AMD Radeon E9550 MXM 's Advantages
Boost Clock has increased by 24% (1266MHz vs 1024MHz)
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (160.0GB/s vs 14.40GB/s)
1920 additional rendering cores
AMD Radeon 620 Mobile 's Advantages
Released 2 years and 8 months late
Lower TDP (50W vs 95W)