NVIDIA GeForce GTX 580 's Advantages
Larger VRAM bandwidth (192.4GB/s vs 64.00GB/s)
128 additional rendering cores
AMD Radeon R7 340 OEM 's Advantages
Released 4 years and 6 months late
Boost Clock780MHz
More VRAM (2GB vs 1536GB)
Lower TDP (50W vs 244W)