Qualcomm Snapdragon 450 Advantages
Lower TDP (3W vs 9W)
Qualcomm Snapdragon 670 Advantages
Better graphics card performance FLOPS (0.3584 TFLOPS vs 0.1152 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 7.46GB/s)
Higher Frequency (2000MHz vs 1800MHz)
More modern manufacturing process (10nm vs 14nm)
Released 1 years and 2 months late