Intel Xeon L5640 vs E5645

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Combined performance score

Xeon E5645
3.29
+9.7%

E5645 outperforms L5640 by 10% in our combined benchmark results.

General info

Comparing Xeon E5645 and Xeon L5640 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking14691522
Place by popularitynot in top-100not in top-100
Value for money0.981.77
Market segmentServerServer
Architecture codenameWestmere-EP (2010−2011)Westmere-EP (2010−2011)
Release date16 March 2010 (14 years old)16 March 2010 (14 years old)
Launch price (MSRP)$294$200
Current price$250 (0.9x MSRP)$113 (0.6x MSRP)
Value for money

Performance per price, higher is better.

Xeon L5640 has 81% better value for money than Xeon E5645.

Technical specs

Xeon E5645 and Xeon L5640 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores6 (Hexa-Core)6 (Hexa-Core)
Threads1212
Base clock speed2.4 GHz2.26 GHz
Boost clock speed2.67 GHz2.8 GHz
L1 cache64 KB (per core)64 KB (per core)
L2 cache256 KB (per core)256 KB (per core)
L3 cache12 MB (shared)12 MB (shared)
Chip lithography32 nm32 nm
Die size239 mm2239 mm2
Maximum core temperature76 °C69 °C
Number of transistors1,170 million1,170 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplierNoNo

Compatibility

Information on Xeon E5645 and Xeon L5640 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration22
SocketFCLGA1366,LGA1366FCLGA1366,LGA1366
Power consumption (TDP)80 Watt60 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and Xeon L5640. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.2Intel® SSE4.2
AES-NI++
Enhanced SpeedStep (EIST)++
Turbo Boost Technology1.01.0
Hyper-Threading Technology++
Idle States++
Thermal Monitoring--
Demand Based Switching++
PAE40 Bit40 Bit
StatusDiscontinuedDiscontinued

Security technologies

Xeon E5645 and Xeon L5640 technologies aimed at improving security, for example, by protecting against hacks.

TXT++
EDB++

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5645 and Xeon L5640 are enumerated here.

VT-d++
VT-x++
EPT++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and Xeon L5640. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3
Maximum memory size288 GB288 GB
Max memory channels33
Maximum memory bandwidth32 GB/s32 GB/s
ECC memory support++

Peripherals

Specifications and connection of peripherals supported by Xeon E5645 and Xeon L5640.

PCIe version2.02.0

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Xeon E5645 3.29
+9.7%
Xeon L5640 3.00

E5645 outperforms L5640 by 10% in our combined benchmark results.


Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Benchmark coverage: 68%

Xeon E5645 5046
+9.6%
Xeon L5640 4606

E5645 outperforms L5640 by 10% in Passmark.

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Benchmark coverage: 42%

Xeon E5645 359
Xeon L5640 448
+24.8%

L5640 outperforms E5645 by 25% in GeekBench 5 Single-Core.

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Benchmark coverage: 42%

Xeon E5645 1681
Xeon L5640 2658
+58.1%

L5640 outperforms E5645 by 58% in GeekBench 5 Multi-Core.

Gaming performance

Advantages and disadvantages


Performance score 3.29 3.00
Cost $294 $200
Power consumption (TDP) 80 Watt 60 Watt

We couldn't decide between Xeon E5645 and Xeon L5640. The differences in performance seem too small.


Should you still have questions on choice between Xeon E5645 and Xeon L5640, ask them in Comments section, and we shall answer.

User ratings

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Intel Xeon E5645
Xeon E5645
Intel Xeon L5640
Xeon L5640

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Questions and comments

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