Ultra 7 265T vs Xeon E5645

Primary details

Comparing Xeon E5645 and Core Ultra 7 265T processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1603	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.27	no data
Market segment	Server	Desktop processor
Power efficiency	3.76	no data
Architecture codename	Westmere-EP (2010−2011)	Arrow Lake-S (2024−2025)
Release date	16 March 2010 (14 years ago)	January 2025
Launch price (MSRP)	$294	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5645 and Core Ultra 7 265T 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)	20 (Icosa-Core)
Threads	12	20
Base clock speed	2.4 GHz	1.5 GHz
Boost clock speed	2.67 GHz	5.3 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)	30 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 7 265T 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	1851
Power consumption (TDP)	80 Watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and Core Ultra 7 265T. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
AES-NI	+	+
AVX	-	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	1.0	no data
Hyper-Threading Technology	+	no data
TSX	-	+
Idle States	+	no data
Demand Based Switching	+	no data
PAE	40 Bit	no data

Security technologies

Xeon E5645 and Core Ultra 7 265T technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5645 and Core Ultra 7 265T are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and Core Ultra 7 265T. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR5
Maximum memory size	288 GB	no data
Max memory channels	3	no data
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

Arc Xe-LPG Graphics 64EU

Peripherals

Specifications and connection of peripherals supported by Xeon E5645 and Core Ultra 7 265T.

PCIe version	2.0	5.0
PCI Express lanes	no data	20

Pros & cons summary

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Physical cores	6	20
Threads	12	20
Chip lithography	32 nm	3 nm
Power consumption (TDP)	80 Watt	35 Watt

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