geekworm raspberry pi 4 7mm embedded heatsink with fan (p165-a), raspberry pi 4b armor aluminum radiator with 5v cooling fan compatible with raspberry pi 4 model b computer and pi 4 geekworm <b>overview</b><br> why design this product?<br> 1. after the raspberry pi 4 was released, we found that the heat generation of pi 4 also increased greatly with its performance. we have encountered many times that pi 4 crashed due to excessive heat generation. this problem can be satisfactorily solved by use the raspberry pi 4 armor case with asin: if not use other pi 4 external expansion board.<br> 2. at the same time, we found that various types of raspberry pi 4 expansion boards such as dac+, ups hat, or various lcds on the market also encountered excessive heat generation when used on pi 4. so we try to solve this problem.<br> 3. we refer to the design of raspberry pi 4 armor case and simplified the design , so there is the birth of this embedded armor aluminum alloy heatsink radiator.<br> <br> <b>why is it compatible with the use of expansion boards?</b><br> the embedded armor aluminum alloy heatsink radiator is 7mm high (designed with negative tolerance) and is equipped with m2.5*5+5 copper spacers; so the total height is 12mm, which can support most of raspberry pi 4 expansion boards; if you use expansion board with other height, you only need to replace the copper spacers with the right height. (if you need a special height copper spacers, please contact us.)<br> <br> the raspberry pi hat positioning hole has internal thread for easy fixing from above or below;<br> compared to the raspberry pi pcb, the entire heat sink shrinks inward by 0.5 mm.<br> <br> <b>features:</b><br> only supports raspberry pi 4 model b;<br> supports to cooling down the raspberry pi 4 board when using the pi 4 expansion board;<br> equipped with a variety of screws and copper spacers; raspberry pi hat positioning hole is m2.5 internal thread; (this design is convenient to fix)<br> supports the installation of 25mm fans; cooling fan can be added when the heat dissipation of a single aluminum heat sink is not enough, so that all heat dissipation problems can be solved.