Athlon II X4 645
AMD
PassMark
2,375
MSRP
$126
AVG Price
$20
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 II X4 645 is manufactured by AMD. It was released in 21 September 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,375 points. Launch price was $80.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. The Athlon II X4 645 is positioned at rank #819 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 II X4 645
Technical Analysis
Detailed breakdown of Athlon II X4 645 specifications and capabilities.
Processing Power
The Athlon II X4 645 is a 4-core / 4-thread processor based on the Propus (2009−2011) architecture, manufactured on a 45 nm process node. It reaches a maximum boost clock of 3.1 GHz from a base frequency of 3.1 GHz— higher boost clocks directly translate to better single-threaded performance and responsiveness in gaming. It carries 0 kB of L3 cache, plus 512 kB (per core) of L2 cache and 128 kB (per core) of L1 cache per core. In the PassMark benchmark (a comprehensive multi-threaded test), it scores 2,375, placing it in the Entry Level performance tier as a Legacy generation product. Geekbench 6 single-core (the most relevant metric for gaming FPS) records 399, while multi-core reaches 1,374. Cinebench R23 multi-core (measuring sustained rendering workload performance) scores 1,374.
| Specification | Athlon II X4 645 |
|---|---|
| Cores / ThreadsPhysical/logical processing units | 4C / 4T |
| Max Boost ClockPeak single-core speed under boost | 3.1 GHz |
| Base ClockGuaranteed minimum operating frequency | 3.1 GHz |
| ArchitectureCPU microarchitecture design | Propus (2009−2011) |
| Process NodeFabrication technology — smaller = more efficient | 45 nm |
| L3 CacheShared cache — reduces memory latency for all cores | 0 kB |
| L2 CachePer-core fast cache for frequently accessed data | 512 kB (per core) |
| L1 CacheUltra-fast per-core cache | 128 kB (per core) |
| Die SizePhysical silicon area of the processor | 169 mm2 |
| Transistor CountMore transistors = more capabilities | 300 million |
| 64-bit Support | Yes |
| Windows 11 Compatible | No |
| PassMark ScoreOverall multi-threaded benchmark score | 2,375 |
| Cinebench R23 MultiSustained multi-core rendering performance | 1,374 |
| Geekbench 6 SingleSingle-core performance — most relevant for gaming | 399 |
| Geekbench 6 MultiMulti-core parallel workload performance | 1,374 |
Memory & Platform
The Athlon II X4 645 fits into the AM3 socket and supports PCIe 2.0 with 16 total PCIe lanes for expansion cards and storage. It supports DDR3 memory at speeds up to DDR3-1333 (faster RAM improves bandwidth-sensitive workloads), with a maximum capacity of 16 GB across 2 channels (dual-channel doubles bandwidth).
| Specification | Athlon II X4 645 |
|---|---|
| TypeDesktop or Laptop processor | desktop |
| SocketMotherboard socket required | AM3 |
| PCIe GenerationPeripheral interconnect speed — affects GPU and SSD bandwidth | PCIe 2.0 |
| PCIe LanesTotal available lanes for GPUs, NVMe drives, and expansion | 16 |
| RAM TypeSupported memory standard | DDR3 |
| Max RAM SpeedMaximum officially supported memory frequency | DDR3-1333 |
| Max RAM CapacityMaximum installable memory | 16 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 700 Series,AMD 800 Series,AMD 900 Series |
| Max CPUs in ConfigMulti-socket support for servers | 1 |
Advanced Features
The Athlon II X4 645 is primarily designed for Desktop. Virtualization: Yes — enables running virtual machines efficiently (important for development and server workloads).
| Specification | Athlon II X4 645 |
|---|---|
| Primary Use CaseIntended workload category | Desktop |
| AVX-512Advanced vector instructions for AI/ML workloads | ❌ Not Supported |
| VirtualizationHardware-assisted virtualization technology | Yes |
Power & Cooling
The Athlon II X4 645 has a rated TDP (Thermal Design Power) of 95 Watt — this indicates the amount of heat generated under sustained load and determines what cooling solution is needed. It ships with the Yes stock cooler. Recommended cooling: false.
| Specification | Athlon II X4 645 |
|---|---|
| TDPThermal Design Power — heat output under sustained workload | 95 Watt |
| Included CoolerStock cooler bundled in the box | Yes |
| Recommended CoolerSuggested aftermarket cooling solution | false |
Value Analysis
At an average price of $20 (MSRP: $126), the Athlon II X4 645 delivers 119 PassMark points per dollar. It currently holds Rank #819 in the overall cost-benefit ranking — this ranking factors in performance-per-dollar relative to all available processors. Performance ranking position: #2433 out of all indexed processors.
| Specification | Athlon II X4 645 |
|---|---|
| MSRPManufacturer's Suggested Retail Price | $126 |
| Avg Price (30d)Average market price over the last 30 days | $20 |
| Launch PriceOriginal retail price at launch | $80 |
| Cost-Benefit RankPosition in overall value ranking | #819 |
| Performance RankPosition in overall performance ranking | #2433 |
| Release DateLaunch date | 21 September 2010 (15 years ago) |
| Release Year | 2010 |
| DesignerArchitecture designer (e.g. Intel, AMD) | AMD |
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Our Recommendation for Athlon II X4 645
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