←back to thread

Is an Intel N100 or N150 a better value than a Raspberry Pi?

(www.jeffgeerling.com)
276 points transpute | 2 comments | 04 Jul 25 12:08 UTC | HN request time: 0.001s | source
Show context
nottorp ◴[04 Jul 25 13:11 UTC] No.44464229[source]▶
> DDR5 SO-DIMMs are not compatible with DDR4 SO-DIMM slots—just something I learned on this project... I knew full-size DIMMs were incompatible due to the extra on-stick ECC circuit on DDR5 RAM, I just didn't know the same applied to SO-DIMMs. Obvious in hindsight, but something to keep in mind.

Umm... what?

replies(2): >>44464356 #>>44464922 #
Retr0id ◴[04 Jul 25 13:26 UTC] No.44464356[source]▶
Which part is unclear?
replies(4): >>44464419 #>>44464420 #>>44464820 #>>44465569 #
1. wtallis ◴[04 Jul 25 13:34 UTC] No.44464419[source]▶
The on-die ECC used by DDR5 (and pretty much all other recent DRAM) actually doesn't have many compatibility implications, precisely because it's done entirely on-die unlike traditional ECC memory modules that include an extra one or two chips to enable end to end ECC managed by the CPU's memory controller.

The more significant incompatibilities between DDR4 and DDR5 are in the power delivery (DDR5 has voltage regulators on the module rather than on the motherboard) and rearranging of the address bus and command encoding.

replies(1): >>44464885 #
2. Retr0id ◴[04 Jul 25 14:29 UTC] No.44464885[source]▶
Oh, right, yeah I see the meta-confusion. They are incompatible for a bunch of reasons, of which ECC is not particularly relevant.