

Well, it’s slower than what one could theoretically achieve if you could run that much at that rate. I believe that the MT rating is per stick and the memory is used interleaved, so it’s not that you put in 128GB and the overall throughput spanning all sticks drops, but rather that you won’t get the throughput that the more-expensive memory is rated for.
I have a Framework Desktop that’s running 128GB of soldered memory at 8000 MT/s. In contrast, my desktop can only manage 3600 MT/s on 128 GB of slotted DIMMs.
$ sudo dmidecode -t memory|grep Speed
Speed: 4800 MT/s
Configured Memory Speed: 3600 MT/s
























In general, one can swap in custom outer shells for controllers if one has a particular look in mind; there are stores that sell these.
In the case of the Steam Controller 2, Valve published the CAD files for the outer shell to actively try to encourage this, so I imagine that there will be replacement outer shells.