AMD Radeon E9260 PCIe 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (112.0GB/s vs 48.00GB/s)
256 additional rendering cores
AMD Radeon RX 640 Mobile 's Advantages
Released 2 years and 8 months late
Boost Clock has increased by 2% (1218MHz vs 1200MHz)
Lower TDP (50W vs 80W)