ATI Radeon HD 4870 X2 's Advantages
Larger VRAM bandwidth (115.2GB/s vs 48.00GB/s)
160 additional rendering cores
AMD Radeon 550X 640SP 's Advantages
Released 9 years and 8 months late
Boost Clock1071MHz
More VRAM (4GB vs 1GB)
Lower TDP (50W vs 286W)