AMD Radeon R9 290X2 's Advantages
Released 1 years and 2 months late
More VRAM (4GB vs 3GB)
Larger VRAM bandwidth (345.6GB/s vs 288.0GB/s)
768 additional rendering cores
AMD Radeon HD 8990 OEM 's Advantages
Boost Clock1000MHz
Lower TDP (375W vs 580W)