While DDR6 RAM modules could reach 17.6 or even 21 Gbps speeds with overclocking, LPDDR6 modules used mainly for laptops and mobile devices would only cap out at 14.4 Gbps. Both standards will adopt the CAM2 form-factor, so desktop PC RAM modules would also connect in a parallel orientation to the motherboard.https://www.notebookcheck.net/DDR6-RAM-standard-to-launch-in-CAMM2-form-factor-with-speeds-between-8-8-and-21-Gbps.840140.0.html
Great for iGPU.
Gigabits/sec (Gbps) != Gigatransfers/sec (GT/s).
The memory speeds you're referencing as Gbps are actually GT/s, so the actual Gbps rate is much higher.