WEBVTT 00:00:00.160 --> 00:00:08.400 Have you ever had thermal issues with your computer and thought, 00:00:04.600 --> 00:00:10.639 "Wow, if only I could get a bigger fan, 00:00:08.400 --> 00:00:18.320 I might be able to put my side panel back on." Well, if that's the case, 00:00:14.240 --> 00:00:20.620 we've got the fan for you. And uh this 00:00:18.320 --> 00:00:30.800 thing is powerful. 00:00:30.800 --> 00:00:38.640 Synergy allows you to share your mouse and keyboard between multiple computers 00:00:36.160 --> 00:00:42.960 at once. Check it out now at the link in the video 00:00:40.200 --> 00:00:45.680 description. So, this right here is the Delta 00:00:45.800 --> 00:00:55.760 PFR912XH. Uh, let's let's call it the blowy matron. And at 00:00:51.719 --> 00:00:57.840 $55, it is the most expensive blow I've 00:00:55.760 --> 00:01:06.000 ever gotten. I mean, this thing is almost four times the cost of even a 00:01:01.840 --> 00:01:09.240 high quality normal consumer fan. So, 00:01:06.000 --> 00:01:12.479 can it possibly deliver four times the 00:01:09.240 --> 00:01:15.320 performance? Well, funny you should ask. 00:01:12.479 --> 00:01:23.119 Try more like seven times the performance. Ramping up to a whopping 11 00:01:19.479 --> 00:01:26.720 12,000 rotations per minute. In open 00:01:23.119 --> 00:01:31.119 air, Blow Matron can push a staggering 00:01:26.720 --> 00:01:34.240 90 L of air every second. But how would 00:01:31.119 --> 00:01:37.520 we actually demonstrate what that means 00:01:34.240 --> 00:01:40.200 in realworld terms? This thing not only 00:01:37.520 --> 00:01:45.840 spins faster than the engine of my Civic, it probably has more torque, too. 00:01:43.920 --> 00:01:51.000 If you were to get your finger in this thing, well, to put it lightly, you're 00:01:49.360 --> 00:01:56.479 going to have a bad time. Oh, disgusting. 00:01:56.479 --> 00:02:00.960 It's only getting on me. 00:02:00.960 --> 00:02:06.719 That's what happens when you put your finger in the leaf. Oh, we finally 00:02:04.960 --> 00:02:11.360 stopped it. jammed full of carrot. So then with all of that blowing power, we 00:02:08.720 --> 00:02:15.520 started to wonder, well, what are the realworld 00:02:12.680 --> 00:02:23.560 applications? So here's one. If you're really crunched for space in your case 00:02:18.560 --> 00:02:26.560 at 37 mm tall, the super tiny Noctua 00:02:23.560 --> 00:02:28.959 NHLi is about as small form factor as 00:02:26.560 --> 00:02:34.080 you can get for a heat sink. But of course, that comes with some trade-offs. 00:02:31.760 --> 00:02:40.239 mainly that you aren't supposed to use it on a high TDP, that is the thermal 00:02:37.040 --> 00:02:42.720 output CPU. But there's the way it 00:02:40.239 --> 00:02:48.560 suggests in the manual and then there's the Linus TechTips way. So, can this 00:02:45.280 --> 00:02:50.440 heat sink cope with a fully clocked Core 00:02:48.560 --> 00:02:55.440 i7 7700K? Well, actually, it's a 00:02:53.200 --> 00:03:00.680 surprisingly resilient little bastard and was able to keep our 7700 K running 00:02:58.319 --> 00:03:06.480 at full turbo speed under synthetic load. Though, it wasn't exactly 00:03:02.959 --> 00:03:08.879 comfortable at a maximum of 97° C. 00:03:06.480 --> 00:03:14.400 Fortunately though, our CPU won't have to run hot for long since good old blowy 00:03:11.280 --> 00:03:17.440 Matron is coming to the rescue. But how 00:03:14.400 --> 00:03:20.080 much of a difference does a seven times 00:03:17.440 --> 00:03:25.360 increase in air flow make for real world cooling? Well, Alex here is a great big 00:03:23.440 --> 00:03:29.680 cooling nerd. So, the first thing we're going to do is look at it from a 00:03:27.040 --> 00:03:36.319 theoretical standpoint. What is it that makes a heat sink remove heat from a 00:03:32.680 --> 00:03:38.959 CPU? And why does a bigger, better fan 00:03:36.319 --> 00:03:44.480 cool it more? To put it simply, there are three things that affect how much 00:03:41.519 --> 00:03:49.680 heat you can remove from your processor. the surface area that is responsible for 00:03:46.959 --> 00:03:55.200 cooling, the heat transfer coefficient of the process, and the temperature 00:03:52.400 --> 00:03:59.920 difference between the CPU and the surrounding air. Now, it's intuitive 00:03:57.680 --> 00:04:03.680 that increasing the amount of air over a heat sink will make it cooler. Think 00:04:01.920 --> 00:04:09.280 about putting your hand out of the window of a car. You go faster, you cool 00:04:06.400 --> 00:04:13.360 more. But how much can upping the air flow help your cooling? So to figure out 00:04:11.439 --> 00:04:17.600 how big of a difference this is going to make, we have to calculate the 00:04:15.280 --> 00:04:22.479 convective heat transfer coefficient of air or how much heat air can take away 00:04:20.160 --> 00:04:28.960 from an object which is approximately equal to this formula where h is the 00:04:26.240 --> 00:04:32.880 heat transfer coefficient and v is the velocity of the air. So, we know the 00:04:30.960 --> 00:04:38.560 knock to a fan pushes air at about 1 meter per second. And plopping that into 00:04:35.040 --> 00:04:41.919 the formula gives us an h value of 19.5 00:04:38.560 --> 00:04:46.160 while blowing matron pushes air at 3.6 00:04:41.919 --> 00:04:49.120 m/ second, giving us an h value of 25.8. 00:04:46.160 --> 00:04:54.320 But Linus, it's pushing the air 3.6 times faster. Why does it only make a 00:04:51.400 --> 00:04:59.759 25% difference to cooling? Well, you see, I was mathing the other day and 00:04:57.120 --> 00:05:05.880 this one friaking square root over the velocity kept kicking my ass. You get 00:05:02.560 --> 00:05:08.479 diminishing returns the faster the air 00:05:05.880 --> 00:05:14.720 moves. So, bringing it back to the real world then, can this be confirmed with 00:05:11.440 --> 00:05:18.400 the blowatron? Well, with it strapped to 00:05:14.720 --> 00:05:22.320 our NHL 9i under full load and ID of 64, 00:05:18.400 --> 00:05:24.000 the CPU maxed out at 73° C, leaving us 00:05:22.320 --> 00:05:31.120 lots of room for overclocking. By the way, this also amounted to about 30% 00:05:27.840 --> 00:05:35.039 cooler than the stock fan, close to our 00:05:31.120 --> 00:05:37.520 expected temperature reduction of 25%. 00:05:35.039 --> 00:05:40.919 And really, the LMG thermodynamics and precision pizza heating department 00:05:39.039 --> 00:05:46.479 considers anything within an order of magnitude a compelling victory. Of 00:05:44.080 --> 00:05:50.240 course, that compromised some of the space savings with our heat sink. 00:05:48.479 --> 00:05:54.320 Leading us then to another question. This video really turned into kind of a 00:05:51.840 --> 00:06:02.160 voyage of discovery. What's better, having a cooling solution that's 3/4 00:05:57.440 --> 00:06:05.280 fins or 3/4 a fan? Well, we tested it 00:06:02.160 --> 00:06:08.080 and in this situation, the fan actually 00:06:05.280 --> 00:06:12.080 still wins in cooling performance per height. Although it isn't all hunky 00:06:10.400 --> 00:06:16.080 dory. Strap one of these guys to your heat sink, you're off to the races with 00:06:13.440 --> 00:06:22.160 a chilly CPU. First of all, there is power delivery. That stock knock to a 00:06:18.319 --> 00:06:23.919 fan sips 0.14 amps at full load. The 00:06:22.160 --> 00:06:26.560 blowy matron on the other hand, well, you probably don't want to attach this 00:06:25.360 --> 00:06:31.919 thing to a fan header on your motherboard since it draws a whopping 4 00:06:29.039 --> 00:06:36.960 1/2 amps at full load, which is nearly enough to overwhelm this bench power 00:06:34.600 --> 00:06:42.160 supply. And of course, there's also the noise. The Noctua fan puts out 24 dB 00:06:40.000 --> 00:06:48.800 maximum, which is quieter than someone whispering in a library. Compare that to 00:06:44.960 --> 00:06:52.880 the 75 dB of the Delta, which is more 00:06:48.800 --> 00:06:52.880 comparable to an alarm clock. 00:06:53.440 --> 00:07:00.800 Synergy is a software download that solves the problem once and for all of 00:06:58.319 --> 00:07:06.240 having two keyboards and two mice on your desk if you have more than one PC. 00:07:03.759 --> 00:07:12.080 It lets you share a single mouse and keyboard between two or even more 00:07:09.240 --> 00:07:17.360 computers seamlessly, so you'll no longer get confused about which one is 00:07:14.560 --> 00:07:22.080 connected to which. They offer a basic and pro option with a one-time payment 00:07:19.919 --> 00:07:26.400 for lifetime access. And the features include uh clipboard sharing between the 00:07:24.400 --> 00:07:30.400 computers, dragging and dropping files between the computers, the ability to 00:07:28.080 --> 00:07:36.880 set up hotkeys, and more. And the best thing is that Synergy is 00:07:33.000 --> 00:07:38.400 crossplatform. Woo! PC, Mac, and Linux. 00:07:36.880 --> 00:07:44.400 So, use our link in the video description to get up to 50% off Synergy 00:07:42.039 --> 00:07:48.800 today. So, thanks for watching, guys. If you dislike this video, well, you must 00:07:46.400 --> 00:07:53.680 be in the like banana protection league or whatever the case may be because we 00:07:51.440 --> 00:07:56.080 we ravaged that thing. But if you liked it, hit that like button, get 00:07:54.800 --> 00:08:00.560 subscribed, maybe consider checking out where to buy the stuff we featured at the link in the video description. And 00:07:59.199 --> 00:08:05.680 also down there, we've got our merch store, which has cool shirts like this one, banana and carrot chunks not 00:08:03.680 --> 00:08:09.680 included, as well as our community forum, which you should totally join.