WD RED old VS WD RED Benchmarks

I own 2 WD RED 2TB Hard drives listed below

CrystalDiskMark shows much slower speeds on the older drive 68AX9N0. Is this normal?
I get about 145MBps on the new one and 110 on the old drive. Now i have them on RAID 0 and i get decent speeds but im wondering... Does 3 years slow down a HDD or is it just a different batch?

Some more info from CrystalDiskInfo
power on count: 2018
power on hours: 8594

power on count: 24
power on hours: 193
Reply to badflasher
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  1. Best answer
    Different batch and judging by the speed increase i would say the new drives are using a denser platter with more refined heads (to read the higher density)
    Reply to popatim
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