Unknown motherboard details
Unknown motherboard details
The person who gave it mentioned he had everything he could offer. I’m not sure how to correctly determine the mounting holes.
Without calipers, any tape measure or ruler with millimeter markings works. You can estimate from the middle of each hole—being off by just a millimeter won’t matter much. Do the CPU have a square or rectangular mounting? Many embedded boards use Intel’s standard 75x75mm spacing for compatibility, so a compatible LGA 115x cooler should fit. If they opted for Ryzen’s rectangular style, modern coolers would still work fine.
They obtain a ruler or measuring tape to gauge the space between screw or clip centers on the board. Use a ruler to check the heatsink dimensions (width, length). In extreme cases, you might need to drill holes for the clips. Then visit online electronics shops such as Digikey, Mouser, Newark or Farnell to find heatsinks that fit your motherboard’s specifications. For instance, on Digikey you can browse 39,000 items available: https://www.digikey.com/short/b5f7zrqt
The AM4 spacing measures 90mm by 54mm, which explains the compact design of this embedded system. It appears the heat sink in this socket is relatively tiny, raising concerns about its effectiveness. You likely won’t discover a standard CPU cooler that fits this dimension, so you might need to adjust your existing cooler by adding more aluminum or drill holes into a compatible enclosure like a Wraith Stealth. Alternatively, you could look for a heat sink from Digi-Key to meet your requirements.
It is very small. Just the main problem is that trying to find the right size of one and also one with the right connector since I haven't seen one of these before for a fan on a regular board. Below is a photo of cooler and board.
Locate the heatsinks in one area and the fans elsewhere. In shops that sell electronic parts, fans usually arrive without connectors (unfinished wires), since the manufacturer handles the connection. You can neatly trim the wires from the original fan and either solder them or twist the bare ends together, wrapping them with electrical tape. Search for "fan header pinout" online to understand each wire's function—it generally serves as a 5v/12v ground for the RPM sensor PWM. If your existing fan only provides 5v, you might skip using the fan header on the board, as it would also be single-phase. You can source 12v elsewhere, such as from a DC jack. If you manage to cut the wire in half and drill four holes, this setup would work well.
Note that this heatsink is built for attaching fans directly to its top; its vertical slots fit M3 screws with a spacing of about 35.6mm (1.4 inches). Most 45mm fans use 37mm spacing, while 50mm models typically have 40mm. You can mount a fan with just a screw, or use a larger fan on one side with two screws.
Alternative options include:
- 100 x 51 x 20mm (cut to 90x50mm)
- 300x45x10mm (cut to 90x50mm)
- 90 x 90mm (cut to ~90x50mm)
- 94 x 101 x 27mm (cut to 90x50mm)
Drill holes at 95x95x15mm, adjust to 90x50mm, or drill 4 holes in a 90mm piece. For more detail on mounting, see the linked resources.