NVIDIA GeForce GTX 970 's Advantages
Released 2 years and 5 months late
Boost Clock1178MHz
More VRAM (4GB vs 1GB)
Larger VRAM bandwidth (224.4GB/s vs 38.40GB/s)
1520 additional rendering cores
NVIDIA GeForce GT 640 OEM Rebrand 's Advantages
Lower TDP (75W vs 148W)