QNAP TS-879U-RP - TS-651; TS-651-4 G Specifications; TS-851; TS-851-4 G Specifications; HS-251+ Specifications; HS-251 and HS-251-2 G Specifications

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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)