Product comparison · 2 pcs/workstations

Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz vs Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz

78specifications compared
17differ
61identical
32known for one product only

Key differences

The Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz has 10 more processor model than the Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz (640 vs 630). The Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz has 0.2 GHz more processor frequency than the Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz (3.2 GHz vs 3 GHz). The Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz has 1 more CPU multiplier (bus/core ratio) than the Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz (16 vs 15). Only the Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz has thermal Monitoring Technologies. Internal memory type: DDR2-SDRAM on the Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz, DDR-SDRAM on the Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz.

Processor model
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:630
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:640
Processor frequency
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:3 GHz
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:3.2 GHz
CPU multiplier (bus/core ratio)
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:15
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:16
Internal memory
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:0.25 GB
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:0.5 GB
Maximum internal memory
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:4 GB
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:2 GB
Internal memory type
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:DDR2-SDRAM
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:DDR-SDRAM
USB 2.0 ports quantity
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:6
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:8
Power supply
- ThinkCentre A51 Pentium 4 630 HT 3.0GHz:310 W
- ThinkCentre A51 Pentium 4 640 HT 3.2GHz:225 W

Side by side

Differences highlightedShow differences only

Comparison of ThinkCentre A51 Pentium 4 630 HT 3.0GHz, ThinkCentre A51 Pentium 4 640 HT 3.2GHz
110 specifications	A Lenovo ThinkCentre A51 Pentium 4 630 HT 3.0GHz View product	B Lenovo ThinkCentre A51 Pentium 4 640 HT 3.2GHz View product
Processor3 differ
Processor manufacturer	Intel	Intel
Processor family	Intel® Pentium® 4	Intel® Pentium® 4
Processor modelDiffers	630	640
Processor cores	1	1
Processor threads	2	2
Processor frequencyDiffers	3 GHz	3.2 GHz
Processor cache	2 MB	2 MB
Processor cache type	L2	L2
Processor front side bus	800 MHz	800 MHz
Bus type	FSB	FSB
FSB Parity	No	No
Processor lithography	90 nm	90 nm
Processor operating modes	64-bit	64-bit
Processor codename	Prescott	Prescott
Thermal Design Power (TDP)	84 W	84 W
Tcase	66.6 °C	66.6 °C
PCI Express slots versionKnown for one	Unknown — not stated by the source	2.0
Processor socket	LGA 775 (Socket T)	LGA 775 (Socket T)
Number of Processing Die Transistors	169 M	169 M
Processing Die size	135 mm²	135 mm²
CPU multiplier (bus/core ratio)Differs	15	16
Processor core voltage (AC)Known for one	Unknown — not stated by the source	1.25 - 1.388 V
Maximum internal memory supported by processorKnown for one	Unknown — not stated by the source	32 GB
Memory types supported by processorKnown for one	Unknown — not stated by the source	DDR3-SDRAM
Memory clock speeds supported by processorKnown for one	Unknown — not stated by the source	1066 MHz
Memory bandwidth supported by processor (max)Known for one	Unknown — not stated by the source	17 GB/s
ECC supported by processor	No	No
Processor seriesKnown for one	Intel Pentium 4 600 Series supporting Hyper-Threading Technology	Unknown — not stated by the source
Memory3 differ
Internal memoryDiffers	0.25 GB	0.5 GB
Maximum internal memoryDiffers	4 GB	2 GB
Internal memory typeDiffers	DDR2-SDRAM	DDR-SDRAM
Memory channelsKnown for one	Unknown — not stated by the source	Dual-channel
Storageidentical
Total storage capacity	80 GB	80 GB
Optical drive type	DVD-ROM	DVD-ROM
HDD interfaceKnown for one	Unknown — not stated by the source	SATA
HDD speed	7200 RPM	7200 RPM
Diskette drive memory	1.44 MB	1.44 MB
Storage drive typeKnown for one	SATA	Unknown — not stated by the source
Graphicsidentical
On-board graphics cardKnown for one	Unknown — not stated by the source	Yes
Discrete graphics card model	Intel® GMA 900	Intel® GMA 900
On-board graphics card familyKnown for one	Unknown — not stated by the source	Intel® HD Graphics
On-board graphics card modelKnown for one	Unknown — not stated by the source	Intel® HD Graphics
Number of displays supported (on-board graphics)Known for one	Unknown — not stated by the source	2
On-board graphics card base frequencyKnown for one	Unknown — not stated by the source	850 MHz
On-board graphics card dynamic frequency (max)Known for one	Unknown — not stated by the source	1100 MHz
Video adapter resolution	2048x1536 16777216 colors	2048x1536 16777216 colors
Video adapter, bus	PCI Express	PCI Express
Performanceidentical
Product type	PC	PC
Optical driveidentical
CD read speedKnown for one	Unknown — not stated by the source	48x
CD write speedKnown for one	Unknown — not stated by the source	48x
CD rewrite speedKnown for one	Unknown — not stated by the source	32x
DVD read speed	16x	16x
Network1 differ
Networking featuresDiffers	Ethernet/Fast Ethernet	Ethernet/Fast Ethernet/Gigabit Ethernet
Ports & interfaces1 differ
USB 2.0 ports quantityDiffers	6	8
Ethernet LAN (RJ-45) ports	1	1
Headphone outputs	1	1
Microphone in	Yes	Yes
VGA (D-Sub) ports quantity	1	1
PS/2 ports quantity	2	2
Parallel ports quantity	1	1
Firewire (IEEE 1394) portsKnown for one	0	Unknown — not stated by the source
TV-outKnown for one	No	Unknown — not stated by the source
Serial ports quantityKnown for one	1	Unknown — not stated by the source
Modem (RJ-11) portsKnown for one	0	Unknown — not stated by the source
USB 1.1 ports quantityKnown for one	0	Unknown — not stated by the source
Power1 differ
Power supplyDiffers	310 W	225 W
Design1 differ
Chassis typeDiffers	Desktop	SFF
Softwareidentical
Operating system installed	Windows XP Professional	Windows XP Professional
Bundled softwareKnown for one	Unknown — not stated by the source	Lotus Notes Stand-alone Client (license), Lotus SmartSuite Millennium (license), Access program, IBM Director Agent (web deliverable), ThinkVantage Client Security Software (web-downloadable), ThinkVantage Rescue and Recovery with Rapid Restore, Norton AntiVirus 2004 OEM Version, PC Doctor diagnosti
Displayidentical
Display included	No	No
Processor special features2 differ
CPU configuration (max)Known for one	Unknown — not stated by the source	1
Embedded options available	No	No
Enhanced Intel SpeedStep Technology	Yes	Yes
Execute Disable Bit	Yes	Yes
Idle States	No	No
Intel 64	Yes	Yes
Intel Clear Video Technology	No	No
Intel Demand Based Switching	No	No
Intel Enhanced Halt State	No	No
Intel Rapid Storage Technology	No	No
Intel Trusted Execution Technology	No	No
Intel Virtualization Technology (VT-x)	No	No
Intel Virtualization Technology for Directed I/O (VT-d)	No	No
Intel® AES New Instructions (Intel® AES-NI)	No	No
Intel® Clear Video HD Technology (Intel® CVT HD)	No	No
Intel® Clear Video Technology for Mobile Internet Devices (Intel CVT for MID)	No	No
Intel® InTru™ 3D Technology	No	No
Intel® Insider™	No	No
Intel® Wireless Display (Intel® WiDi)	No	No
Processor ARK IDDiffers	27478	27480
Processor package size	37.5 x 37.5 mm	37.5 x 37.5 mm
Supported instruction setsKnown for one	Unknown — not stated by the source	SSE4.1/4.2
Thermal Monitoring TechnologiesDiffers	No	Yes
Intel® Turbo Boost Technology	No	No
Intel® Hyper Threading Technology (Intel® HT Technology)	Yes	Yes
Intel® Quick Sync Video Technology	No	No
Intel® My WiFi Technology (Intel® MWT)	No	No
Intel® Anti-Theft Technology (Intel® AT)	No	No
Conflict-Free processor	No	No
Intel Dual Display Capable TechnologyKnown for one	No	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 VT-x with Extended Page Tables (EPT)Known for one	No	Unknown — not stated by the source
Audioidentical
Audio system	SoundMAX Cadenza	SoundMAX Cadenza
Weight & dimensions4 differ
WidthDiffers	442 mm	309 mm
DepthDiffers	401 mm	359 mm
HeightDiffers	146 mm	85 mm
WeightDiffers	14 kg	8.5 kg
Other features1 differ
Security featuresDiffers	-Parallel port I/O control -Configuration password -Diskette boot inhibit -Diskette I/O control -Hardfile I/O control -Boot sequence control -Boot without keyboard or mouse -Power on password -Security slot (for attachment of optional cable lock) -Serial port I/O control -U-Bolt anchoring feature	-Boot without keyboard or mouse -Configuration password -Diskette Boot inhibit -Diskette I/O control -Hard disk drive password -Hard drive I/O control -Parallel port I/O control -Power on password -Security slot (for attachment of optional cable lock) -Serial port I/O control -U-Bolt anchoring featu

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