AMD Athlon X4 840: specs and benchmarks

Price now 30$
Games supported 80%
AMD Athlon X4 840
AMD Athlon X4 840
  • Interface
  • Core clock speed
  • Max video memory
  • Memory type
  • Memory clock speed
  • Maximum resolution
Year of release 2014
Performance 3.77
Processor Technical data and tests
AMD Athlon X4 840
AMD Athlon X4 840 AMD Athlon X4 840


AMD started AMD Athlon X4 840 sales on August 2014. This is Kaveri architecture desktop processor primarily aimed at office systems. It has 4 cores and 4 threads, and is based on 28 nm manufacturing technology, with a maximum frequency of 3800 MHz and a locked multiplier.

Compatibility-wise, this is Socket FM2+ processor with a TDP of 65 watt and a maximum temperature of °C.

It provides poor benchmark performance at


percent of a leader's which is AMD EPYC 7763.

General info

Of Athlon X4 840 processor market type (desktop or notebook), architecture, sales start time and pricing.

Place in performance rating1274
Value for money7.38
Market segmentDesktop processor
Series4x Athlon
Architecture codenameKaveri
Release dateAugust 2014 (7 years ago)
Price now$30 of 16595 (Xeon E7-4850)
Value for money

To get the index we compare the characteristics of the processors and their cost, taking into account the cost of other processors.

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Technical specs

Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.

Physical cores4 (Quad-Core)
Base clock speed3.1 GHzof 4.7 (FX-9590)
Boost clock speed3.8 GHzof 5.3 (Core i9-10900KF)
L2 cache4 MBof 12288 (Core 2 Quad Q9550)
Chip lithography28 nmof 5 (Apple M1)
64 bit support+


Information on Athlon X4 840 compatibility with other computer components and devices: 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.

SocketSocket FM2+
Thermal design power (TDP)65 wattof 400 (Xeon Platinum 9282)

Virtualization technologies

Supported virtual machine optimization technologies. Some are specific to Intel only, some to AMD.


Benchmark performance

Single-core and multi-core benchmark results of Athlon X4 840. Overall benchmark performance is measured in points in 0-100 range, higher is better.

Overall 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.

Athlon X4 840 3.77
  • 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.

Athlon X4 840 3305

Game benchmarks

Let's see how good Athlon X4 840 is for a gaming PC, compared with system requirements of some popular titles. Remember that sometimes official hardware requirements may reflect real performance inaccurately.

Medium Preset

Assassin's Creed Odyssey 98
Battlefield 5 169
Call of Duty: Modern Warfare 145
Far Cry New Dawn 116
Red Dead Redemption 2 117
Shadow of the Tomb Raider 136

High Preset

Assassin's Creed Odyssey 85
Battlefield 5 161
Call of Duty: Modern Warfare 126
Far Cry New Dawn 113
Horizon Zero Dawn 116
Metro Exodus 92
Red Dead Redemption 2 66
Shadow of the Tomb Raider 129
The Witcher 3: Wild Hunt 198

Ultra Preset

Assassin's Creed Odyssey 62
Battlefield 5 147
Far Cry New Dawn 100
The Witcher 3: Wild Hunt 103

High Preset

Call of Duty: Modern Warfare 84
Horizon Zero Dawn 80
Metro Exodus 55
Red Dead Redemption 2 43
Shadow of the Tomb Raider 86

Ultra Preset

Assassin's Creed Odyssey 57
Battlefield 5 121
Far Cry New Dawn 90

High Preset

Call of Duty: Modern Warfare 48
Horizon Zero Dawn 45
Metro Exodus 35
Red Dead Redemption 2 28
Shadow of the Tomb Raider 46
The Witcher 3: Wild Hunt 76

Ultra Preset

Assassin's Creed Odyssey 38
Battlefield 5 72
Far Cry New Dawn 55

Relative perfomance

Overall Athlon X4 840 performance compared to nearest competitors among desktop CPUs.

Intel equivalent

We believe that the nearest equivalent to Athlon X4 840 from Intel is Core i7-975, which is nearly equal in speed and higher by 1 position in our rating.

Intel Core i7-975 Core i7 975

Here are some closest Intel rivals to Athlon X4 840:

Similar processors

Here is our recommendation of several processors that are more or less close in performance to the one reviewed.

Intel Core i3-4350 Core i3 4350
AMD FX-4150 FX 4150
AMD A8-9600 A8 9600
Intel Core i3-4150 Core i3 4150
Intel Core i3-4130 Core i3 4130
AMD FX-4350 FX 4350

User rating

Here is the rating given to the reviewed processor by our users. Let others know your opinion by rating it yourself.

Advices and comments

Here you can ask a question about Athlon X4 840, agree or disagree with our judgements, or report an error or mismatch.