ATI Mobility Radeon HD 4670 's Advantages
Larger VRAM bandwidth (25.60GB/s vs 14.40GB/s)
Lower TDP (35W vs 50W)
AMD Radeon 620 Mobile 's Advantages
Released 10 years and 4 months late
Boost Clock1024MHz
More VRAM (2GB vs 512GB)
64 additional rendering cores