NVIDIA GeForce GTX 780 Rev. 2 's Advantages
More VRAM (3GB vs 2GB)
Larger VRAM bandwidth (288.4GB/s vs 80.00GB/s)
1920 additional rendering cores
NVIDIA T400 's Advantages
Released 7 years and 8 months late
Boost Clock has increased by 58% (1425MHz vs 902MHz)
Lower TDP (30W vs 250W)