Xeon E3-1281 v3 vs i7-5820K

Primary details

Comparing Core i7-5820K and Xeon E3-1281 v3 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1074	1267
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.07	no data
Market segment	Desktop processor	Server
Power efficiency	4.19	5.42
Architecture codename	Haswell-E (2014)	no data
Release date	1 September 2014 (10 years ago)	1 April 2014 (10 years ago)
Launch price (MSRP)	$410	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-5820K and Xeon E3-1281 v3 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)	4 (Quad-Core)
Threads	12	8
Base clock speed	3.3 GHz	3.7 GHz
Boost clock speed	3.6 GHz	4.1 GHz
Bus rate	0 GT/s	5 GT/s
L1 cache	64 KB (per core)	no data
L2 cache	256 KB (per core)	no data
L3 cache	15 MB (shared)	8 MB Intel® Smart Cache
Chip lithography	22 nm	22 nm
Die size	356 mm2	no data
Maximum core temperature	67 °C	no data
Number of transistors	2,600 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on Core i7-5820K and Xeon E3-1281 v3 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	1	1
Socket	FCLGA2011	FCLGA1150
Power consumption (TDP)	140 Watt	82 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-5820K and Xeon E3-1281 v3. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2, Intel® AVX2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	-
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	+	+
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	no data	+
SIPP	-	+
Smart Response	+	no data
Demand Based Switching	-	no data
Fast Memory Access	no data	+

Security technologies

Core i7-5820K and Xeon E3-1281 v3 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	no data	+
Identity Protection	+	+
OS Guard	no data	+
Anti-Theft	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-5820K and Xeon E3-1281 v3 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-5820K and Xeon E3-1281 v3. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR3L-1333, DDR3L-1600
Maximum memory size	64 GB	32 GB
Max memory channels	4	2
Maximum memory bandwidth	68 GB/s	25.6 GB/s
ECC memory support	-	+

Peripherals

Specifications and connection of peripherals supported by Core i7-5820K and Xeon E3-1281 v3.

PCIe version	3.0	3.0
PCI Express lanes	28	16

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	6.22	4.72
Recency	1 September 2014	1 April 2014
Physical cores	6	4
Threads	12	8
Power consumption (TDP)	140 Watt	82 Watt

---

Should you still have questions on choice between Core i7-5820K and Xeon E3-1281 v3, 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.

---