AMD Radeon R9 280 's Advantages
More VRAM (3GB vs 2GB)
Larger VRAM bandwidth (240.0GB/s vs 179.2GB/s)
512 additional rendering cores
AMD Radeon R9 370 's Advantages
Released 1 years and 2 months late
Boost Clock has increased by 5% (975MHz vs 933MHz)
Lower TDP (110W vs 200W)