Intel Xeon E5-2403 vs Intel Xeon E5645

Comparative analysis of Intel Xeon E5-2403 and Intel Xeon E5645 processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Peripherals, Security & Reliability, Advanced Technologies, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, Geekbench 4 - Single Core, Geekbench 4 - Multi-Core, 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).

Intel Xeon E5-2403

Intel Xeon E5645

Differences

Reasons to consider the Intel Xeon E5-2403

CPU is newer: launch date 2 year(s) 2 month(s) later
Around 33% higher maximum memory size: 384 GB vs 288 GB

Launch date	May 2012 vs March 2010
Maximum memory size	384 GB vs 288 GB

Reasons to consider the Intel Xeon E5645

2 more cores, run more applications at once: 6 vs 4
8 more threads: 12 vs 4
Around 48% higher clock speed: 2.67 GHz vs 1.8 GHz
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 20% more L3 cache; more data can be stored in the L3 cache for quick access later
Around 47% better performance in PassMark - Single thread mark: 1175 vs 802
3.9x better performance in PassMark - CPU mark: 9143 vs 2367

Specifications (specs)
Number of cores	6 vs 4
Number of threads	12 vs 4
Maximum frequency	2.67 GHz vs 1.8 GHz
L1 cache	64 KB (per core) vs 64 KB (per core)
L2 cache	256 KB (per core) vs 256 KB (per core)
L3 cache	12288 KB (shared) vs 10240 KB (shared)
Benchmarks
PassMark - Single thread mark	1175 vs 802
PassMark - CPU mark	9143 vs 2367

Compare benchmarks

CPU 1: Intel Xeon E5-2403
CPU 2: Intel Xeon E5645

PassMark - Single thread mark

CPU 1

CPU 2

802

1175

PassMark - CPU mark

CPU 1

CPU 2

2367

9143

Name	Intel Xeon E5-2403	Intel Xeon E5645
PassMark - Single thread mark	802	1175
PassMark - CPU mark	2367	9143
Geekbench 4 - Single Core		442
Geekbench 4 - Multi-Core		2731
CompuBench 1.5 Desktop - Face Detection (mPixels/s)		2.308
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)		49.224
CompuBench 1.5 Desktop - T-Rex (Frames/s)		0.623
CompuBench 1.5 Desktop - Video Composition (Frames/s)		3.664
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)		11.094

Compare specifications (specs)

	Intel Xeon E5-2403	Intel Xeon E5645
Essentials
Architecture codename	Sandy Bridge EN	Westmere EP
Launch date	May 2012	March 2010
Launch price (MSRP)	$230	$294
Place in performance rating	2486	2487
Price now	$364.97	$239.95
Processor Number	E5-2403	E5645
Series	Intel® Xeon® Processor E5 Family	Legacy Intel® Xeon® Processors
Status	Discontinued	Launched
Value for money (0-100)	2.84	7.96
Vertical segment	Server	Server
Performance
64 bit support
Base frequency	1.80 GHz	2.40 GHz
Bus Speed	6.4 GT/s QPI	5.86 GT/s QPI
Die size	294 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	10240 KB (shared)	12288 KB (shared)
Manufacturing process technology	32 nm	32 nm
Maximum frequency	1.8 GHz	2.67 GHz
Number of cores	4	6
Number of QPI Links	1	2
Number of threads	4	12
Transistor count	1270 million	1170 million
VID voltage range	0.6V-1.35V	0.750V-1.350V
Maximum core temperature		76.2°C
Memory
ECC memory support
Max memory channels	3	3
Maximum memory bandwidth	25 GB/s	32 GB/s
Maximum memory size	384 GB	288 GB
Supported memory types	DDR3 800/1066	DDR3 800/1066/1333
Compatibility
Low Halogen Options Available
Max number of CPUs in a configuration	2	2
Package Size	45mm x 42.5mm	42.5mm X 45mm
Sockets supported	FCLGA1356	FCLGA1366
Thermal Design Power (TDP)	80 Watt	80 Watt
Peripherals
Max number of PCIe lanes	24
PCI Express revision	3.0
Scalability	2S Only
Security & Reliability
Execute Disable Bit (EDB)
Intel® Identity Protection technology
Intel® Trusted Execution technology (TXT)
Advanced Technologies
Enhanced Intel SpeedStep® technology
Idle States
Instruction set extensions	Intel® AVX	Intel® SSE4.2
Intel 64
Intel® Advanced Vector Extensions (AVX)
Intel® AES New Instructions
Intel® Demand Based Switching
Intel® Flex Memory Access
Intel® Hyper-Threading technology
Intel® Turbo Boost technology
Thermal Monitoring
Physical Address Extensions (PAE)		40-bit
Virtualization
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Intel® VT-x with Extended Page Tables (EPT)