Finally 12 GB VRAM on a 128-bit bus?

en.wikipedia.org/wiki/GeForce_RTX_50_series#Mobile
RTX 5050, 5060 and 5070 have a 128-bit bus width. It does make most sense to connect the 3 GB dense chips to the fastest 128-bit GPU chip (5070).

3dmark.com/search - Steel Nomad:
5070 Laptop (8 GB VRAM, 128-bit bus width): Average score: 2985
5070 desktop (12 GB VRAM, 192-bit bus width): Average score: 5304

While the current 12 GB VRAM gaming laptops use the bigger, faster and more expensive 192-bit GB205 GPU, many games at settings where 8 GB VRAM becomes the limit, would run much better, if 12 GB VRAM was available.

Laptops using the 192-bit GB205 GPU are most of the time big, heavy, and expensive. The ones with the smaller chassis are even more expensive and may still have a loud(er) fan (because the chassis is smaller) and/or higher temperatures (there's no free launch).

128-bit/32-bit per GDDR7 chip = 4 GDDR7 chips, each 2 GB = 8 GB VRAM (current).
192-bit/32-bit per GDDR7 chip = 6 GDDR7 chips, each 2 GB = 12 GB VRAM (current).
128-bit/32-bit per GDDR7 chip = 4 GDDR7 chips, each 3 GB = 12 GB VRAM (new).

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5090 MaxQ (=300W TDP) 48 GB VRAM desktop GPU using 3 GB chips when, tho? Asking the real questions.