AMD Radeon HD 6390 's Advantages
Lower TDP (39W vs 185W)
AMD Radeon HD 7870 XT 's Advantages
Released 1 years and 4 months late
Boost Clock975MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (192.0GB/s vs 16.00GB/s)
1216 additional rendering cores