DDR5 has more future promise, whether that's lower power, higher bandwidth, higher capacity, maybe lower latency too. There's something about DDR5 requiring ECC, but it's not clear if that includes actual CPU/OS reporting or if it's internally using ECC but with no error reporting.

But, I'm not sure how much of that shines through in the first DDR5 product vs mature DDR4 products. Now is the part of the cycle where the old memory is still high volume and the new memory is starting to ramp up; in not too long, we'll have the part of the cycle where they made too much of the old memory and prices drop and it's time to scoop up all the old memory you'll ever need.