Product comparison · 2 pcs/workstations

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

82specifications compared
41differ
41identical
38known for one product only

Key differences

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

Side by side

Differences highlightedShow differences only

Comparison of ThinkStation D20 (4155-79G), IT, ThinkStation E20 + ThinkVision L2251p
120 specifications	A Lenovo ThinkStation D20 (4155-79G), IT View product	B Lenovo ThinkStation E20 + ThinkVision L2251p View product
Processor17 differ
Processor manufacturer	Intel	Intel
Processor familyDiffers	Intel® Xeon® 5000 Sequence	Intel® Core™ i3
Processor generationKnown for one	Unknown — not stated by the source	Intel® Core™ i3
Processor modelDiffers	E5507	i3-530
Processor coresDiffers	4	2
Processor threads	4	4
Processor frequencyDiffers	2.26 GHz	2.93 GHz
Processor cache	4 MB	4 MB
Processor cache type	Smart Cache	Smart Cache
Bus typeDiffers	QPI	DMI
FSB Parity	No	No
System bus rateDiffers	4.8 GT/s	2.5 GT/s
Processor lithographyDiffers	45 nm	32 nm
Processor operating modes	64-bit	64-bit
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
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
Processor socketDiffers	Socket B (LGA 1366)	LGA 1156 (Socket H)
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
SteppingDiffers	D0	C2
Maximum internal memory supported by processorDiffers	144 GB	16 GB
Memory types supported by processorDiffers	DDR3-SDRAM	DDR3 1066/1333
Memory bandwidth supported by processor (max)Differs	19.2 GB/s	21 GB/s
ECC supported by processorDiffers	Yes	No
Number of QPI linksKnown for one	2	Unknown — not stated by the source
Memory clock speeds supported by processorKnown for one	800 MHz	Unknown — not stated by the source
Memory4 differ
Internal memoryDiffers	3 GB	2 GB
Maximum internal memoryDiffers	96 GB	16 GB
Internal memory type	DDR3-SDRAM	DDR3-SDRAM
Memory clock speedDiffers	1066 MHz	1333 MHz
Memory channelsDiffers	Triple-channel	Dual-channel
Memory layout (slots x size)Known for one	3 x 1 GB	Unknown — not stated by the source
Storage1 differ
HDD capacity	500 GB	500 GB
HDD interfaceDiffers	SATA II	SATA
HDD speedKnown for one	Unknown — not stated by the source	7200 RPM
Card reader integrated	Yes	Yes
Optical drive typeKnown for one	DVD-RW	Unknown — not stated by the source
Compatible memory cardsKnown for one	CF, MMC, SD, xD	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
Performanceidentical
Product type	Workstation	Workstation
Motherboard chipsetKnown for one	Unknown — not stated by the source	Intel® 3450
Ports & interfaces3 differ
USB 2.0 ports quantity	10	10
Ethernet LAN (RJ-45) portsDiffers	2	1
Headphone outputs	1	1
Microphone in	Yes	Yes
VGA (D-Sub) ports quantityDiffers	0	1
PS/2 ports quantityDiffers	0	2
eSATA ports quantity	1	1
Serial ports quantity	1	1
Parallel ports quantity	0	0
Line-inKnown for one	Yes	Unknown — not stated by the source
Firewire (IEEE 1394) portsKnown for one	2	Unknown — not stated by the source
Power1 differ
Power supply typeKnown for one	Unknown — not stated by the source	100 - 240 VAC, 50/60 Hz
Power supplyDiffers	1060 W	280 W
Power requirementsKnown for one	100-240V; 50/60Hz	Unknown — not stated by the source
Designidentical
Chassis type	Tower	Tower
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
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
Graphics & IMC lithographyKnown for one	Unknown — not stated by the source	45 nm
Idle States	Yes	Yes
Intel 64	Yes	Yes
Intel Clear Video Technology	No	No
Intel Demand Based SwitchingDiffers	Yes	No
Intel Dual Display Capable TechnologyDiffers	No	Yes
Intel Enhanced Halt State	Yes	Yes
Intel FDI TechnologyDiffers	No	Yes
Intel Fast Memory Access	No	No
Intel Flex Memory Access	No	No
Intel Rapid Storage Technology	No	No
Intel Trusted Execution Technology	No	No
Intel VT-x with Extended Page Tables (EPT)	Yes	Yes
Intel Virtualization Technology (VT-x)	Yes	Yes
Intel Virtualization Technology for Directed I/O (VT-d)Differs	Yes	No
Intel® AES New Instructions (Intel® AES-NI)	No	No
Intel® Clear Video HD Technology (Intel® CVT HD)Differs	No	Yes
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
Physical Address Extension (PAE)Differs	Yes	36 bit
Processor ARK IDDiffers	37100	46472
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
Thermal Monitoring Technologies	No	No
Intel® Turbo Boost Technology	No	No
Intel® Hyper Threading Technology (Intel® HT Technology)Differs	No	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® Smart CacheKnown for one	Yes	Unknown — not stated by the source
Processor codeKnown for one	SLBKC	Unknown — not stated by the source
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
Optical driveidentical
CD read speedKnown for one	40x	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
Packaging contentidentical
Mouse includedKnown for one	Yes	Unknown — not stated by the source
Keyboardidentical
Keyboard typeKnown for one	Preferred Pro USB	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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