Product comparison · 2 nas & storage servers

QNAP TS-251-4G NAS/storage server Tower Intel® Celeron® vs QNAP TS-851-4G NAS/storage server Tower Intel® Celeron®

39specifications compared
12differ
27identical
5known for one product only

Key differences

Number of storage drives supported
- TS-251-4G NAS/storage server Tower Intel® Celeron®:2
- TS-851-4G NAS/storage server Tower Intel® Celeron®:8
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
- TS-251-4G NAS/storage server Tower Intel® Celeron®:2
- TS-851-4G NAS/storage server Tower Intel® Celeron®:3
Product colour
- TS-251-4G NAS/storage server Tower Intel® Celeron®:Grey, White
- TS-851-4G NAS/storage server Tower Intel® Celeron®:Black
Number of fans
- TS-251-4G NAS/storage server Tower Intel® Celeron®:1 fan(s)
- TS-851-4G NAS/storage server Tower Intel® Celeron®:2 fan(s)
Power supply location
- TS-251-4G NAS/storage server Tower Intel® Celeron®:External
- TS-851-4G NAS/storage server Tower Intel® Celeron®:Built-in
Power consumption (typical)
- TS-251-4G NAS/storage server Tower Intel® Celeron®:19.22 W
- TS-851-4G NAS/storage server Tower Intel® Celeron®:56.79 W
Power consumption (sleep)
- TS-251-4G NAS/storage server Tower Intel® Celeron®:0.47 W
- TS-851-4G NAS/storage server Tower Intel® Celeron®:0.72 W
Width
- TS-251-4G NAS/storage server Tower Intel® Celeron®:102 mm
- TS-851-4G NAS/storage server Tower Intel® Celeron®:298.2 mm

Side by side

Differences highlightedShow differences only

Comparison of TS-251-4G, TS-851-4G
44 specifications	A QNAP TS-251-4G NAS/storage server Tower Intel® Celeron® Model TS-251-4G View product	B QNAP TS-851-4G NAS/storage server Tower Intel® Celeron® Model TS-851-4G View product
Storage1 differ
Storage drives installed	No	No
Number of storage drives installed	0	0
Number of storage drives supportedDiffers	2	8
Supported storage drive types	HDD & SSD	HDD & SSD
Storage drive interface	Serial ATA II, Serial ATA III	Serial ATA II, Serial ATA III
Storage drive size	2.5/3.5"	2.5/3.5"
RAID support	Yes	Yes
Hot-swap drive bays	Yes	Yes
Processoridentical
Processor family	Intel® Celeron®	Intel® Celeron®
Processor frequency	2.41 GHz	2.41 GHz
Processor cores	2	2
Memoryidentical
Internal memory	4 GB	4 GB
Internal memory type	DDR3L	DDR3L
Maximum RAM supportedKnown for one	Unknown — not stated by the source	8 GB
Networkidentical
Ethernet LAN	Yes	Yes
Ethernet LAN data rates	10,100,1000 Mbit/s	10,100,1000 Mbit/s
Wi-Fi	No	No
Ports & interfaces1 differ
Ethernet LAN (RJ-45) ports	2	2
USB 2.0 ports quantity	2	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers	2	3
HDMI ports quantity	1	1
Design2 differ
Chassis type	Tower	Tower
Cooling type	Active	Active
Product colourDiffers	Grey, White	Black
Number of fansDiffers	1 fan(s)	2 fan(s)
LED indicatorsKnown for one	Yes	Unknown — not stated by the source
Performanceidentical
Type	NAS	NAS
Device class	Home & Home Office	Home & Home Office
Softwareidentical
Operating system installed	QNAP Turbo System	QNAP Turbo System
Operating system version	4.1	4.1
Power3 differ
Power supply locationDiffers	External	Built-in
Power supply unit (PSU) capacityKnown for one	60 W	Unknown — not stated by the source
Number of power supply unitsKnown for one	1	Unknown — not stated by the source
Power consumption (typical)Differs	19.22 W	56.79 W
Power consumption (sleep)Differs	0.47 W	0.72 W
AC input voltage	100-240 V	100-240 V
AC input frequencyKnown for one	Unknown — not stated by the source	50 - 60 Hz
Weight & dimensions5 differ
WidthDiffers	102 mm	298.2 mm
DepthDiffers	225 mm	235.4 mm
HeightDiffers	168.5 mm	185.2 mm
WeightDiffers	1.28 kg	7.83 kg
Package weightDiffers	2.32 kg	8.9 kg
Operational conditionsidentical
Operating temperature (T-T)	0 - 40 °C	0 - 40 °C
Operating relative humidity (H-H)	5 - 95%	5 - 95%

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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