Bandwidth on the macs is pretty good. M2 = 100GB/sec peak, M2 pro = 200GB/sec peak, M2 Max = 400GB/sec peak. A $3k lenovo thinkpad p16 uses DDR4-4800 or 76.8G

Bandwidth on the macs is pretty good. M2 = 100GB/sec peak, M2 pro = 200GB/sec peak, M2 Max = 400GB/sec peak. A $3k lenovo thinkpad p16 uses DDR4-4800 or 76.8GB/sec peak. That also ignores the arm relaxes memory model, which means you get (on average) a greater fraction of peak bandwidth when running something memory intensive. So apple does 1.3x, 2.6x, or 5.2x better. On a desktop you can get another 2x with the M1 Extreme. Seems quite a bit better than "Pretty ok", it's a big part of why the apple's get great GPU performance compared to Intel/AMD laptops with an iGPU and run at a small fraction of the power of the dGPUs used in laptops.