Athlon X4 840

Details and Benchmarks for AMD Athlon X4 840

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Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Athlon X4 840 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,431 Rank: 1360
Rank Name Score Visual
1356 A10-9630P 4,432
+0%
1357 Xeon E5440 4,432
+0%
1358 Xeon E5-2650L v2 4,431
+0%
1359 Core i5-2390T 4,431
+0%
1360 Athlon X4 840 4,431
1361 Pentium 4415U 4,430
+-0%
1362 Phenom II X4 B55 4,428
-0.1%
1363 Core i3-2120T 4,427
-0.1%
1364 A10 PRO-7800B 4,426
-0.1%
1365 FX-8800P 4,424
-0.2%

View full ranking →

Multicore Score

Multicore performance score for Athlon X4 840 based on multi-threaded benchmark results.

4,435 Rank: 1372
Rank Name Score Visual
1368 Core i5-4200M 4,435
+0%
1369 Core i5-4350U 4,435
+0%
1370 Phenom II X4 805 4,435
+0%
1371 Core i5-L16G7 4,435
+0%
1372 Athlon X4 840 4,435
1373 Athlon PRO 3045B 4,434
+-0%
1374 Pentium G3260 4,433
+-0%
1375 A10-7850K 4,433
+-0%
1376 Core i7-4600U 4,433
+-0%
1377 Core i5-4300U 4,433
+-0%

View full ranking →

Singlecore Score

Single-core performance score for Athlon X4 840 based on single-threaded benchmark results.

4,429 Rank: 1361
Rank Name Score Visual
1357 Core i7-2670QM 4,431
+0%
1358 Xeon E3-1260L 4,431
+0%
1359 Core i5-2515E 4,429
+0%
1360 A9-9420 4,429
+0%
1361 Athlon X4 840 4,429
1362 FX-6120 4,427
+-0%
1363 Athlon II X4 631 4,427
+-0%
1364 Core i3-5010U 4,427
+-0%
1365 A10 PRO-7800B 4,427
+-0%
1366 Core i7-3540M 4,426
-0.1%

View full ranking →

Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Athlon X4 840 based on integer math, floating point math, and prime number computation benchmarks.

4,584 Rank: 1012
Rank Name Score Visual
1008 Athlon X4 860K 4,585
+0%
1009 Pentium Gold G5500 4,584
+0%
1010 Core i5-2405S 4,584
+0%
1011 Phenom II X6 1090T 4,584
+0%
1012 Athlon X4 840 4,584
1013 Core i7-2670QM 4,583
+-0%
1014 Core i3-7300 4,583
+-0%
1015 Core i5-2300 4,583
+-0%
1016 A10-6790K 4,583
+-0%
1017 Core i5-760 4,583
+-0%

View full ranking →

Data Processing

Aggregated score for Athlon X4 840 based on data encryption, data compression, and string sorting benchmarks.

4,543 Rank: 1089
Rank Name Score Visual
1085 A8-7670K 4,543
+0%
1086 Athlon II X4 555 4,543
+0%
1087 Phenom II X4 955 4,543
+0%
1088 Xeon X5460 4,543
+0%
1089 Athlon X4 840 4,543
1090 Pentium Gold G5420T 4,542
+-0%
1091 Core i5-7267U 4,542
+-0%
1092 Core i3-8145U 4,542
+-0%
1093 Core i3-4330 4,542
+-0%
1094 Phenom II X4 850 4,542
+-0%

View full ranking →

Physics & Compute

Aggregated score for Athlon X4 840 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,539 Rank: 1167
Rank Name Score Visual
1163 Core i5-4300U 4,539
+0%
1164 Core i5-5250U 4,539
+0%
1165 Xeon E3-1220L v2 4,539
+0%
1166 A10 PRO-7850B 4,539
+0%
1167 Athlon X4 840 4,539
1168 Core M3-7Y30 4,538
+-0%
1169 Core i5-7Y57 4,538
+-0%
1170 A10-6800K 4,538
+-0%
1171 Core i5-3340M 4,538
+-0%
1172 Core i5-3320M 4,538
+-0%

View full ranking →

Athlon X4 840 Details

The AMD Athlon X4 840 is designed for budget-conscious desktop users who need a capable quad-core processor without the overhead of integrated graphics. Launched in August 2014, this CPU is part of AMD's Kaveri architecture lineup and represents a mid-tier offering from that era, targeting mainstream consumers who prioritize value over cutting-edge performance. As of early 2026, it is a nearly decade-old processor, reflecting the rapid pace of advancement in consumer computing.

Built on a 28 nm process by GlobalFoundries, the Athlon X4 840 features four cores based on the Kaveri microarchitecture, operating at a base frequency of 3.1 GHz with a turbo boost up to 3.8 GHz. It supports dual-channel DDR3 memory up to 2133 MT/s and is compatible with Socket FM2+ motherboards. The chip has a 65 W TDP, making it suitable for standard cooling solutions, and includes a 4 MB L2 cache across all cores. It supports a range of instruction sets including AVX, SSE, and AES-NI, enabling efficient handling of multimedia, encryption, and general productivity tasks.

Despite its age, the Athlon X4 840 delivers respectable performance in single-threaded and lightly threaded workloads. It achieves a Singlecore Score of 4429, placing it at #1359 among 2060 processors, and a Multicore Score of 4435, ranking #1366. Its Overall Score of 4431 positions it at #1358, narrowly behind several contemporary Intel and AMD chips like the Core i5-8210Y and A10-7800. These results suggest it holds its own in basic computing, though it trails significantly behind modern processors in both raw power and efficiency.

Notably, the Athlon X4 840 lacks integrated graphics, requiring a discrete GPU for any visual output. This omission, combined with its relatively low memory bandwidth of 34.1 GB/s, limits its appeal for modern applications such as gaming or content creation. However, it remains a viable option for light office use, web browsing, and media playback in systems where a dedicated graphics card is already present. The unlocked multiplier also offers modest overclocking potential, appealing to hobbyists willing to push older hardware beyond stock performance.

In the broader landscape of CPU performance, the Athlon X4 840 falls far behind the top-tier processors of today. Even among its contemporaries, it sits just below high-end offerings like the A10-7850K and Core i7-4650U. While it remains a functional choice for entry-level or secondary systems, it is no longer competitive in performance-critical environments. For users seeking modern capabilities, upgrading to a newer platform is strongly recommended.
Frequently Compared

AMD Ryzen 5 3600 4 views

AMD Ryzen 5 3500X 4 views

AMD Ryzen Threadripper 2970WX 4 views

AMD Ryzen 3 PRO 2200GE 3 views

AMD Athlon PRO 3045B 3 views

Intel Xeon W3503 2 views

Intel Core 2 Duo E8600 2 views

Intel Core M 5Y10 2 views

Intel Xeon Silver 4208 1 view

Intel Xeon Silver 4116T 1 view

AMD Athlon X4 840

Main Specifications

Designer: AMD
Name: Athlon X4 840
Cores: 4
Threads: 4
Base Frequency: 3100 MHz
Clock Multiplier: 31x (unlocked)
Core Name: Kaveri
Socket: Socket FM2+
Package: µPGA
Target Segment: Desktop
TDP: 65 W

Cache Specifications

Memory Specifications

Supported Memory Type: DDR3

Physical Specifications

Process: 28 nm
Die Area: 245 mm²
Manufacturer: GlobalFoundries

CPU Features

MMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX ABM BMI1 FMA3 AES CLMUL F16C SSE4a FMA4 AMD-V 3DNow! TBM XOP
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