alt Hacker News>The sad part is that DDR5 is the thing that doesn't need to be soldered, unlike GDDR. But then Apple solders it anyway.
Apple needs to solder it because they are attaching it directly to the SOC to minimize lead length and that is part of how they are able to get that bandwidth.
Systems with socketed RAM have had on-die memory controllers for more than two decades. CAMM2 supports the same speeds as Apple is using in the M5.