Athlon X4 840
AMD
PassMark
3,331
MSRP
$102
AVG Price
$25
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Overview
The Athlon X4 840 is manufactured by AMD. It was released in 2009-01-01. It is based on the Kaveri (2014−2015) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.8 GHz. L2 cache: 4 MB. Built on 28 nm process technology. Socket: FM2+. Thermal design power (TDP): 65 watt. Memory support: DDR3. Passmark benchmark score: 3,331 points. Launch price was $149.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. The Athlon X4 840 is positioned at rank #563 in our cost-efficiency ranking, representing a Lower cost-benefit for your build. Components placed above yours deliver better value for money.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Athlon X4 840
FPS Benchmarks
Predicted performance for Athlon X4 840 across popular games. Tested paired with RTX 4090 to isolate CPU performance.
Path of Exile 2
Counter-Strike 2
League of Legends
Valorant
Technical Analysis
Detailed breakdown of Athlon X4 840 specifications and capabilities.
Processing Power
The Athlon X4 840 is a 4-core / 4-thread processor based on the Kaveri (2014−2015) architecture, manufactured on a 28 nm process node. It reaches a maximum boost clock of 3.8 GHz from a base frequency of 3.1 GHz— higher boost clocks directly translate to better single-threaded performance and responsiveness in gaming. In the PassMark benchmark (a comprehensive multi-threaded test), it scores 3,331, placing it in the Entry Level performance tier as a Legacy generation product.
| Specification | Athlon X4 840 |
|---|---|
| Cores / ThreadsPhysical/logical processing units | 4C / 4T |
| Max Boost ClockPeak single-core speed under boost | 3.8 GHz |
| Base ClockGuaranteed minimum operating frequency | 3.1 GHz |
| ArchitectureCPU microarchitecture design | Kaveri (2014−2015) |
| Process NodeFabrication technology — smaller = more efficient | 28 nm |
| L2 CachePer-core fast cache for frequently accessed data | 4 MB |
| L1 CacheUltra-fast per-core cache | 256K |
| Die SizePhysical silicon area of the processor | 245 mm2 |
| Transistor CountMore transistors = more capabilities | 2,411 million |
| 64-bit Support | Yes |
| Windows 11 Compatible | No |
| Unlocked MultiplierWhether the CPU can be overclocked | Yes (Overclockable) |
| PassMark ScoreOverall multi-threaded benchmark score | 3,331 |
Memory & Platform
The Athlon X4 840 fits into the FM2+ socket and supports PCIe 3.0 with 16 total PCIe lanes for expansion cards and storage. It supports DDR3 memory at speeds up to DDR3-2133 (faster RAM improves bandwidth-sensitive workloads), with a maximum capacity of 64 GB across 2 channels (dual-channel doubles bandwidth).
| Specification | Athlon X4 840 |
|---|---|
| TypeDesktop or Laptop processor | desktop |
| SeriesProduct family | 4x Athlon |
| SocketMotherboard socket required | FM2+ |
| PCIe GenerationPeripheral interconnect speed — affects GPU and SSD bandwidth | PCIe 3.0 |
| PCIe LanesTotal available lanes for GPUs, NVMe drives, and expansion | 16 |
| RAM TypeSupported memory standard | DDR3 |
| Max RAM SpeedMaximum officially supported memory frequency | DDR3-2133 |
| Max RAM CapacityMaximum installable memory | 64 GB |
| RAM ChannelsDual-channel doubles bandwidth vs single-channel | 2 |
| ECC SupportError-Correcting Code memory — prevents data corruption | No |
| Integrated GPUBuilt-in graphics processor | No |
| Compatible ChipsetsMotherboard chipsets that support this CPU | AMD FM2+ |
| Max CPUs in ConfigMulti-socket support for servers | 1 |
Power & Cooling
The Athlon X4 840 has a rated TDP (Thermal Design Power) of 65 watt — this indicates the amount of heat generated under sustained load and determines what cooling solution is needed.
| Specification | Athlon X4 840 |
|---|---|
| TDPThermal Design Power — heat output under sustained workload | 65 watt |
Value Analysis
At an average price of $25 (MSRP: $102), the Athlon X4 840 delivers 133 PassMark points per dollar. It currently holds Rank #563 in the overall cost-benefit ranking — this ranking factors in performance-per-dollar relative to all available processors. Performance ranking position: #2154 out of all indexed processors.
| Specification | Athlon X4 840 |
|---|---|
| MSRPManufacturer's Suggested Retail Price | $102 |
| Avg Price (30d)Average market price over the last 30 days | $25 |
| Launch PriceOriginal retail price at launch | $149 |
| Cost-Benefit RankPosition in overall value ranking | #563 |
| Performance RankPosition in overall performance ranking | #2154 |
| Release DateLaunch date | 2009-01-01 |
| Release Year | 2014 |
| DesignerArchitecture designer (e.g. Intel, AMD) | AMD |
| ManufacturerFabrication foundry (e.g. TSMC) | GlobalFoundries |
Similar Performance
Processors with benchmark scores closest to the current hardware, grouped by manufacturer.
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Our Recommendation for Athlon X4 840
Suggested pairings based on performance balance
Minimum (Avoid Bottleneck) (12)
Recommended (Balanced) (12)
High-End (Max Performance) (12)
Popular Comparisons
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