A6-6420K vs Xeon E5645

Primary details

Comparing Xeon E5645 and A6-6420K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1603	2460
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	1.44
Architecture codename	Westmere-EP (2010−2011)	Richland (2013−2014)
Release date	16 March 2010 (14 years ago)	January 2014 (10 years ago)
Launch price (MSRP)	$294	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5645 and A6-6420K 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)	2 (Dual-core)
Threads	12	2
Base clock speed	2.4 GHz	4 GHz
Boost clock speed	2.67 GHz	4.2 GHz
L1 cache	64 KB (per core)	96 KB
L2 cache	256 KB (per core)	1024 KB
L3 cache	12 MB (shared)	no data
Chip lithography	32 nm	32 nm
Die size	239 mm2	246 mm2
Maximum core temperature	76 °C	70 °C
Maximum case temperature (TCase)	no data	70 °C
Number of transistors	1,170 million	1,303 million
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	-	+

Compatibility

Information on Xeon E5645 and A6-6420K 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	FM2
Power consumption (TDP)	80 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and A6-6420K. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
AES-NI	+	+
FMA	-	+
AVX	-	+
PowerNow	-	+
PowerGating	-	+
VirusProtect	-	+
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

Security technologies

Xeon E5645 and A6-6420K 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 A6-6420K are enumerated here.

AMD-V	-	+
VT-d	+	no data
VT-x	+	no data
EPT	+	no data
IOMMU 2.0	-	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and A6-6420K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3-1866
Maximum memory size	288 GB	no data
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	AMD Radeon HD 8470D
Number of pipelines	no data	192
Enduro	-	+
Switchable graphics	-	+
UVD	-	+

Graphics interfaces

Available interfaces and connections of Xeon E5645 and A6-6420K integrated GPUs.

DisplayPort	-	+
HDMI	-	+

Graphics API support

APIs supported by Xeon E5645 and A6-6420K integrated GPUs, sometimes API versions are included.

DirectX

no data

DirectX® 11

Peripherals

Specifications and connection of peripherals supported by Xeon E5645 and A6-6420K.

PCIe version

2.0

2.0

Synthetic benchmark performance

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

---

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.

---

Pros & cons summary

---

Performance score	3.18	0.99
Physical cores	6	2
Threads	12	2
Power consumption (TDP)	80 Watt	65 Watt

---

Should you still have questions on choice between Xeon E5645 and A6-6420K, 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.

---