Powering a 4-Pin stock CPU heatsink fan with an external power supply. This is a high-quality high static pressure fan from Corsair that looks beautiful and comes with three colored rings in red, blue and white, which you can change depending on your system color scheme or mood. User account menu. I think it would be better to suck the hot air out of the heatsink and case with a slot fan instead. Your manufacturing process and procedures should be developed to give those aspects first priority. So the simple answer is the coolest air, the best airflow and the least contaminate - only really answerable by investigation and experiment. Some math must be done to figure out the curve. If you suck out, air source is most probably located very close to PCB surface and other components, sucking accumulated dist from them. This ensures the thermal connection takes priority. The cartridge 14 may include one or more integrated circuit packages 24 that are mounted to a printed circuit board 26. OP, after seeing the case's fan layout, you definitely want to pull air up. Whichever fan you use will have its CFM drop the higher density of the Radiator/Heatsink. What should be the temperature of my computer processor. Put your hand behind and the effect is much harder to detect. The effects of turbulence are: So, turbulence is definitely NOT your friend. What is the difference between 'shop' and 'store'? Windows 7 PROFESSIONAL x64. 09 Apr 2012 #2: Moominen. Try it both ways and see if one works better than the other. The key is to find the correct ratio between the 'push' and 'pull' fans. The key is to find the correct ratio between the 'push' and 'pull' fans. A better design would have that area filled with metal in a rounded conical structure. Put you hand in front of the blow side and you will feel the airflow and cooling effect. Push-pull (mounting (a) fan(s) on both sides of a heatsink or radiator, all pointed in the same direction) increases the maximum velocity of the air moving over the heatsink or radiator's fins, allowing more heat to be transferred from the metal to the air, thus increasing the maximum cooling power of the heatsink or radiator. Experiment. Frank Whittle's PhD included using shrouded fans in his jet engine - very much more efficient than open propellors and good for rapid temperature rise to increase the exhaust gas velocity. Sandblasted aluminum, or gold coated sandblasted copper, if you can afford it, would work a lot better. It only takes a minute to sign up. thanks for the answer . This will lower the pressure inside the room and lower the temperature. Push Vs Pull - This depends on fan speed/power. Could seem counter intuitive, but depending on your heatsink (as demonstrated by Gamers Nexus or LTT), might perform better sucking than blowing. Should the "Pull" fan be a Static Pressure model or a High Airflow? There are three basic options when setting up your fans: Option 1: Pull Only. Whole house fans also exhaust warm air to draw in cool air from the windows rather than the reverse. In other words, is the pattern of airflow different enough to matter? I ran these in sli before but with 80mm fans #gpu doesn't get much air. It's recommended that people who use cases with rotated motherboards use blower-style cards instead of ones with aftermarket coolers. However, the NF-F12 at full speed produces so much static pressure that even a single fan can push the air through fin-stacks with wide to medium fin spacing (such as the one of the popular Noctua NH-U12P heatsink) very effectively. Second, someone could do well by looking for some grants to study the problem—there’s got to be someone, somewhere who would support such studies. The high speed fans at 2000RPM with a 38mm fan thickness provided the best performance in a push condition. This is a 5 minute video with all of my answers in it :) Heatsink fans. If your not sure just do both! Which means you want to use a higher RPM fan as the push and the LOWER RPM fan as PULL. And keep it clean. A rotary fan slapped on top of your typical linear finned heat-sink will actually be quite inefficient. Is there a word for an option within an option? Did I want the fan to blow air through the heatsink, or pull it off? You can spend thousands of dollars developing the perfect arrangement of fan and heat sink and it will all be for naught if you do not deal with the rest of the air around your cooling system, especially in a tight enclosure. I am scarred for life... Should have denied helping them, but I needed the cash at the time. ARCTIC F8 Silent - 80 mm Case Fan, very quiet motor, Computer, Almost inaudible, Push- or Pull Configuration, Fan Speed: 1200 RPM - Black, White 4.6 out of 5 stars 6,357 £3.95 Failing do to so will just recirculate the hot air and thermal failure will still occur on the device you are trying to protect. But the effect on electronic / electrical components that do not have water on their skins is zilch. For example: Bin lid to push vs a rope to pull = bin lid FTW. Turbulence is in fact your friend. Let’s first compare high speed fans – 1850RPM Push/Pull fans on our testbench (blue) vs 1800RPM Push fans on Martin’s bench (red): The numbers are relative performance compared to the best radiator. The main factors are: Thus I vote for inflow, but again, all depends on the device design. And the fill in a heat pipe tends not to be a good conductor or a good solvent (unlike water). Lenovo. The fan will perform a lot better moving the denser/cooler air to push the hot air out of the way than sucking up less dense/warmer air. Newegg shopping upgraded ™ It depends on what you are using to push or pull with. H60 3pin tach plugged into PUMP FAN. There is a lot of leakage around the push fan and some tape to seal the edges might help it. I have a fan on the rear of the tower that pulls air out and a power supply that consist of two fans, one on the bottom that pulls and one on rear that exhaust out as well. 1) (big) Fans at the INTAKE unfortunately PREHEAT the air by the friction and fan-motor heat dissipation MathJax reference. the effective area of the fan decreases - ask any prop-plane pilot Pump is SATA powered. But, you gave a solid answer. This question covered it for enclosures. Cheers. This is simpler (cheaper) to arrange with the fan between the vent and the heatsink. The case I'm using is a Silverstone FT02. It simply blocks the air movement, just like too fine features - air just to goes around the heatsink! If so, which one should I use? One is very likely going to work better than the other. Push + pull should increase airflow, but keep dead zones in mind. @ivan_pozdeev heat pipe is having some liquid inside anyway. Generally the push fans are high static pressure (usually 3-pin DC). As such, the boundary layer around heat transfer surfaces is thick, and heat transfer is rather poor. This of course is unfortunate, since that is normally where the thing you are trying to cool is located. Title is meant to say pull off btw . And it depends on fan construction. When sucked through fins, the pressure on the fins' surface orthogonal to the air flux will be higher. Should I have my CPU cooler fan push air away or pull air in? So the case (1) has poor heat transfer but better fan performance, and case (2) has better heat transfer but poorer fan performance. I have the Hyper 212+ and was wondering this. Amazon's Choice for "arctic f12 " Price: £4.49 & FREE Delivery on your first eligible order to UK or Ireland. Because hot air rises, if you're building a computer with additional fans on the top, those fans should blow hot air out of the case. Can I assign any static IP address to a device on my network? I thought that the problem with laminar flow over heat sinks was that close to the heat sink, you have a boundary layer of still air which acts as an insulator. Would it be better if I had the fan on the backside of the heatsink, pushing air through it or on the front of it pulling air through? For air cooling, air should be pushed through the heatsink by the fan, but for liquid cooling, pull config (fans pulling air through the radiator) seems to be slightly more efficient. To reset the processor fan push pins, remove the fan and reinstall it as shown below. FREE Shipping on orders over $25 shipped by Amazon. The Pi 4 needs a fan. (2) When a fan blows into the heat sink blades, the output air flow is turbulent, and thermal boundary layer around metal surfaces is thin, so the air flow penetrates deeper into fin structure and close to metal surfaces, providing good heat transfer. What would perform better, Noctua NH-D15 triple fan vs Corsair 110i Push/Pull on a I7 4770K overclocked to: Core 1: 4.6, Core 2: 4.6, Core 3: 4.5, Core 4: 4.5, Cache ratio 44 @ 1.35V. Home. It would fail to work after a period of time. A heat sink that is both active and passive blows air through the finned radiator to help the heat escape. Generally speaking, when a fan "pushes" ambient air into CPU, it creates more turbulence around sink's blades, which leads to better heat removal and smaller thermal resistance of the sink. Adding a second fan creating a push/pull system could yield as high as 5-6C decrease in temperature depending on the original size of the heatsink and the cooling air flow or air currents (directional flow patterns) inside your PC along with the rooms ambient temperature at the time. Which means you want to use a higher RPM fan as the push and the LOWER RPM fan as PULL. Water is a great danger in portable systems since they can be damaged. @Trevor Either I fail to read the question properly, or it indeed is just about the fan. Laminar flow is the most efficient means of convecting and conducting heat away. And when deeper than wider then blowing? So, it looks like the case (2) has clear advantage over case (1). Further, unless the fins are quite deep the airflow is badly distributed in general.$12.75 $12. The air flows across the channels 18 from the first fan 20 to the second fan 22 to remove heat from the heat sink 12. I presume that you're talking about integrated systems @ChrisH, I haven't seen that with after market coolers, where you don't have any guarantee about where your CPU is in relation to your case vents. I am on the side of pull air away. However, from the point of view of the fan attached to a heatsink does it matter whether air is blown through the fins, or sucked through the fins. Home. people change the cm evo fan for noctuas for a reason... or not? Heat pipes are not liquid cooling, the principle is different (the only thing in common is the use of a cooling agent). Jun 15, 2014 #4 hum so i found something interesting. Most of these people have no clue what they are talking about, Usually a CPU cooler fan sucks air from the side facing away from the CPU and pushes it against the heatsink as the CPU is cooled more efficiently this way, However, I have seen fans the opposite on occasion and there are always dual fan setups which can push, pull, or have 1 push, and 1 pull. How to label resources belonging to users in a two-sided marketplace? But I dont think only the rpm has to do with the amount of air the fan can push or pull with the noctuas. In the picture, the computer case sucks in cold air from the front to cool the internal components, and as the lighter hot air rises, it's eventually blown out the back. And they use a substance with a lower boil temperature rather than water. to source colder air and to outflow hotter air into intended direction. Press the push pins in the order shown to secure them. In most cases fan in suck mode is much better than blow mode. Pump is SATA powered. So the use of axial fan has some advantage in weak thermal case (1), while performance of the same fan is reduced by running it into a pressurized (but more thermally-efficient) area. I have to agree with @AliChen As I recall turbulence increases forced convection heat transfer. For a "fan on top of a heatsink" setup, the blow side definitely provides better cooling. The device transfers heat to the heatsink by conduction.The primary mechanism of heat transfer from the heatsink is convection, although radiation also has a minor influence.. TONS of people have asked me about fan configurations for radiators and heatsinks. Corsair Air Series SP120 High Static Pressure Fan is one of the best static pressure fans that you can get your radiator, heatsink or PC case. When the air flow increases, you may eventually reach a point where the airflow becomes turbulent. Buy ARCTIC Freezer 34 eSports Edition - Tower CPU Cooler with Push-Pull Configuration, Wide Range of Regulation 200 to 2100 RPM, Includes Low Noise PWM 120 mm Fan - Red with fast shipping and top-rated customer service. I thought that the reason they did this was to break up that boundary layer air and get the airflow closer to the heat sink itself. And you didn't mention heatpipes. And the highest [turbulent] air velocity is around the center of sink, where the thermal "stress" is highest. A contaminate the size or a grain of salt, or even a stray hair, can cause thermal failure. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. 2. Obviously, the best result can be achieved with a dual-fan design, like this one, where one fan blows in, and another suck the air out. It is therefore prudent to design your fan and heat-sink arrangement to be as self flushing as you can. A typical configuration is a back fan blowing air out, with a fan in the front sucking in cool air. I work for an Optical Networking (Telecom) technology company, and always dealing with cooling and EMC. This heating effect is altered by the P.dV/dt term, which is not zero. Push-pull fan configuration will allow you to get even better thermals and make sure you squeeze some more MHz out of your hardware. I was wondering what the feasibility was of flipping the fans on my GPU around so that they "pull" air through the heatsink, rather than "push" air on it. In fact the region directly under the centre of the fan will get virtually no air movement at all. Limited Time Deals. Generally, either way, you have an inlet and outlet. I'm thinking pushing air away to the top of the case would be good but the fan came pre installed where it was pulling air into the cooler. Excellent comments for a basic design decision for card/shelf based equipment question - to put the fans at the air filter intake or exhaust side. To overcome this loss and thereby increase the effectiveness of the fan, the better designs have close-fitting shrouds around the tips of the fan blades. 4.7 out of 5 stars 14. A heat sink and fan (HSF) is an active cooling solution used to cool down integrated circuits in computer systems, commonly the central processing unit (CPU). Last edited: Nov 22, 2008. i_am_alex, Nov 22, 2008 #1. ugc Regular member. @Andyaka usually the heatsink covers the chip enough for it not to matter. This effect is overcome on aircraft and large ship propellors by varying the 'pitch' of the blades, including reversing pitch. The dust reminds me of a customer who smoked indoors by their PC. That's a whole lot of the radiator (or heatsink for air cooling) that's not getting any air over it. Or think the pressure the mass interacts with heat per unit time, which is being refreshed by airflow rate. Components not properly mounted to the heat-sink with an appropriate thermal bonding material kills more units than the rest of the issues combined. To be tested. Kinda hard to get enough cooling otherwise. I thought that the reason they did this was to break up that boundary layer air and get the airflow closer to the heat sink itself. Which do I recommend? The instructions say blow air onto it using a 80mm fan to move air through the fins. Too shallow, and the resultant back-pressure can actually "stall" the fan. So, the equation simplifies to: In other words, if you increase the pressure over time the temperature will rise, and vice versa. Turn the push pins clockwise 90 degrees to reset them. @MarkBooth A lot of CPU coolers I've seen recently arelined up with a vent in the case so they draw outside air into the case and directly over the heatsink. Cooler Master MasterAir MA410M Addressable RGB CPU Air Cooler w/ Independently LEDs, 4 Continuous Direct Contact 2.0 Heatpipes, Aluminum Fins, Push-Pull, Dual MF120R 120mm Fans, AMD Ryzen/Intel1151 Series: MasterAir MA410M This gives: $$V \frac{dP}{dt} + P \frac{dV}{dt} = k \frac{dT}{dt} + T \frac{dk}{dt}$$. Reinsert the fan and find the push pins. Two other observations I have are This is usually not possible with the size of cooling fans used in electrical equipment. Dust and dirt is going to get into your fan and your heat-sink. This is such a wide subject it really isn't one you can answer with a simple one is better than the other answer. Pull is not generally designed for, and would actually not cool it as well as you would draw air more in from the sides of a heatsink more than pull air over the fins of the heatsink. was - C$179.99 | 38% OFF. Rear case fan<<<<