AMD Radeon R9 M275 's Advantages
Boost Clock has increased by 1% (925MHz vs 920MHz)
Larger VRAM bandwidth (64.00GB/s vs 32.00GB/s)
320 additional rendering cores
AMD Radeon R7 M445 's Advantages
Released 2 years and 4 months late
More VRAM (4GB vs 2GB)