Intel Xeon X5687 vs Intel Xeon E5645

Comparative analysis of Intel Xeon X5687 and Intel Xeon E5645 processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Security & Reliability, Advanced Technologies, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, CompuBench 1.5 Desktop - Face Detection (mPixels/s), CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s), CompuBench 1.5 Desktop - T-Rex (Frames/s), CompuBench 1.5 Desktop - Video Composition (Frames/s), CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s), Geekbench 4 - Single Core, Geekbench 4 - Multi-Core.

Intel Xeon X5687

Intel Xeon E5645

Differences

Reasons to consider the Intel Xeon X5687

CPU is newer: launch date 11 month(s) later
Around 45% higher clock speed: 3.86 GHz vs 2.67 GHz
Around 6% higher maximum core temperature: 80.4°C vs 76.2°C
Around 41% better performance in PassMark - Single thread mark: 1658 vs 1178
Around 3% better performance in PassMark - CPU mark: 9406 vs 9164
Around 26% better performance in CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s): 62.153 vs 49.224

Specifications (specs)
Launch date	February 2011 vs March 2010
Maximum frequency	3.86 GHz vs 2.67 GHz
Maximum core temperature	80.4°C vs 76.2°C
Benchmarks
PassMark - Single thread mark	1658 vs 1178
PassMark - CPU mark	9406 vs 9164
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)	62.153 vs 49.224

Reasons to consider the Intel Xeon E5645

2 more cores, run more applications at once: 6 vs 4
4 more threads: 12 vs 8
Around 50% more L1 cache; more data can be stored in the L1 cache for quick access later
Around 50% more L2 cache; more data can be stored in the L2 cache for quick access later
Around 63% lower typical power consumption: 80 Watt vs 130 Watt
Around 94% better performance in CompuBench 1.5 Desktop - Face Detection (mPixels/s): 2.308 vs 1.191
Around 62% better performance in CompuBench 1.5 Desktop - T-Rex (Frames/s): 0.623 vs 0.384
7.5x better performance in CompuBench 1.5 Desktop - Video Composition (Frames/s): 3.664 vs 0.49
2.1x better performance in CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s): 11.094 vs 5.238

Specifications (specs)
Number of cores	6 vs 4
Number of threads	12 vs 8
L1 cache	64 KB (per core) vs 64 KB (per core)
L2 cache	256 KB (per core) vs 256 KB (per core)
Thermal Design Power (TDP)	80 Watt vs 130 Watt
Benchmarks
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	2.308 vs 1.191
CompuBench 1.5 Desktop - T-Rex (Frames/s)	0.623 vs 0.384
CompuBench 1.5 Desktop - Video Composition (Frames/s)	3.664 vs 0.49
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	11.094 vs 5.238

Compare benchmarks

CPU 1: Intel Xeon X5687
CPU 2: Intel Xeon E5645

PassMark - Single thread mark

CPU 1

CPU 2

1658

1178

PassMark - CPU mark

CPU 1

CPU 2

9406

9164

CompuBench 1.5 Desktop - Face Detection (mPixels/s)

CPU 1

CPU 2

1.191

2.308

CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)

CPU 1

CPU 2

62.153

49.224

CompuBench 1.5 Desktop - T-Rex (Frames/s)

CPU 1

CPU 2

0.384

0.623

CompuBench 1.5 Desktop - Video Composition (Frames/s)

CPU 1

CPU 2

0.49

3.664

CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)

CPU 1

CPU 2

5.238

11.094

Name	Intel Xeon X5687	Intel Xeon E5645
PassMark - Single thread mark	1658	1178
PassMark - CPU mark	9406	9164
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	1.191	2.308
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)	62.153	49.224
CompuBench 1.5 Desktop - T-Rex (Frames/s)	0.384	0.623
CompuBench 1.5 Desktop - Video Composition (Frames/s)	0.49	3.664
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	5.238	11.094
Geekbench 4 - Single Core		442
Geekbench 4 - Multi-Core		2731

Compare specifications (specs)

	Intel Xeon X5687	Intel Xeon E5645
Essentials
Architecture codename	Westmere EP	Westmere EP
Launch date	February 2011	March 2010
Launch price (MSRP)	$121	$294
Place in performance rating	2519	2489
Price now	$51.66	$239.95
Processor Number	X5687	E5645
Series	Legacy Intel® Xeon® Processors	Legacy Intel® Xeon® Processors
Status	Discontinued	Launched
Value for money (0-100)	40.41	7.96
Vertical segment	Server	Server
Performance
64 bit support
Base frequency	3.60 GHz	2.40 GHz
Bus Speed	6.4 GT/s QPI	5.86 GT/s QPI
Die size	239 mm	239 mm
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	256 KB (per core)
L3 cache	12288 KB (shared)	12288 KB (shared)
Manufacturing process technology	32 nm	32 nm
Maximum core temperature	80.4°C	76.2°C
Maximum frequency	3.86 GHz	2.67 GHz
Number of cores	4	6
Number of QPI Links	2	2
Number of threads	8	12
Transistor count	1170 million	1170 million
VID voltage range	0.750V-1.350V	0.750V-1.350V
Memory
ECC memory support
Max memory channels	3	3
Maximum memory bandwidth	32 GB/s	32 GB/s
Maximum memory size	288 GB	288 GB
Supported memory types	DDR3 800/1066/1333	DDR3 800/1066/1333
Compatibility
Low Halogen Options Available
Max number of CPUs in a configuration	2	2
Package Size	42.5mm X 45mm	42.5mm X 45mm
Sockets supported	FCLGA1366	FCLGA1366
Thermal Design Power (TDP)	130 Watt	80 Watt
Security & Reliability
Execute Disable Bit (EDB)
Intel® Trusted Execution technology (TXT)
Advanced Technologies
Enhanced Intel SpeedStep® technology
Idle States
Instruction set extensions	Intel® SSE4.2	Intel® SSE4.2
Intel 64
Intel® AES New Instructions
Intel® Demand Based Switching
Intel® Hyper-Threading technology
Intel® Turbo Boost technology
Physical Address Extensions (PAE)	40-bit	40-bit
Thermal Monitoring
Virtualization
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Intel® VT-x with Extended Page Tables (EPT)