WD Blue HDD low speed

Hello guys.
Recently I bought a new WD Blue WD20EZBX and Seagate Barracuda ST2000DM008, both 2TG, 7200 RPM, 256 MB cash.
But read/write speed completely different!
Seagate double faster.
Crystal Disk utility test for both:
WD test
Seagate Barracuda:
seagate test
Help, WD data sheet for WD20EZBX show speed must be 215 mb/s!

try a different SATA cable