ATI Mobility Radeon HD 5830 's Advantages
Released 1 years and 4 months late
More VRAM (1024GB vs 512GB)
480 additional rendering cores
Lower TDP (24W vs 110W)
ATI Mobility Radeon HD 3870 X2 's Advantages
Larger VRAM bandwidth (54.40GB/s vs 25.60GB/s)