NVIDIA GeForce GT 640 's Advantages
Lower TDP (65W vs 215W)
NVIDIA GeForce RTX 2080 's Advantages
Released 6 years and 3 months late
Boost Clock1710MHz
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (448.0GB/s vs 28.51GB/s)
2560 additional rendering cores