Ryzen 9 7900X vs Xeon E5645

Primary details

Comparing Xeon E5645 and Ryzen 9 7900X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1605	123
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.25	no data
Market segment	Server	Desktop processor
Power efficiency	3.76	18.11
Architecture codename	Westmere-EP (2010−2011)	Raphael (Zen4) (2022−2023)
Release date	16 March 2010 (14 years ago)	27 September 2022 (2 years ago)
Launch price (MSRP)	$294	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5645 and Ryzen 9 7900X 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)	12 (Dodeca-Core)
Threads	12	24
Base clock speed	2.4 GHz	4.7 GHz
Boost clock speed	2.67 GHz	5.6 GHz
L1 cache	64 KB (per core)	64K (per core)
L2 cache	256 KB (per core)	1 MB (per core)
L3 cache	12 MB (shared)	64 MB (shared)
Chip lithography	32 nm	5 nm
Die size	239 mm2	2x 70 (CCD) mm2 + 122 (I/O) mm2
Maximum core temperature	76 °C	95 °C
Maximum case temperature (TCase)	no data	47 °C
Number of transistors	1,170 million	CCD: 6,5 Mrd + IOD: 3,4 Mrd Million
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	-	+

Compatibility

Information on Xeon E5645 and Ryzen 9 7900X 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	AM5
Power consumption (TDP)	80 Watt	170 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and Ryzen 9 7900X. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	5 nm (CCD), 6 nm (I/O) nm, 0.650 - 1.475V
AES-NI	+	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	1.0	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Demand Based Switching	+	no data
PAE	40 Bit	no data
Precision Boost 2	no data	+

Security technologies

Xeon E5645 and Ryzen 9 7900X technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5645 and Ryzen 9 7900X are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and Ryzen 9 7900X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR5-5200
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

AMD Radeon Graphics (Ryzen 7000)

Peripherals

Specifications and connection of peripherals supported by Xeon E5645 and Ryzen 9 7900X.

PCIe version	2.0	5.0
PCI Express lanes	no data	24

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	32.54
Recency	16 March 2010	27 September 2022
Physical cores	6	12
Threads	12	24
Chip lithography	32 nm	5 nm
Power consumption (TDP)	80 Watt	170 Watt

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Should you still have questions on choice between Xeon E5645 and Ryzen 9 7900X, ask them in Comments section, and we shall answer.

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