In the current NAS market, it is downright impossible to talk of ARM and high performance together. The most powerful ARM-based NAS units have been based on Marvell's ARMADA processors. They usually come with dual gigabit network links and typically target the SOHO and low-end SMB market. Intel's offerings have had a virtual monopoly in the other tiers of the market. Synology is set to change all that with their latest offering - the DS2015xs with native 10G capabilities.
DS2015xs: Features & Specifications
The DS2015xs is 8-bay NAS unit presented as a step-up from the DS1815+. While the DS1815+ can expand up to a total of 18 bays with two DX513 expansion chassis, the DS2015xs is compatible with the 12-bay DX1215 expander (for a total of 20 bays). The main step-up from the DS1815+ is the presence of two built-in 10G SFP+ copper links.
http://www.anandtech.com/show/8777/s...ance-nas-units