EPYC 9745 vs Xeon E5649

Primary details

Comparing Xeon E5649 and EPYC 9745 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1522	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.56	no data
Market segment	Server	Server
Power efficiency	4.23	no data
Architecture codename	Westmere-EP (2010−2011)	Turin (2024)
Release date	14 February 2011 (13 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	$45	$12,141

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5649 and EPYC 9745 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)	128
Threads	12	256
Base clock speed	2.53 GHz	2.4 GHz
Boost clock speed	2.93 GHz	3.7 GHz
L1 cache	64 KB (per core)	80 KB (per core)
L2 cache	256 KB (per core)	1 MB (per core)
L3 cache	12288 KB (shared)	256 MB (shared)
Chip lithography	32 nm	3 nm
Die size	239 mm2	no data
Maximum core temperature	76 °C	no data
Number of transistors	1,170 million	no data
64 bit support	+	+
Windows 11 compatibility	-	no data

Compatibility

Information on Xeon E5649 and EPYC 9745 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	2
Socket	FCLGA1366	SP5
Power consumption (TDP)	80 Watt	400 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5649 and EPYC 9745. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
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 E5649 and EPYC 9745 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 E5649 and EPYC 9745 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 E5649 and EPYC 9745. 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

N/A

Peripherals

Specifications and connection of peripherals supported by Xeon E5649 and EPYC 9745.

PCIe version	2.0	5.0
PCI Express lanes	no data	128

Pros & cons summary

---

Recency	14 February 2011	10 October 2024
Physical cores	6	128
Threads	12	256
Chip lithography	32 nm	3 nm
Power consumption (TDP)	80 Watt	400 Watt

---

Should you still have questions on choice between Xeon E5649 and EPYC 9745, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---