AMD Radeon HD 7990 's Advantages
Larger VRAM bandwidth (288.0GB/s vs 224.0GB/s)
768 additional rendering cores
AMD Radeon Pro 5300 's Advantages
Released 7 years and 4 months late
Boost Clock has increased by 65% (1650MHz vs 1000MHz)
More VRAM (4GB vs 3GB)
Lower TDP (85W vs 375W)