Product comparison · 2 cpus

Dell Xeon E5645 vs Dell Xeon L5520

38specifications compared
15differ
23identical
10known for one product only

Key differences

Processor model
- Xeon E5645:E5645
- Xeon L5520:L5520
Processor base frequency
- Xeon E5645:2.4 GHz
- Xeon L5520:2.26 GHz
Processor cores
- Xeon E5645:6
- Xeon L5520:4
Processor lithography
- Xeon E5645:32 nm
- Xeon L5520:45 nm
Processor threads
- Xeon E5645:12
- Xeon L5520:8
Processor cache
- Xeon E5645:12 MB
- Xeon L5520:8 MB
Thermal Design Power (TDP)
- Xeon E5645:80 W
- Xeon L5520:60 W
VID Voltage Range
- Xeon E5645:0.75 - 1.35 V
- Xeon L5520:0.750 - 1.350 V

Side by side

Differences highlightedShow differences only

Comparison of Xeon E5645, Xeon L5520
48 specifications	A Dell Xeon E5645 View product	B Dell Xeon L5520 View product
Processor10 differ
Processor family	Intel® Xeon® 5000 Sequence	Intel® Xeon® 5000 Sequence
Processor modelDiffers	E5645	L5520
Processor base frequencyDiffers	2.4 GHz	2.26 GHz
Processor coresDiffers	6	4
Processor socket	Socket B (LGA 1366)	Socket B (LGA 1366)
Processor lithographyDiffers	32 nm	45 nm
Component for	Server/workstation	Server/workstation
Processor threadsDiffers	12	8
System bus rate	5.86 GT/s	5.86 GT/s
Processor operating modes	64-bit	64-bit
Processor cacheDiffers	12 MB	8 MB
Processor cache type	L3	L3
L3 cache speedKnown for one	Unknown — not stated by the source	2.26 GHz
Thermal Design Power (TDP)Differs	80 W	60 W
VID Voltage RangeDiffers	0.75 - 1.35 V	0.750 - 1.350 V
SteppingDiffers	B1	D0
Bus type	QPI	QPI
CPU multiplier (bus/core ratio)Known for one	Unknown — not stated by the source	17
Number of QPI links	2	2
Memory bandwidth supported by processor (max)Differs	32 GB/s	25.6 GB/s
Processor boost frequencyKnown for one	2.67 GHz	Unknown — not stated by the source
Memory2 differ
Maximum internal memory supported by processorDiffers	288 GB	144 GB
Memory types supported by processor	DDR3-SDRAM	DDR3-SDRAM
Memory clock speeds supported by processorDiffers	800,1066,1333 MHz	800,1066 MHz
Memory channels	Triple-channel	Triple-channel
ECC	Yes	Yes
Graphicsidentical
On-board graphics card	No	No
Features1 differ
Execute Disable BitDiffers	No	Yes
Idle States	Yes	Yes
Market segment	Server	Server
Number of Processing Die TransistorsKnown for one	Unknown — not stated by the source	731 M
Processing Die sizeKnown for one	Unknown — not stated by the source	263 mm²
Embedded options availableKnown for one	Unknown — not stated by the source	No
Physical Address Extension (PAE)Known for one	Unknown — not stated by the source	Yes
Supported instruction setsKnown for one	SSE4.2	Unknown — not stated by the source
Processor special features1 differ
Enhanced Intel SpeedStep Technology	Yes	Yes
Intel Trusted Execution TechnologyDiffers	Yes	No
Intel® Hyper Threading Technology (Intel® HT Technology)	Yes	Yes
Intel® Smart Cache	Yes	Yes
Intel Demand Based Switching	Yes	Yes
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)	Yes	Yes
Intel® AES New Instructions (Intel® AES-NI)Known for one	Yes	Unknown — not stated by the source
Intel® Turbo Boost TechnologyKnown for one	Yes	Unknown — not stated by the source
Operational conditions1 differ
TcaseDiffers	76.2 °C	70 °C
Weight & dimensionsidentical
Processor package size	42.5 mm	42.5 mm
Other featuresidentical
Intel® Virtualization Technology (Intel® VT)	VT-d, VT-x	VT-d, VT-x

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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