Product comparison · 2 pcs/workstations

Lenovo ThinkCentre M51 Intel® Pentium® 4 vs Lenovo ThinkCentre M55 Intel® Pentium® D 915

31specifications compared
15differ
16identical
62known for one product only

Key differences

The Lenovo ThinkCentre M51 Intel® Pentium® 4 has 0.4 GHz more processor frequency than the Lenovo ThinkCentre M55 Intel® Pentium® D 915 (3.2 GHz vs 2.8 GHz). The Lenovo ThinkCentre M55 Intel® Pentium® D 915 has 0.5 GB more internal memory than the Lenovo ThinkCentre M51 Intel® Pentium® 4 (1 GB vs 0.5 GB). The Lenovo ThinkCentre M55 Intel® Pentium® D 915 has 120 GB more total storage capacity than the Lenovo ThinkCentre M51 Intel® Pentium® 4 (160 GB vs 40 GB). Processor family: Intel® Pentium® 4 on the Lenovo ThinkCentre M51 Intel® Pentium® 4, Intel® Pentium® D on the Lenovo ThinkCentre M55 Intel® Pentium® D 915. Internal memory type: DDR-SDRAM on the Lenovo ThinkCentre M51 Intel® Pentium® 4, DDR2-SDRAM on the Lenovo ThinkCentre M55 Intel® Pentium® D 915.

Processor family
- ThinkCentre M51 Intel® Pentium® 4:Intel® Pentium® 4
- ThinkCentre M55 Intel® Pentium® D 915:Intel® Pentium® D
Processor frequency
- ThinkCentre M51 Intel® Pentium® 4:3.2 GHz
- ThinkCentre M55 Intel® Pentium® D 915:2.8 GHz
Internal memory
- ThinkCentre M51 Intel® Pentium® 4:0.5 GB
- ThinkCentre M55 Intel® Pentium® D 915:1 GB
Internal memory type
- ThinkCentre M51 Intel® Pentium® 4:DDR-SDRAM
- ThinkCentre M55 Intel® Pentium® D 915:DDR2-SDRAM
Total storage capacity
- ThinkCentre M51 Intel® Pentium® 4:40 GB
- ThinkCentre M55 Intel® Pentium® D 915:160 GB
Optical drive type
- ThinkCentre M51 Intel® Pentium® 4:CD-ROM
- ThinkCentre M55 Intel® Pentium® D 915:DVD-ROM
Discrete graphics card model
- ThinkCentre M51 Intel® Pentium® 4:Intel® GMA 900
- ThinkCentre M55 Intel® Pentium® D 915:Intel® GMA 3000
CD read speed
- ThinkCentre M51 Intel® Pentium® 4:48x
- ThinkCentre M55 Intel® Pentium® D 915:24x

Side by side

Differences highlightedShow differences only

Comparison of M51, M55
93 specifications	A Lenovo ThinkCentre M51 Intel® Pentium® 4 Model M51 View product	B Lenovo ThinkCentre M55 Intel® Pentium® D 915 Model M55 View product
Processor2 differ
Processor manufacturer	Intel	Intel
Processor familyDiffers	Intel® Pentium® 4	Intel® Pentium® D
Processor modelKnown for one	Unknown — not stated by the source	915
Processor coresKnown for one	Unknown — not stated by the source	2
Processor threadsKnown for one	Unknown — not stated by the source	2
Processor frequencyDiffers	3.2 GHz	2.8 GHz
Processor cacheKnown for one	Unknown — not stated by the source	4 MB
Processor cache typeKnown for one	Unknown — not stated by the source	L2
Processor front side bus	800 MHz	800 MHz
Bus typeKnown for one	Unknown — not stated by the source	FSB
FSB ParityKnown for one	Unknown — not stated by the source	No
Processor lithographyKnown for one	Unknown — not stated by the source	65 nm
Processor operating modesKnown for one	Unknown — not stated by the source	64-bit
Processor seriesKnown for one	Unknown — not stated by the source	Intel Pentium D 900 Series
Processor codenameKnown for one	Unknown — not stated by the source	Presler
Thermal Design Power (TDP)Known for one	Unknown — not stated by the source	95 W
TcaseKnown for one	Unknown — not stated by the source	63.4 °C
Processor socketKnown for one	Unknown — not stated by the source	LGA 775 (Socket T)
Number of Processing Die TransistorsKnown for one	Unknown — not stated by the source	376 M
Processing Die sizeKnown for one	Unknown — not stated by the source	162 mm²
CPU multiplier (bus/core ratio)Known for one	Unknown — not stated by the source	14
ECC supported by processorKnown for one	Unknown — not stated by the source	No
Memory2 differ
Internal memoryDiffers	0.5 GB	1 GB
Internal memory typeDiffers	DDR-SDRAM	DDR2-SDRAM
Memory slotsKnown for one	Unknown — not stated by the source	2x DIMM
Maximum internal memoryKnown for one	4 GB	Unknown — not stated by the source
Storage2 differ
Total storage capacityDiffers	40 GB	160 GB
Optical drive typeDiffers	CD-ROM	DVD-ROM
HDD interface	SATA	SATA
HDD speed	7200 RPM	7200 RPM
Diskette drive memoryKnown for one	1.44 MB	Unknown — not stated by the source
Graphics1 differ
Discrete graphics card modelDiffers	Intel® GMA 900	Intel® GMA 3000
Performanceidentical
Product type	PC	PC
Motherboard chipsetKnown for one	Unknown — not stated by the source	Intel® Q963 Express
Optical drive1 differ
CD read speedDiffers	48x	24x
CD write speedKnown for one	Unknown — not stated by the source	24x
CD rewrite speedKnown for one	Unknown — not stated by the source	24x
DVD read speedKnown for one	Unknown — not stated by the source	8x
Networkidentical
Networking features	Ethernet/Fast Ethernet/Gigabit Ethernet	Ethernet/Fast Ethernet/Gigabit Ethernet
Ports & interfacesidentical
USB 2.0 ports quantity	8	8
Ethernet LAN (RJ-45) ports	1	1
Headphone outputs	1	1
Line-out	Yes	Yes
Line-inKnown for one	Unknown — not stated by the source	Yes
Microphone in	Yes	Yes
VGA (D-Sub) ports quantity	1	1
Parallel ports quantity	1	1
PS/2 ports quantityKnown for one	2	Unknown — not stated by the source
Power1 differ
Power supplyDiffers	310 W	225 W
Software1 differ
Operating system installed	Windows XP Professional	Windows XP Professional
Bundled softwareDiffers	Lotus Notes Stand-alone Client (license), Lotus SmartSuite Millennium (license), Norton AntiVirus 2004, PC Doctor diagnostics, Access Program, ThinkVantage Client Security Solution, ThinkVantage Rescue and Recovery with Rapid Restore, IBM Director Agent (web deliverable)	Adobe Acrobat Reader, Diskeeper 9.0 Home Edition, Google Desktop, Google Toolbar, Microsoft Office Hybrid Pro image 2007, Picasa, ThinkVantage Client Security Solution, ThinkVantage Productivity Center, ThinkVantage Rescue & Recovery, ThinkVantage System Update, Sun JRE, Norton Internet Security (OE
Displayidentical
Display included	No	No
Processor special featuresidentical
Embedded options availableKnown for one	Unknown — not stated by the source	No
Enhanced Intel SpeedStep TechnologyKnown for one	Unknown — not stated by the source	Yes
Execute Disable BitKnown for one	Unknown — not stated by the source	Yes
Idle StatesKnown for one	Unknown — not stated by the source	Yes
Intel 64Known for one	Unknown — not stated by the source	Yes
Intel Clear Video TechnologyKnown for one	Unknown — not stated by the source	No
Intel Demand Based SwitchingKnown for one	Unknown — not stated by the source	No
Intel Dual Display Capable TechnologyKnown for one	Unknown — not stated by the source	No
Intel Enhanced Halt StateKnown for one	Unknown — not stated by the source	Yes
Intel FDI TechnologyKnown for one	Unknown — not stated by the source	No
Intel Fast Memory AccessKnown for one	Unknown — not stated by the source	No
Intel Flex Memory AccessKnown for one	Unknown — not stated by the source	No
Intel Rapid Storage TechnologyKnown for one	Unknown — not stated by the source	No
Intel Trusted Execution TechnologyKnown for one	Unknown — not stated by the source	No
Intel VT-x with Extended Page Tables (EPT)Known for one	Unknown — not stated by the source	No
Intel Virtualization Technology (VT-x)Known for one	Unknown — not stated by the source	No
Intel Virtualization Technology for Directed I/O (VT-d)Known for one	Unknown — not stated by the source	No
Intel® AES New Instructions (Intel® AES-NI)Known for one	Unknown — not stated by the source	No
Intel® Clear Video HD Technology (Intel® CVT HD)Known for one	Unknown — not stated by the source	No
Intel® Clear Video Technology for Mobile Internet Devices (Intel CVT for MID)Known for one	Unknown — not stated by the source	No
Intel® InTru™ 3D TechnologyKnown for one	Unknown — not stated by the source	No
Intel® Insider™Known for one	Unknown — not stated by the source	No
Intel® Wireless Display (Intel® WiDi)Known for one	Unknown — not stated by the source	No
Physical Address Extension (PAE)Known for one	Unknown — not stated by the source	32 bit
Processor ARK IDKnown for one	Unknown — not stated by the source	27515
Processor package sizeKnown for one	Unknown — not stated by the source	37.5 x 37.5 mm
Thermal Monitoring TechnologiesKnown for one	Unknown — not stated by the source	No
Intel® Turbo Boost TechnologyKnown for one	Unknown — not stated by the source	No
Intel® Hyper Threading Technology (Intel® HT Technology)Known for one	Unknown — not stated by the source	No
Intel® Quick Sync Video TechnologyKnown for one	Unknown — not stated by the source	No
Intel® My WiFi Technology (Intel® MWT)Known for one	Unknown — not stated by the source	No
Intel® Anti-Theft Technology (Intel® AT)Known for one	Unknown — not stated by the source	No
Conflict-Free processorKnown for one	Unknown — not stated by the source	No
Audio1 differ
Audio systemDiffers	SoundMAX Cadenza	ADI 1983 HD
Weight & dimensions4 differ
WidthDiffers	175 mm	276 mm
DepthDiffers	450 mm	270 mm
HeightDiffers	492 mm	89 mm
WeightDiffers	13.5 kg	6.4 kg
Other featuresidentical
Intel segment tagging	Enterprise, Professional	Enterprise, Professional
Security featuresKnown for one	-Boot without keyboard or mouse -Configuration password -Diskette Boot inhibit -Diskette I/O control -Hard disk drive password -Hard drive I/O control -Padlock loop -Parallel port I/O control -Power on password -Security slot (for attachment of optional cable lock) -Serial port I/O control	Unknown — not stated by the source
Designidentical
Chassis typeKnown for one	Tower	Unknown — not stated by the source

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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