NVIDIA GeForce GT 640 's Advantages
Lower TDP (65W vs 120W)
NVIDIA GeForce GTX 1660 Ti 's Advantages
Released 6 years and 8 months late
Boost Clock1770MHz
More VRAM (6GB vs 2GB)
Larger VRAM bandwidth (288.0GB/s vs 28.51GB/s)
1152 additional rendering cores