19
System
TS-651 /
TS-651-4G
TS-851 /
TS-851-4G
CPU
Dual-core Intel
®
Celeron™ 2.41GHz
(up to 2.58GHz)
Dual-core Intel
®
Celeron™ 2.41GHz
(up to 2.58GHz)
Memory
1GB / 4GB DDR3L
(Expandable RAM, up
to 8GB)
1GB / 4GB DDR3L
(Expandable RAM, up
to 8GB)
Flash
512MB
512MB
Memory
replaceable
✔
(Compatible with
DDR3L RAM)
✔
(Compatible with
DDR3L RAM)
Number of RAM
slots
2 (SODIMM)
2 (SODIMM)
Number of hard
drive slots
6
8
IR sensor
✔
(QNAP remote
control: RM-IR002)
✔
(QNAP remote
control: RM-IR002)
System
HS-251+
HS-251 /
HS-251-2G
CPU
Quad-core Intel
®
Celeron™ 2.0GHz (up
to 2.42GHz)
Dual-core Intel
®
Celeron™ 2.41GHz
(up to 2.58GHz)
Memory
2GB DDR3L
1GB / 2GB DDR3L
Flash
512MB
512MB
CPU replaceable
-
-
Memory
replaceable
-
-
Number of RAM
slots
-
-
Number of hard
drive slots
2
2
IR sensor
✔
(QNAP remote
control: RM-IR002)
✔
(QNAP remote
control: RM-IR002)