AMD Radeon R9 390 X2 's Advantages
Released 1 years and 10 months late
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (345.6GB/s vs 14.40GB/s)
2176 additional rendering cores
AMD Radeon R5 240 OEM 's Advantages
Boost Clock780MHz
Lower TDP (50W vs 580W)