AFAIK, LPDDR5X is measured in terms of 16-bit per channel (and LPDDR6 is 24-bit per channel). So, why not state it in terms of bits to make it absolutely clear? In this case you would state it as 128-bit.
QuoteAsus ExpertBook Ultra B9406CAA
Intel Core Ultra X7 358H, Arc B390 Panther Lake iGPU
117245 MB/s
128-bit checks out with what is measured by AIDA64.
136528 MB/s (theoretical maximum) = 128 (8[or state octa-channel]*16-bit) * 8533 MT/s / 1000 / 8.
Sorry, I meant in bits, not bits per channel, as the bits per channel vary depending whether it's LPDDR5(X) or DDR5.