As we have explained in our " What is CPU thermal paste " article, it is essential to have thermal paste between the CPU and heat sink. Even if your CPU doesn't overheat and shut down immediately, its lifespan is going to be shortened considerably. If you're installing the default Intel or AMD heat sink fan for the first time, then there is no need to apply any thermal compound.
You can see the three grey stripes of pre-applied thermal paste in the image below:. If you're installing a stock cooler than has been used before or an aftermarket heatsink fan, then it's a must to apply thermal compound to the CPU before proceeding - Click here to learn how to apply CPU thermal grease. If exhaust CFM is greater, then you have negative pressure.
Neutral would be when intake and exhaust CFM are equal. This way, the air that enters your case goes through a filter first. When building your computer, be sure to configure your cooling system with the principles outlined above in mind.
Otherwise, you may end up with a toaster oven of a computer. Just be sure to avoid those tacky LED-equipped case fans in the office. Your negative pressure graphic is not likely as you would never exhaust out the front. A single exhaust fan with no intake fan is negative pressure. A single intake fan with no exhaust fan is positive pressure. Different flow affects dust build up just as much as the case and house itself.
You want as close to a laminar flow as you can get, which just means as smooth and unobstructed as possible. You really could have spent a little more time on this to make it easier to comprehend for the beginners.
Thanks for the feedback. The first image of the fan has been replaced. As for the pressure graphics, the arrows are supposed to represent pressure rather than airflow. Question here, how can you find out the cfm rating of the stock fans that come with a computer case?
Is there any software what I can install to get these ratings as most software just gives you if the fan is working or not and at what rpm.. I have a NZXT H case, it has 1exhaust on the back and 1 on the top aswell and i have a NZXT kraken x62 for cpu liquid cooling and the radiator is mounted at the front with 2 intake fans. So my question is, should i flip the top fan to be an intake and leave the one on the back as an exhaust?
Or just make them both exhaust? That is why all the perforated side plates and back plates are that way and the fans are mounted to be exhaust only. It works pretty well stock. Reversing would be bad as the 2 are so close together they would cancel each other out in a small area and give most of the case NO airflow. If you do add intake fans in front there is limited ventilation for them to bring in much air since the front panel is solid, and it will mess up the negative pressure design unless you upgrade to higher cfm exhaust fans too and since NZXT is also a fan maker these cases have AER f fans instead of generic cheapo fans.
There was only 1 mm exhaust fan mounted at the rear panel. This means I have positive pressure happening in my case. Should I add additional fans at the top of my case to help with proper air flow?
Imo this is hard to measure just by calculation because most of the cases would provide some restriction to the front intake due to the dust filters and stuff on the front panel which makes front fans less efficient — while at least the rear fan has no restriction since there are no filters on the back.
You are not alone. I have several pi's with DAC's Seems like there would be some out there to help folks who do more with pi's. It would be nice if the header wasn't soldered from the factory, as in the Zero. That way Hats could be installed underneath. What are the dimensions of the fan? I can't seem to find it anywhere, not even on the official page.
I just updated the post above with all the details and an up-close picture of the fan and a ruler , and it is 2. Has anyone else found a source for just the fan?
I might just have to buy the whole package and pull out the fan otherwise. Hi Greg, did you manage to find any? Exactly my need as well. I also need a bit bigger in size, i. The firmware control option for this fan just turns it on at 80C and then off again at 70C. I wrote a C program using the pigpio library to demonstrate PWM control of the fan.
It's quieter, more efficient, should extend fan and CPU life through less cycling, but still prevents throttling under full load in 25C environments. Testing, comments, and improvements are welcome.
Maybe it could become an option in a future firmware version. Please comment on Github. And just to give another update, here's a new version that doesn't use much CPU at all! How much power does it use? I just started with rpi, and found this pages, very informative, thank you! My observation with rpi4 that it draws mA when turned OFF os shutdown , and that is contradicting what you have measured with rpi3 10 mA.
I wonder if it is a design defect with rpi4 or something else. Look for one with a high air flow measured in cubic feet per minute, or CFM and low noise level measured in decibels, or dBA. Fans vary in size, speed, blade shape and color. Some fans even come with built-in LED lights, others are more performance focused such as this Noctua Chromax fan.
Larger fans can usually spin at lower speeds and still move plenty of air without making much noise. Some manufacturers incorporate LED lighting into their fans as well.
When adding fans to a system, maintaining positive pressure within the case can prevent dust from being sucked into any open holes or crevices. To maintain positive pressure, you need to have a higher combined CFM for the intake fans than the exhaust fans.
Note: Most fans have small arrows embossed on their frames that show the direction of air flow. When mounting, point the arrow towards the inside of the computer for intake, and the arrow towards the outside for exhaust.
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