WD Datacenter Gold 2TB Drives

Hi

I have an older Dell MD1000 Array, which has a 3 GB/s backplane.
It Dell says it officially support 2TB drives, so my question is:

Does anyone know whether the WD Datacenter Gold 2TB drives (WD2005FBYZ) which has 6 GB/s interface, have the ability to scale down automatically to 3 GB/s when put in a device that only has a 3BG/s interface?

Thanks in advance.