Product comparison · 2 pcs/workstations

Lenovo ThinkCentre A55 Intel® Pentium® D 915 vs Lenovo ThinkCentre M51 Intel® Pentium® 4

31specifications compared
14differ
17identical
59known for one product only

Key differences

The Lenovo ThinkCentre M51 Intel® Pentium® 4 has 0.4 GHz more processor frequency than the Lenovo ThinkCentre A55 Intel® Pentium® D 915 (3.2 GHz vs 2.8 GHz). The Lenovo ThinkCentre A55 Intel® Pentium® D 915 has 40 GB more total storage capacity than the Lenovo ThinkCentre M51 Intel® Pentium® 4 (80 GB vs 40 GB). The Lenovo ThinkCentre M51 Intel® Pentium® 4 has 85 W more power supply than the Lenovo ThinkCentre A55 Intel® Pentium® D 915 (310 W vs 225 W). Processor family: Intel® Pentium® D on the Lenovo ThinkCentre A55 Intel® Pentium® D 915, Intel® Pentium® 4 on the Lenovo ThinkCentre M51 Intel® Pentium® 4. Internal memory type: DDR2-SDRAM on the Lenovo ThinkCentre A55 Intel® Pentium® D 915, DDR-SDRAM on the Lenovo ThinkCentre M51 Intel® Pentium® 4.

Processor family
- ThinkCentre A55 Intel® Pentium® D 915:Intel® Pentium® D
- ThinkCentre M51 Intel® Pentium® 4:Intel® Pentium® 4
Processor frequency
- ThinkCentre A55 Intel® Pentium® D 915:2.8 GHz
- ThinkCentre M51 Intel® Pentium® 4:3.2 GHz
Internal memory type
- ThinkCentre A55 Intel® Pentium® D 915:DDR2-SDRAM
- ThinkCentre M51 Intel® Pentium® 4:DDR-SDRAM
Total storage capacity
- ThinkCentre A55 Intel® Pentium® D 915:80 GB
- ThinkCentre M51 Intel® Pentium® 4:40 GB
Optical drive type
- ThinkCentre A55 Intel® Pentium® D 915:DVD-ROM
- ThinkCentre M51 Intel® Pentium® 4:CD-ROM
Discrete graphics card model
- ThinkCentre A55 Intel® Pentium® D 915:Intel® GMA 3000
- ThinkCentre M51 Intel® Pentium® 4:Intel® GMA 900
Power supply
- ThinkCentre A55 Intel® Pentium® D 915:225 W
- ThinkCentre M51 Intel® Pentium® 4:310 W
Chassis type
- ThinkCentre A55 Intel® Pentium® D 915:SFF
- ThinkCentre M51 Intel® Pentium® 4:Tower

Side by side

Differences highlightedShow differences only

Comparison of A55, M51
90 specifications	A Lenovo ThinkCentre A55 Intel® Pentium® D 915 Model A55 View product	B Lenovo ThinkCentre M51 Intel® Pentium® 4 Model M51 View product
Processor2 differ
Processor familyDiffers	Intel® Pentium® D	Intel® Pentium® 4
Processor modelKnown for one	915	Unknown — not stated by the source
Processor coresKnown for one	2	Unknown — not stated by the source
Processor threadsKnown for one	2	Unknown — not stated by the source
Processor frequencyDiffers	2.8 GHz	3.2 GHz
Processor cacheKnown for one	4 MB	Unknown — not stated by the source
Processor cache typeKnown for one	L2	Unknown — not stated by the source
Bus typeKnown for one	FSB	Unknown — not stated by the source
FSB ParityKnown for one	No	Unknown — not stated by the source
Processor lithographyKnown for one	65 nm	Unknown — not stated by the source
Processor operating modesKnown for one	64-bit	Unknown — not stated by the source
Processor seriesKnown for one	Intel Pentium D 900 Series	Unknown — not stated by the source
Processor codenameKnown for one	Presler	Unknown — not stated by the source
Thermal Design Power (TDP)Known for one	95 W	Unknown — not stated by the source
TcaseKnown for one	63.4 °C	Unknown — not stated by the source
Processor socketKnown for one	LGA 775 (Socket T)	Unknown — not stated by the source
Number of Processing Die TransistorsKnown for one	376 M	Unknown — not stated by the source
Processing Die sizeKnown for one	162 mm²	Unknown — not stated by the source
CPU multiplier (bus/core ratio)Known for one	14	Unknown — not stated by the source
ECC supported by processorKnown for one	No	Unknown — not stated by the source
Memory1 differ
Internal memory typeDiffers	DDR2-SDRAM	DDR-SDRAM
Memory slotsKnown for one	2x DIMM	Unknown — not stated by the source
Storage2 differ
Total storage capacityDiffers	80 GB	40 GB
Optical drive typeDiffers	DVD-ROM	CD-ROM
Diskette drive memoryKnown for one	Unknown — not stated by the source	1.44 MB
Graphics1 differ
Discrete graphics card modelDiffers	Intel® GMA 3000	Intel® GMA 900
Ports & interfacesidentical
DVI portKnown for one	Yes	Unknown — not stated by the source
Serial ports quantityKnown for one	1	Unknown — not stated by the source
Line-outKnown for one	Unknown — not stated by the source	Yes
Power1 differ
Power supplyDiffers	225 W	310 W
Design1 differ
Chassis typeDiffers	SFF	Tower
Software1 differ
Bundled softwareDiffers	Adobe Acrobat Reader, Diskeeper Lite from Diskeeper, Google Desktop, Google Toolbar, Lotus Notes Stand-alone Client (license), Lotus SmartSuite Millennium edition (license), Picasa, Symantec Client Security (OEM), ThinkVantage Client Security Software, ThinkVantage Productivity Center, ThinkVantage	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)
Processor special featuresidentical
Embedded options availableKnown for one	No	Unknown — not stated by the source
Enhanced Intel SpeedStep TechnologyKnown for one	Yes	Unknown — not stated by the source
Execute Disable BitKnown for one	Yes	Unknown — not stated by the source
Idle StatesKnown for one	Yes	Unknown — not stated by the source
Intel 64Known for one	Yes	Unknown — not stated by the source
Intel Clear Video TechnologyKnown for one	No	Unknown — not stated by the source
Intel Demand Based SwitchingKnown for one	No	Unknown — not stated by the source
Intel Dual Display Capable TechnologyKnown for one	No	Unknown — not stated by the source
Intel Enhanced Halt StateKnown for one	Yes	Unknown — not stated by the source
Intel FDI TechnologyKnown for one	No	Unknown — not stated by the source
Intel Fast Memory AccessKnown for one	No	Unknown — not stated by the source
Intel Flex Memory AccessKnown for one	No	Unknown — not stated by the source
Intel Rapid Storage TechnologyKnown for one	No	Unknown — not stated by the source
Intel Trusted Execution TechnologyKnown for one	No	Unknown — not stated by the source
Intel VT-x with Extended Page Tables (EPT)Known for one	No	Unknown — not stated by the source
Intel Virtualization Technology (VT-x)Known for one	No	Unknown — not stated by the source
Intel Virtualization Technology for Directed I/O (VT-d)Known for one	No	Unknown — not stated by the source
Intel® AES New Instructions (Intel® AES-NI)Known for one	No	Unknown — not stated by the source
Intel® Clear Video HD Technology (Intel® CVT HD)Known for one	No	Unknown — not stated by the source
Intel® Clear Video Technology for Mobile Internet Devices (Intel CVT for MID)Known for one	No	Unknown — not stated by the source
Intel® InTru™ 3D TechnologyKnown for one	No	Unknown — not stated by the source
Intel® Insider™Known for one	No	Unknown — not stated by the source
Intel® Wireless Display (Intel® WiDi)Known for one	No	Unknown — not stated by the source
Physical Address Extension (PAE)Known for one	32 bit	Unknown — not stated by the source
Processor ARK IDKnown for one	27515	Unknown — not stated by the source
Processor package sizeKnown for one	37.5 x 37.5 mm	Unknown — not stated by the source
Thermal Monitoring TechnologiesKnown for one	No	Unknown — not stated by the source
Intel® Turbo Boost TechnologyKnown for one	No	Unknown — not stated by the source
Intel® Hyper Threading Technology (Intel® HT Technology)Known for one	No	Unknown — not stated by the source
Intel® Quick Sync Video TechnologyKnown for one	No	Unknown — not stated by the source
Intel® My WiFi Technology (Intel® MWT)Known for one	No	Unknown — not stated by the source
Intel® Anti-Theft Technology (Intel® AT)Known for one	No	Unknown — not stated by the source
Conflict-Free processorKnown for one	No	Unknown — not stated by the source
Audio1 differ
Audio systemDiffers	ADI 1986 A	SoundMAX Cadenza
Weight & dimensions4 differ
WidthDiffers	310 mm	175 mm
DepthDiffers	358 mm	450 mm
HeightDiffers	85 mm	492 mm
WeightDiffers	8.5 kg	13.5 kg
Optical driveidentical
CD read speedKnown for one	Unknown — not stated by the source	48x
Other featuresidentical
Security featuresKnown for one	Unknown — not stated by the source	-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
Intel segment taggingKnown for one	Unknown — not stated by the source	Enterprise, Professional

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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