QNAP Launched the x53B series. It comprises of
Desktop Models : TS-253B, TS-453B, TS-653B
Rackmount Models : TS-453BURP, TS-653BURP, TS-853BURP
Main Difference in B series is that it has a PCI expansion slot that can be used to update the NAS. While the Desktop A series ( 453A) will still continue, QNAP has announced that old Rackmount series would be discontinued
