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). 5090 MaxQ (=300W TDP) 48 GB VRAM desktop GPU using 3 GB chips when, tho? Asking the real questions.
Lenovo has revealed details of four new Nvidia GeForce RTX 5070 12GB gaming laptops. At the same time, MSI is preparing to offer the same laptop GPU paired with Intel's new Core Ultra 7 251HX processor.
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