Athlon II X4 645 vs i7-5820K

VS

Aggregate performance score

Core i7-5820K
2014
6 cores / 12 threads, 140 Watt
6.43
+320%

Core i7-5820K outperforms Athlon II X4 645 by a whopping 320% based on our aggregate benchmark results.

Primary details

Comparing Core i7-5820K and Athlon II X4 645 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking10702149
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation1.153.30
Market segmentDesktop processorDesktop processor
Power efficiency4.191.47
Architecture codenameHaswell-E (2014)Propus (2009−2011)
Release date1 September 2014 (10 years ago)21 September 2010 (14 years ago)
Launch price (MSRP)$410$80

Cost-effectiveness evaluation

Performance per price, higher is better.

Athlon II X4 645 has 187% better value for money than i7-5820K.

Detailed specifications

Core i7-5820K and Athlon II X4 645 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 cores6 (Hexa-Core)4 (Quad-Core)
Threads124
Base clock speed3.3 GHz3.1 GHz
Boost clock speed3.6 GHz3.1 GHz
Bus rate0 GT/sno data
L1 cache64 KB (per core)128 KB (per core)
L2 cache256 KB (per core)512 KB (per core)
L3 cache15 MB (shared)0 KB
Chip lithography22 nm45 nm
Die size356 mm2169 mm2
Maximum core temperature67 °Cno data
Number of transistors2,600 million300 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplier+-

Compatibility

Information on Core i7-5820K and Athlon II X4 645 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 configuration11
SocketFCLGA2011AM3
Power consumption (TDP)140 Watt95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-5820K and Athlon II X4 645. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.2, Intel® AVX2no data
AES-NI+-
AVX+-
Enhanced SpeedStep (EIST)+no data
Turbo Boost Technology2.0no data
Hyper-Threading Technology+no data
TSX+-
Idle States+no data
Thermal Monitoring+-
Smart Response+no data
Demand Based Switching-no data

Security technologies

Core i7-5820K and Athlon II X4 645 technologies aimed at improving security, for example, by protecting against hacks.

TXT+no data
EDB+no data
Identity Protection+-

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-5820K and Athlon II X4 645 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-5820K and Athlon II X4 645. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR4DDR3
Maximum memory size64 GBno data
Max memory channels4no data
Maximum memory bandwidth68 GB/sno data

Peripherals

Specifications and connection of peripherals supported by Core i7-5820K and Athlon II X4 645.

PCIe version3.02.0
PCI Express lanes28no data

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.

i7-5820K 6.43
+320%
Athlon II X4 645 1.53

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

i7-5820K 9843
+319%
Athlon II X4 645 2348

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

i7-5820K 1176
+269%
Athlon II X4 645 319

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

i7-5820K 5476
+470%
Athlon II X4 645 961

Gaming performance

Pros & cons summary


Performance score 6.43 1.53
Recency 1 September 2014 21 September 2010
Physical cores 6 4
Threads 12 4
Chip lithography 22 nm 45 nm
Power consumption (TDP) 140 Watt 95 Watt

i7-5820K has a 320.3% higher aggregate performance score, an age advantage of 3 years, 50% more physical cores and 200% more threads, and a 104.5% more advanced lithography process.

Athlon II X4 645, on the other hand, has 47.4% lower power consumption.

The Core i7-5820K is our recommended choice as it beats the Athlon II X4 645 in performance tests.


Should you still have questions on choice between Core i7-5820K and Athlon II X4 645, ask them in Comments section, and we shall answer.

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Intel Core i7-5820K
Core i7-5820K
AMD Athlon II X4 645
Athlon II X4 645

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Community ratings

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