Consider that now is the time when manufacturers are putting memory test utilities into firmware and that intersects with systems coming with 4-8-12GB of memory that take can take multiple hours to fully test. I would say its worth it.
If the Mac detects a bad DIMM it locks it out and informs you which one. You don't have to have do the RAM shuffle to find out which one is the bad DIMM. Your computer also doesn't crash because of it (it shouldn't but I've seen instances where even ECC couldn't recover).
If the Mac detects a bad DIMM it locks it out and informs you which one. You don't have to have do the RAM shuffle to find out which one is the bad DIMM. Your computer also doesn't crash because of it (it shouldn't but I've seen instances where even ECC couldn't recover).