3 ms·

One of the advantages of soldering RAM is better signal integrity - shorter paths and easier routing, plus connectors tend to be awful for high frequency stuff.

by kimixa 5y ago

One of the advantages of soldering RAM is better signal integrity - shorter paths and easier routing, plus connectors tend to be awful for high frequency stuff. So I fear this isn't a "Better soldered RAM", as it may lack it's advantages.

nix23 5y ago
>One of the advantages of soldering RAM is better signal integrity Can you proof that?
- bogantech 5y ago
  Every connector has some amount of resistance (higher than a soldered joint) for example
  - nix23 5y ago
    Nothing todo with signal integrity.
    - bogantech 5y ago
      You don't think slew rate is important? Or impedance matching? Mismatched impedance will cause reflections, ringing etc
- kimixa 5y ago
  An example of DIMM vs non-DIMM (soldered) ddr signal integrity analysis is in here: https://www.signalintegrityjournal.com/articles/1731-signal-integrity-characterization-of-via-stubs-on-high-speed-ddr4-channels https://www.signalintegrityjournal.com/articles/1731-signal-... And the connectors aren't just increased resistance, but cause reflections of the wave. And surely the routing issues are self-evident? No constraints of pushing all the signals through a specific pinout edge connector. All that is (one of) the reason all gddr is soldered, and apple's M1 gets a super wide memory bus at low power by being even closer on-package.