Memory Advice for a laptop
It looks like you're considering purchasing a 16GB R2x8 SSD from Sk Hinyx at a low price. That could be a good deal if the condition is solid.
The part number is likely acceptable at these low speeds.
The part number is Hynix HMA82GS6AFR8N
Hynix looks pretty bad too, so I don't think it'll be an issue combined with C die