Ultra 5 245KF vs Xeon E5645

Primary details

Comparing Xeon E5645 and Core Ultra 5 245KF processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1618	176
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.38	82.57
Market segment	Server	Desktop processor
Power efficiency	3.76	20.94
Architecture codename	Westmere-EP (2010−2011)	Arrow Lake-S (2024−2025)
Release date	16 March 2010 (14 years ago)	24 October 2024 (less than a year ago)
Launch price (MSRP)	$294	$294

Cost-effectiveness evaluation

Performance per price, higher is better.

Ultra 5 245KF has 5883% better value for money than Xeon E5645.

Detailed specifications

Xeon E5645 and Core Ultra 5 245KF 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 cores	6 (Hexa-Core)	14 (Tetradeca-Core)
Performance-cores	no data	6
Efficient-cores	no data	8
Threads	12	14
Base clock speed	2.4 GHz	4.2 GHz
Boost clock speed	2.67 GHz	5.2 GHz
L1 cache	64 KB (per core)	112 KB (per core)
L2 cache	256 KB (per core)	3 MB (per core)
L3 cache	12 MB (shared)	24 MB (shared)
Chip lithography	32 nm	3 nm
Die size	239 mm2	243 mm2
Maximum core temperature	76 °C	no data
Number of transistors	1,170 million	17,800 million
64 bit support	+	+
Windows 11 compatibility	-	no data

Compatibility

Information on Xeon E5645 and Core Ultra 5 245KF 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 configuration	2	1
Socket	FCLGA1366,LGA1366	FCLGA1851
Power consumption (TDP)	80 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and Core Ultra 5 245KF. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	1.0	2.0
Hyper-Threading Technology	+	no data
TSX	-	+
Idle States	+	+
Thermal Monitoring	-	+
Demand Based Switching	+	no data
PAE	40 Bit	no data
Deep Learning Boost	-	+
Supported AI Software Frameworks	-	OpenVINO™, WindowsML, DirectML, ONNX RT, WebNN

Security technologies

Xeon E5645 and Core Ultra 5 245KF technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	no data	+
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5645 and Core Ultra 5 245KF are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and Core Ultra 5 245KF. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR5-6400
Maximum memory size	288 GB	192 GB
Max memory channels	3	2
Maximum memory bandwidth	32 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

N/A

Peripherals

Specifications and connection of peripherals supported by Xeon E5645 and Core Ultra 5 245KF.

PCIe version	2.0	5.0 and 4.0
PCI Express lanes	no data	20

Synthetic benchmark performance

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

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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.

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Pros & cons summary

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Performance score	3.18	27.68
Recency	16 March 2010	24 October 2024
Physical cores	6	14
Threads	12	14
Chip lithography	32 nm	3 nm
Power consumption (TDP)	80 Watt	125 Watt

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Should you still have questions on choice between Xeon E5645 and Core Ultra 5 245KF, ask them in Comments section, and we shall answer.

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