TechPowerUp posted a review on the Synology DS715 2-bay NAS
A quote from the article:
The Synology DS715 is a quad-core CPU NAS with two Ethernet ports. Having two drive bays it is ideal to meet the demands of enthusiast home users and small business environments, but can also expanded to support a total of seven drives.Synology DS715 2-bay NAS @ techPowerUp