NVIDIA GeForce GTX 780 Rev. 2 's Advantages
Released 1 years and 5 months late
Boost Clock902MHz
More VRAM (3GB vs 1GB)
Larger VRAM bandwidth (288.4GB/s vs 38.40GB/s)
2160 additional rendering cores
NVIDIA GeForce GT 640 OEM Rebrand 's Advantages
Lower TDP (75W vs 250W)