Product comparison · 2 pcs/workstations

Lenovo ThinkStation D20 (4155-79G), UK vs Lenovo ThinkStation E20 + ThinkVision L2251p

82specifications compared
41differ
41identical
46known for one product only

Key differences

Processor family
- ThinkStation D20 (4155-79G), UK:Intel® Xeon® 5000 Sequence
- ThinkStation E20 + ThinkVision L2251p:Intel® Core™ i3
Processor model
- ThinkStation D20 (4155-79G), UK:E5507
- ThinkStation E20 + ThinkVision L2251p:i3-530
Processor cores
- ThinkStation D20 (4155-79G), UK:4
- ThinkStation E20 + ThinkVision L2251p:2
Processor frequency
- ThinkStation D20 (4155-79G), UK:2.26 GHz
- ThinkStation E20 + ThinkVision L2251p:2.93 GHz
Bus type
- ThinkStation D20 (4155-79G), UK:QPI
- ThinkStation E20 + ThinkVision L2251p:DMI
System bus rate
- ThinkStation D20 (4155-79G), UK:4.8 GT/s
- ThinkStation E20 + ThinkVision L2251p:2.5 GT/s
Processor lithography
- ThinkStation D20 (4155-79G), UK:45 nm
- ThinkStation E20 + ThinkVision L2251p:32 nm
Processor codename
- ThinkStation D20 (4155-79G), UK:Nehalem EP
- ThinkStation E20 + ThinkVision L2251p:Clarkdale

Side by side

Differences highlightedShow differences only

Comparison of ThinkStation D20 (4155-79G), UK, ThinkStation E20 + ThinkVision L2251p
128 specifications	A Lenovo ThinkStation D20 (4155-79G), UK View product	B Lenovo ThinkStation E20 + ThinkVision L2251p View product
Processor17 differ
Processor familyDiffers	Intel® Xeon® 5000 Sequence	Intel® Core™ i3
Processor modelDiffers	E5507	i3-530
Processor coresDiffers	4	2
Processor frequencyDiffers	2.26 GHz	2.93 GHz
Bus typeDiffers	QPI	DMI
System bus rateDiffers	4.8 GT/s	2.5 GT/s
Processor lithographyDiffers	45 nm	32 nm
Processor seriesDiffers	Intel Xeon 5500 Series	Intel Core i3-500 Desktop Series
Processor codenameDiffers	Nehalem EP	Clarkdale
Thermal Design Power (TDP)Differs	80 W	73 W
TcaseDiffers	76 °C	72.6 °C
Number of QPI linksKnown for one	2	Unknown — not stated by the source
Processor socketDiffers	Socket B (LGA 1366)	LGA 1156 (Socket H)
SteppingDiffers	D0	C2
Maximum internal memory supported by processorDiffers	144 GB	16 GB
Memory types supported by processorDiffers	DDR3-SDRAM	DDR3 1066/1333
Memory clock speeds supported by processorKnown for one	800 MHz	Unknown — not stated by the source
Memory bandwidth supported by processor (max)Differs	19.2 GB/s	21 GB/s
ECC supported by processorDiffers	Yes	No
Processor generationKnown for one	Unknown — not stated by the source	Intel® Core™ i3
Maximum number of PCI Express lanesKnown for one	Unknown — not stated by the source	16
PCI Express configurationsKnown for one	Unknown — not stated by the source	1x16, 2x8
PCI Express slots versionKnown for one	Unknown — not stated by the source	2.0
Number of Processing Die TransistorsKnown for one	Unknown — not stated by the source	382 M
Processing Die sizeKnown for one	Unknown — not stated by the source	81 mm²
CPU multiplier (bus/core ratio)Known for one	Unknown — not stated by the source	22
Memory4 differ
Internal memoryDiffers	3 GB	2 GB
Maximum internal memoryDiffers	96 GB	16 GB
Memory layout (slots x size)Known for one	3 x 1 GB	Unknown — not stated by the source
Memory clock speedDiffers	1066 MHz	1333 MHz
Memory channelsDiffers	Triple-channel	Dual-channel
Memory typeKnown for one	DDR3 SDRAM	Unknown — not stated by the source
Storage1 differ
Optical drive typeKnown for one	DVD-RW	Unknown — not stated by the source
HDD interfaceDiffers	SATA II	SATA
Compatible memory cardsKnown for one	CF, MMC, SD, xD	Unknown — not stated by the source
Storage drive typeKnown for one	500GB SATA/ 7200	Unknown — not stated by the source
HDD speedKnown for one	Unknown — not stated by the source	7200 RPM
Performanceidentical
Motherboard chipsetKnown for one	Unknown — not stated by the source	Intel® 3450
Optical driveidentical
CD read speedKnown for one	40x	Unknown — not stated by the source
Networkidentical
Modem typeKnown for one	No	Unknown — not stated by the source
Ports & interfaces3 differ
Ethernet LAN (RJ-45) portsDiffers	2	1
Line-inKnown for one	Yes	Unknown — not stated by the source
VGA (D-Sub) ports quantityDiffers	0	1
PS/2 ports quantityDiffers	0	2
Firewire (IEEE 1394) portsKnown for one	2	Unknown — not stated by the source
Expansion slotsidentical
PCI Express x16 slotsKnown for one	1	Unknown — not stated by the source
PCI slotsKnown for one	2	Unknown — not stated by the source
Expansion slotsKnown for one	PCI Express 2.0	Unknown — not stated by the source
Power1 differ
Power requirementsKnown for one	100-240V; 50/60Hz	Unknown — not stated by the source
Power supplyDiffers	1060 W	280 W
Power supply typeKnown for one	Unknown — not stated by the source	100 - 240 VAC, 50/60 Hz
Designidentical
Form factorKnown for one	Tower Tower (6x9)	Unknown — not stated by the source
Software1 differ
Operating system installedDiffers	Windows 7 Professional	Windows XP Professional
Optional operating system suppliedKnown for one	Windows XP Professional	Unknown — not stated by the source
Compatible operating systemsKnown for one	Windows XP Pro SP1a/SP2a 32/64-bit Red Hat Enterprise Linux 5.0 Windows Vista 32/64-bit Windows Vista Enterprise 32/64-bit Windows Vista Ultimate 32/64-bit	Unknown — not stated by the source
Display1 differ
Display includedDiffers	No	Yes
Display diagonalKnown for one	Unknown — not stated by the source	55.9 cm (22")
ResolutionKnown for one	Unknown — not stated by the source	1680 x 1050 pixels
Processor special features8 differ
Intel Demand Based SwitchingDiffers	Yes	No
Intel Dual Display Capable TechnologyDiffers	No	Yes
Intel FDI TechnologyDiffers	No	Yes
Intel Virtualization Technology for Directed I/O (VT-d)Differs	Yes	No
Intel® Clear Video HD Technology (Intel® CVT HD)Differs	No	Yes
Intel® Smart CacheKnown for one	Yes	Unknown — not stated by the source
Physical Address Extension (PAE)Differs	Yes	36 bit
Processor ARK IDDiffers	37100	46472
Processor codeKnown for one	SLBKC	Unknown — not stated by the source
Intel® Hyper Threading Technology (Intel® HT Technology)Differs	No	Yes
CPU configuration (max)Known for one	Unknown — not stated by the source	1
Graphics & IMC lithographyKnown for one	Unknown — not stated by the source	45 nm
Processor package sizeKnown for one	Unknown — not stated by the source	37.5 x 37.5 mm
Supported instruction setsKnown for one	Unknown — not stated by the source	SSE4.2
Audio1 differ
Audio systemDiffers	ADI 1988 A	Realtek ALC662
Weight & dimensions4 differ
WidthDiffers	210 mm	175 mm
DepthDiffers	579 mm	430.8 mm
HeightDiffers	485 mm	425.2 mm
WeightDiffers	24.9 kg	11.2 kg
Packaging contentidentical
Mouse includedKnown for one	Yes	Unknown — not stated by the source
Keyboardidentical
Pointing deviceKnown for one	USB Optical Wheel Mouse	Unknown — not stated by the source
Keyboard typeKnown for one	Preferred Pro USB	Unknown — not stated by the source
Featuresidentical
Manageability featuresKnown for one	Image Ultra - HIIT Compliant Drivers - Vista Only, Secure Data Disposal, ThinkVantage Image Ultra Builder - Vista Support, ThinkVantage Update Builder, ThinkVantage Update Retriever	Unknown — not stated by the source
Other featuresidentical
Security featuresKnown for one	Boot sequence control, Boot without keyboard or mouse, Configuration password, Cover key lock, Diskette Boot inhibit, Diskette I/O control, Hardfile I/O control, Padlock loop, Power on password, Security slot (for attachment of optional cable lock), Ser	Unknown — not stated by the source
Graphicsidentical
On-board graphics cardKnown for one	Unknown — not stated by the source	Yes
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	733 MHz

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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