Intel Core i5 5200U 's Advantages
Lower TDP (15W vs 28W)
Intel Core i5 8259U 's Advantages
Released 3 years and 3 months late
Higher specification of memory (DDR4-2400 vs DDR3L-1600)
Larger memory bandwidth (37.5GB/s vs 25.6GB/s)
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (2.3GHz vs 2.2GHz)
Larger L3 cache size (6MB vs 3MB)