Xeon E5640 vs X5647

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Aggregate performance score

Xeon X5647
2011
4 cores / 8 threads, 130 Watt
2.80
+17.6%
Xeon E5640
2010
4 cores / 8 threads, 80 Watt
2.38

Xeon X5647 outperforms Xeon E5640 by a moderate 18% based on our aggregate benchmark results.

Primary details

Comparing Xeon X5647 and Xeon E5640 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking16841793
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation1.780.85
Market segmentServerServer
Power efficiency2.042.81
Architecture codenameWestmere-EP (2010−2011)Westmere-EP (2010−2011)
Release date14 February 2011 (13 years ago)16 March 2010 (14 years ago)
Launch price (MSRP)$175$49

Cost-effectiveness evaluation

Performance per price, higher is better.

Xeon X5647 has 109% better value for money than Xeon E5640.

Detailed specifications

Xeon X5647 and Xeon E5640 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 cores4 (Quad-Core)4 (Quad-Core)
Threads88
Base clock speed2.93 GHz2.66 GHz
Boost clock speed3.2 GHz2.93 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 temperature80 °C78 °C
Number of transistors1,170 million1,170 million
64 bit support++
Windows 11 compatibility--

Compatibility

Information on Xeon X5647 and Xeon E5640 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)130 Watt80 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon X5647 and Xeon E5640. 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++
Demand Based Switching++
PAE40 Bit40 Bit

Security technologies

Xeon X5647 and Xeon E5640 technologies aimed at improving security, for example, by protecting against hacks.

TXT++
EDB++

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon X5647 and Xeon E5640 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon X5647 and Xeon E5640. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3
Maximum memory size288 GB288 GB
Max memory channels33
Maximum memory bandwidth25.6 GB/s25.6 GB/s
ECC memory support++

Peripherals

Specifications and connection of peripherals supported by Xeon X5647 and Xeon E5640.

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 X5647 2.80
+17.6%
Xeon E5640 2.38

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.

Xeon X5647 4441
+17.4%
Xeon E5640 3782

Gaming performance

Pros & cons summary


Performance score 2.80 2.38
Recency 14 February 2011 16 March 2010
Power consumption (TDP) 130 Watt 80 Watt

Xeon X5647 has a 17.6% higher aggregate performance score, and an age advantage of 10 months.

Xeon E5640, on the other hand, has 62.5% lower power consumption.

The Xeon X5647 is our recommended choice as it beats the Xeon E5640 in performance tests.


Should you still have questions on choice between Xeon X5647 and Xeon E5640, ask them in Comments section, and we shall answer.

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Intel Xeon X5647
Xeon X5647
Intel Xeon E5640
Xeon E5640

Similar processor comparisons

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Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


3.9 17 votes

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4.2 34 votes

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Questions & comments

Here you can ask a question about Xeon X5647 or Xeon E5640, agree or disagree with our judgements, or report an error or mismatch.