WD2000FYYZ (WD RE) or WD20EFRX (WD Red)

[Dynomight]

I am planning a RAID 0 (4 HDD). What would I be giving up if I went with the (lower cost) Reds?

 

[HEXiT]

nothing. reds are designed for enthusiast class raid systems. so is the correct drive for you.
blue is for single drive setups
green is low power low usage.
black is the high end business class. very little difference from reds other than there designed for constant use in servers and the likes to run 24/7 365.