I have the kit version with two SO-DIMMs (CT2K16G56C46S5) and they work fine, at 5600MT. These are pretty basic JEDEC spec parts, so one would expect them to just work. I bought mine directly from Crucial page.
As for the performance difference against CL40 parts like the Kingston, I imagine some latency sensitive apps (mostly games) might see some difference, but I highly doubt most productivity apps will care. iGPU tends to care more about bandwidth than latency, but again, there will always be outliers.
I personally don’t care that much, and Crucial kit was… “priced right.”
I got my Ryzen 7840U DIY unit last week and had my other components lying around for a bit:
WD SN850X 2TB
2x32GB Kingston Fury Impact (KF556S40IBK2-64) → SK Hynix dies
Windows 11 Pro
I can confirm that the RAM runs at 5600MT/s and CL40! This kit seems to be one of the fastest available. Highly recommended, especially this capacity. That should keep the laptop running for quite a bit.
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The previous generation of processors from both Intel and AMD only officially supported 4800 MT/s ram.
If you install 5600 MT/s ram into a laptop with a processor that only officially supports 4800 MT/s then the ram will be automatically slowed down to 4800 MT/s by default.
I strongly suspect that the reviews you’re seeing are from people with laptops with previous gen processors. Users have reported that on the AMD Framework 13 the Kingston 5600 MT/s modules run at the full rated 5600 MT/s.
The only difference in those 2 I can spot is that the latter has less Cac latency (CL 40-40-40) but then supports dual-channel and is more expensive?
The one I’ve found started Cac latency with(CL 46-45-45) but doesn’t state dual-channel support but Intel XMP.
As per framework description XMP is not supported anyway but then only applies to Intel or did I get that wrong
All ram supports dual channel. You just need 2 sticks of it and a CPU/motherboard that supports dual channel.
A lot of ram has both a default/JEDEC speed (which is a super stable and low power speed that the ram supports) and an XMP/EXPO speed (which is sometimes a much faster speed that may sacrifice stability or battery life).
When Framework says they don’t support XMP/EXPO they mean that ram with XMP/EXPO should only operate at its default/JEDEC speed when used in a Framework laptop.
Some DDR5 modules (including the ones you’re looking at) support XMP/EXPO but have an XMP/EXPO speed that is identical to its default/JEDEC speed. So the ram running at its default/JEDEC speed is fine.
The reason the ram has this is because previous generation CPUs didn’t support fast default/JEDEC speeds. So if you got 5600 MT/s ram but put it in a laptop with a previous generation CPU then it would only run at 4800 MT/s, however if you then went into the laptop settings you could enable XMP/EXPO (assuming the laptop supports those) to unlock the full speed.