AMD Radeon HD 8970M 's Advantages
Boost Clock has increased by 44% (900MHz vs 625MHz)
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 72.00GB/s)
640 additional rendering cores
AMD Radeon E8860 's Advantages
Released 8 months late
Lower TDP (37W vs 100W)