Plus Series 4-bay NAS for Offices and IT Pros Diskless 0 TB Supports RAID SHR, 0,1,5,6,10 DiskStation DS420+ Simplify the file management experience Super high-performance NAS with SSD cache acceleration Synology DS420 + is specially designed for IT enthusiasts and home users. It is equipped with dual-core processor and built-in M.2 NVMe 2280 SSD slot to speed up the cache. It is ideal for file sharing, video streaming, and photo indexing. Processor Dual core 2.0 GHz, the highest clock can reach 2.9 GHz Cache acceleration Built-in dual M.2 2280 NVMe SSD slot Network 2 x 1GbE LAN port Efficacy 15% increase in intensive computing applications Improve performance with built-in SSD slot DS420 + has a built-in dual M.2 SSD slot, allowing you to make good use of Synology SSD cache. Creating a cache can speed up I / O response time by 20 times without occupying the front hard drive bay.