfer

77
00:05:49,280 --> 00:05:56,560
so with a given heat load these longer fins

78
00:05:53,360 --> 00:06:00,000
are cooler and therefore are dissipating

79
00:05:56,560 --> 00:06:02,160
less heat per amount of material

80
00:06:00,000 --> 00:06:07,039
bringing us then finally back to our original question

81
00:06:03,919 --> 00:06:08,240
can you judge a cooler's performance by

82
00:06:07,039 --> 00:06:12,560
its weight well actually it turns out you kind of

83
00:06:11,360 --> 00:06:17,280
can surely there are some exceptions out

84
00:06:14,560 --> 00:06:21,919
there and some did better than others but everything we tested seems to have

85
00:06:19,600 --> 00:06:25,680
had some engineering thought put into it so that's good to know

86
00:06:23,840 --> 00:06:31,440
we are working with rosewill to give away nine that's right nine of their

87
00:06:29,039 --> 00:06:37,600
nebulous series gaming headphones they've got the gx10 gx30 and gx50

88
00:06:35,120 --> 00:06:41,759
models the gx10 features leatherette earcup cushions bright blue led

89
00:06:39,919 --> 00:06:47,039
backlighting around the earcups and compatibility with most devices not to

90
00:06:43,520 --> 00:06:49,680
mention a 25 price tag while the gx30

91
00:06:47,039 --> 00:06:56,720
and 50 both have detachable microphones as well as RGB lighting but the gx 50

92
00:06:53,120 --> 00:07:00,800
has 7.1 virtual surround so the gx30 is

93
00:06:56,720 --> 00:07:03,759
35 and the gx50 is 45 to purchase at the

94
00:07:00,800 --> 00:07:09,039
links below oh and also linked below is the link for the giveaway nine

95
00:07:05,919 --> 00:07:10,720
chances to win go check it out

96
00:07:09,039 --> 00:07:14,639
thanks for watching guys if this video sucked you know what to do but if it was

97
00:07:12,560 --> 00:07:18,639
awesome get subscribed hit that like button or check out the link to where to

98
00:07:15,919 --> 00:07:21,919
buy a cooler in the video description also down there is our merch store which

99
00:07:20,240 --> 00:07:26,000
has cool shirts like this one and our community forum which you should totally

100
00:07:23,759 --> 00:07:26,000
join