NVIDIA GeForce GTX 580 's Advantages
Lower TDP (244W vs 375W)
AMD Radeon HD 8990 OEM 's Advantages
Released 2 years and 5 months late
Boost Clock1000MHz
More VRAM (3GB vs 1536GB)
Larger VRAM bandwidth (288.0GB/s vs 192.4GB/s)
1536 additional rendering cores