Core i7-3970X vs Core i7-5820K

General info

Comparing Core i7-5820K and Core i7-3970X processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	965	1058
Place by popularity	not in top-100	not in top-100
Value for money	3.17	1.57
Market segment	Desktop processor	Desktop processor
Architecture codename	Haswell-E (2014)	Sandy Bridge-E (2011−2013)
Release date	1 September 2014 (9 years old)	1 November 2012 (11 years old)
Launch price (MSRP)	$410	$593
Current price	$181 (0.4x MSRP)	$264 (0.4x MSRP)

i7-5820K has 102% better value for money than i7-3970X.

Technical specs

Core i7-5820K and Core i7-3970X 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)	6 (Hexa-Core)
Threads	12	12
Base clock speed	3.3 GHz	3.5 GHz
Boost clock speed	3.6 GHz	4 GHz
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	256 KB (per core)
L3 cache	15 MB (shared)	15 MB (shared)
Chip lithography	22 nm	32 nm
Die size	356 mm2	435 mm2
Maximum core temperature	67 °C	67 °C
Maximum case temperature (TCase)	no data	70 °C
Number of transistors	2,600 million	2,270 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	Yes	Yes

Compatibility

Information on Core i7-5820K and Core i7-3970X 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	FCLGA2011
Power consumption (TDP)	140 Watt	150 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-5820K and Core i7-3970X. You'll probably need this information if you require some particular technology.

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

Security technologies

Core i7-5820K and Core i7-3970X technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+
Identity Protection	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-5820K and Core i7-3970X are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-5820K and Core i7-3970X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR3
Maximum memory size	64 GB	64.45 GB
Max memory channels	4	4
Maximum memory bandwidth	68 GB/s	51.2 GB/s
ECC memory support	-	-

Peripherals

Specifications and connection of peripherals supported by Core i7-5820K and Core i7-3970X.

PCIe version	3.0	2.0
PCI Express lanes	28	40

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.

Core i7-5820K outperforms Core i7-3970X by 17% based on our aggregated benchmark results.

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Advantages and disadvantages

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Performance score	6.44	5.52
Recency	1 September 2014	1 November 2012
Cost	$410	$593
Chip lithography	22 nm	32 nm
Power consumption (TDP)	140 Watt	150 Watt

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Should you still have questions on choice between Core i7-5820K and Core i7-3970X, ask them in Comments section, and we shall answer.

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