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AMD Athlon-II X4-645 CPU ADX645WFGMBOX E-mail
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Written by Hank Tolman   
Tuesday, 21 September 2010
Table of Contents: Page Index
Features and Specifications
Closer Look: Athlon-II X4-640
Testing and Results
EVEREST Benchmark Tests
Passmark PerformanceTest
PCMark Vantage Benchmark Tests
SiSoftware Sandra
Cinebench R11.5 Benchmarks
Video Game Benchmarks
AMD Athlon-II X4 Final Thoughts
ADX645WFGMBOX Conclusion

Athlon-II X4 AM3 Features

AMD Direct Connect Architecture

An award-winning technology designed to reduce bottlenecks that can exist when multiple components compete for access to the processor bus. Competing x86 systems use a single front-side bus (FSB) which must carry memory access, graphics, and I/O traffic. Eliminate the FSB, and you can reduce delays that competing access requests can cause.

45 nm Process Technology with Immersion Lithography

More efficient process technology with cutting-edge lithographic performance puts more transistors in less space.

AMD Wide Floating Point Accelerator

Doubles processor bandwidth from 64- to a full 128-Bit Floating-Point math processing pipeline that can double many of the bandwidth paths that help keep it full.

AMD Digital Media XPress 2.0 Technology

Provides support for SSE, SSE2, SSE3, SSE4a, and MMX instructions for digital media applications and security.

CPU Architectural Features

True Multi-Core Processing

The extensive AMD64 architectural optimizations and features enable thorough integration of multiple cores within the same processor, with each core having its own L1 and L2 caches.

AMD Dedicated Multi-Cache

Each core has its own dedicated L2 cache, which enables simultaneous independent core access to L2 cache, eliminating the need for cores to arbitrate for cache access. This helps reduce latency on L2 cache accesses.

AMD Virtualization (AMD-V) Technology

Silicon feature-set enhancements designed to improve the performance, reliability, and security of both existing and future virtualization environments.

AMD PowerNow! 3.0 Technology

The latest power management technologies that deliver performance on demand when you need it, and power savings when you don't.

HyperTransport 3.0 Technology

Third-generation HyperTransportTM interface improves performance, supporting transfer speeds up to 4.4GT/s.

Simultaneous 32-bit and 64-bit Computing

AMD64 technology enables a breakthrough approach to 64-bit computing that doubles the number of registers in the processor and allows PC users to use today's 32-bit software applications while enabling them to also use the next generation of 64-bit applications.

Cool'n'Quiet 3.0 Technology

Up to eight different performance states help enhance power efficiency. Simplified performance state transitions can reduce latency and the software overhead of performance state changes.

AMD Dynamic Power Management

Each processor core, and the integrated memory controller and HyperTransportTM controller, is powered by dedicated voltage planes.

Integrated Dual-Channel Memory Controller

Directly connects the processor to memory for optimum performance, low latency, and high throughput.

Multi-Point Thermal Control

The next-generation design features multiple on-die thermal sensors with digital interface. Automatic reduction of p-state when temperature exceeds pre-defined limit. Additional memory thermal management interface. AMD_Logo_250px.png

AMD CoolCore Technology

Coarse and fine transistor control that can automatically reduce processor energy consumption by turning off unused parts of the processor.

ADX645WFGMBOX Specifications

  • Model Number & Core Frequency: X4-645 @ 3.1GHz
  • L1 Cache Sizes: 64K of L1 instruction and 64K of L1 data cache per core (384KB total L1 per processor)
  • L2 Cache Sizes: 512KB of L2 data cache per core (1.5MB total L2 per processor)
  • Memory Controller Type: Integrated 128-bit wide memory controller *
  • Memory Controller Speed: 2.0GHz with Dual Dynamic Power Management
  • Types of Memory Supported: Support for unregistered DIMMs up to PC2-8500 (DDR2-1066MHz) -AND- PC3-10600 (DDR3-1333MHz)
  • HyperTransport 3.0 Specification: One 16-bit/16-bit link @ up to 4.0GHz full duplex (2.0GHz x2)
  • Total Processor-to-System Bandwidth: Up to 37.3 GB/s bandwidth [Up to 21.3 GB/s total bandwidth (DDR3-1333) + 16.0GB/s (HT3)]
  • Packaging: Socket AM3 938-pin organic micro pin grid array (micro-PGA)
  • Fab location: GLOBALFOUNDRIES Fab 1 Module 1
  • Process Technology: 45-nanometer DSL SOI (silicon-on-insulator) technology
  • Approximate Die Size: 169 mm2
  • Approximate Transistor count: ~ 300 million
  • Max Temp: 71 Celsius
  • Core Voltage: 1.05-1.4V
  • Max TDP: 95 Watts
  • AMD Codename: "Propus"
  • MSRP: $122

    *Note: configurable for dual 64-bit channels for simultaneous read/writes



# You can wait 3 months...BernardP 2010-09-21 04:37
... and the 945 will drop to 99$ when the 3.2 Ghz Athlon II X4 950 is released. But 3 months from now, Sandy Bridge will be almost amongst us, pushing down the price of all AMD processors.
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# Thanks for the in depthCharlee 2010-10-16 06:23
After reading your in depth review on this processor, makes me feel that I've made the right choice. I placed in an order at for my very much needed rig and was going for the X4 640 when they ( sent me a "shellshocker" (newsletter with offers) and noticed the x4 645...for $120, needless to say, I was not willing to go over $100 on my budget for a CPU, I finally came to the conclusion that I was getting the Athlon II X4 645 for only $108!! I what da hell why not 3.0 Ghz vs. 3.1 Ghz and a little extra (AMD-V) , that the 640 doesn't seem to have in the specs, i figured...why not? So, right now...? I'm anxious to setup my new rig with the AMD Athlon II X4 645!!
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# Just out of Curosity...ADI 2011-01-30 01:00
Great article i must say... n thanks to mr. tolman. But sir there is a question which i have i dunno how correct i am in asking this but which one is better Athlon X4 645 or Phenom II X4 955 BE. X4 645 is prices at around $110 and X4 955 BE at around $150 but i was just comparing the scores of few benchmarks from different articles on benchmark reviews and found both the processor's performance is almost the same or sometimes X4 645 beating the X4 955 BE... I dunno if anyone has noticed this earlier or my observation is wrong.

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