AMD Radeon HD 6990M 's Advantages
Lower TDP (100W vs 145W)
AMD Radeon RX 6800M 's Advantages
Released 9 years and 10 months late
Boost Clock2390MHz
More VRAM (12GB vs 2GB)
Larger VRAM bandwidth (384.0GB/s vs 115.2GB/s)
1440 additional rendering cores