User manual
  17 
System 
HS-251 / HS-251-2G 
CPU 
Dual-core Intel
®
Celeron™ 2.41 GHz (up 
to 2.58GHz) 
Memory 
1GB / 2GB DDR3L 
Flash 
512MB 
CPU replaceable 
No 
Memory replaceable 
No 
Number of SODIMM 
slots 
0 
Number of hard drive 
slots 
2 
IR sensor 
Yes (QNAP remote 
control: RM-IR002) 
System 
TS-253 Pro /   
TS-253 Pro-8G 
TS-453mini-2G /   
TS-453mini-8G 
TS-453 Pro /   
TS-453 Pro-8G 
CPU 
Quad-core Intel
®
Celeron™ 2.0 GHz (up 
to 2.41GHz) 
Quad-core Intel
®
Celeron™ 2.0 GHz (up 
to 2.41GHz) 
Quad-core Intel
®
Celeron™ 2.0 GHz (up 
to 2.41GHz) 
Memory 
2GB / 8GB DDR3L 
(Expandable RAM, up to 
8GB) 
2GB / 8GB DDR3L 
(Expandable RAM, up to 
8GB) 
2GB / 8GB DDR3L 
(Expandable RAM, up to 
8GB) 
Flash 
512MB 
512MB 
512MB 
Memory replaceable 
Yes (DDR3L-1333 
SODIMM DRAM) 
Yes (DDR3L-1333 
SODIMM DRAM) 
Yes (DDR3L-1333 
SODIMM DRAM) 
Number of SODIMM 
slots 
2 
2 
2 
Number of hard drive 
slots 
2 
4 
4 
LCD panel 
No 
No 
Yes 
IR sensor 
Yes (QNAP remote 
control: RM-IR002) 
Yes (QNAP remote 
control: RM-IR002) 
Yes (QNAP remote 
control: RM-IR002) 










