Getting the form factor, pin count and frequency right the first time avoids returns and support tickets.
DDR3, DDR4 and DDR5 SODIMMs share a footprint but not a slot: 204 pins for DDR3, 260 for DDR4 and DDR5, and the notch sits in a different place on each. A module that physically fits is not proof of compatibility — check the generation your platform supports before anything else.
Rank and organisation matter as much as capacity. A 2Rx8 module can be invisible on chipsets that only address single-rank SO-DIMMs, and some thin-and-light platforms cap total memory well below the module's rating. Where the platform allows it, prefer 1Rx8.
Finally, plan for downclocking. A DDR5-5600 module in a 4800-rated platform runs at 4800 with looser timings, which is normal and not a fault — but it does need explaining to end customers. Ship with the JEDEC profile documented, and burn-in test every batch before it leaves.
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