We have taken a look at a decent number of network attached storage servers over the last year or so, and I am always interested in having a look at the different approaches that can be taken from model to model and brand to brand.  In this review we have a fairly unique device in the form of the 
Thecus W4000+.  This is a Windows Storage Server 2012 R2 Essentials based device that runs on a dual core Intel Atom with 4GB of DDR3 memory.  While it offers four 3.5" bays for storage drives, the operating system is housed on a separate 60GB Kingston brand SSD.  
 
 
 
 
 
As shown in the promotional image above, the W4000+ looks like what I have come to recognize as a Thecus device, with the prominent features including an LCD screen and locked/vented bay doors for the four hard drives.  Before taking a closer look at the unit provided for review, let's take a quick look at some of the features and specifications taken from the 
official product page on the Thecus website...
Features:
» Top Storage for 1-50 Employee Business
» Office 365 & Microsoft Azure: Cloud Service Integration
» Active Directory Domain Services: Scalable, Secure User Management
» Data Deduplication: Performance Optimization
» Enhanced Boot Drive: Embedded 60GB SSD
» Windows License Included
» Available with 2 GB of DDR3 RAM (W4000) or 4 GB of DDR3 RAM (W4000+) 
Specifications:
» Processor: Intel® Atom™ D2701 (2.13GHz Dual Core) 
» System Memory:  2GB DDR3(W4000)/4GB DDR3(W4000+)  
» Memory expandable up to:  4GB Memory Compatibility List 
» Embedded Boot Drive: 60GB SSD 
» Drive Bays: 4 
» Form Factors Supported: 2.5" / 3.5" 
» LAN Interface: 
   » RJ-45x2: 10/100/1000 BASE-TX Auto MDI/MDI-X
   » WOL supported 
» USB Interface:
   » USB 2.0 host port x2 (back x2) 
   » USB 3.0 host port x2 (front x2)  
» HDMI Output: HDMI port (back x1)  
» VGA Output: VGA port (back x1) 
» Audio: Line output 
» Disk Interface: 
   » 4 x SATA for internal
   » 1 x eSATA for external 
» Power Supply: External power adapter 
» PCI-e x1 Slot: 1 (1 lane) 
» System Clock: Battery-backed up system clock 
» Power Management: Auto power on after shutdown due to power loss 
» Buzzer: Adjustable frequency alarm  
» Buttons: Power button  
» Environment:
   » Temperature: 5°C to 40°C
   » Humidity: 0 ~ 80 % R.H. (Non-condensing) 
» Chassis Tower: Metal Chassis  
» Dimensions (HxWxD): 192 x 172 x 250 (mm)/ 7.56 x6.77 x 9.84 (in) 
» Weight (Kgs): 6.6 
The information above details that there are two models available...  the W4000 with 2GB of memory and the W4000+ with 4GB of memory.  2GB of memory is typically sufficient for a Unix based NAS, but since this is a Windows based device, that extra memory might be a very welcomed upgrade.  While we'll be checking out the W4000+, it may be of interest to note that the W4000 typically sells for about $50 less, and the memory is user upgradable.