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Monday, 03 January 2011
Table of Contents: Page Index
AMD Phenom-II X4-840 CPU HDX840WFGMBOX
Features and Specifications
Closer Look: Phenom-II X4-840
Testing and Results
AIDA64 Extreme Edition v1.1 Benchmark Tests
Passmark PerformanceTest
PCMark Vantage Benchmark Tests
SiSoftware Sandra
Cinebench R11.5 Benchmarks
Street Fighter IV Benchmark
Video Transcoding Tests
AMD Phenom-II X4-840 Final Thoughts
AMD Phenom-II X4-840 Conclusion

Phenom-II X4-840 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.

HDX840WFGMBOX Specifications

  • Model Number & Core Frequency: X4-840 @ 3.2GHz
  • TRAY OPN# HDX840WFGMBOX
  • PIB OPN# HDX840WFGMBOXBOX
  • 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: $102

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



 

Comments 

 
# You tell it like it isBernardP 2011-01-04 06:09
Congrats for telling it like it is. I have read another review that glosses over the renaming trickery.

However... the Phenom II 840 is not "a wolf in sheep's clothing", as you say, but more of a sheep in wolf's clothing :-)

It should be called a Athlon II 650, without a doubt. This renaming brings shame to AMD.

No doubt we will see the likes of HP and Acer peddling this Phalse Phenom to the gullible masses.
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# Marketing at it's finestComputer Ed 2011-01-04 07:52
That in the end was the reason for it. My sources at AMD hinted that the name change was asked for by the partners. However as I understand it the 800 series will be the replacement as it where for the Athlon II line.

On a different note I am curious how many people complained when the the i5 was moved from the quad core as it originally released to a dual? Did anyone cry foul then?
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# I agreeHank 2011-01-04 12:10
I mentioned in my review of the i5-2500K that I was glad for the newer transparency with the Sandy Bridge CPUs where all i5 chips are quad-core with no hyperthreading. It's disappointing that they don't have hyperthreading, but at least we know what to expect when buying an i5 this time.
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# What about the "real" Phenom II?Olle P 2011-01-14 06:37
I think the most intriguing result of this test is how little extra performance is gained by adding 6MB L3 cache and hiking up the clock speed from 3.2 to 3.6 GHz (the specs of the 975).

The difference in actual results is mostly way below the 12.5% expected by the clock speed alone.

Seems like the only reason for spending the extra money on a "real" Phenom II X4 is to get a Black Edition with better overclocking.
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# replyNormal 2011-01-20 14:17
@Olle P

Do not forget the L3 cache is suited for memory intensive tasking.
So just a clockspeed application a faster Athlon will beat a lower clocked Phenom,but whenever memory (Cache) comes in play a slower Phenom will beat an even higher clocked Athlon handsdown.
That's why in certain games the smaller P2X2 560 will beat the Athlon 2X4 645 .
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# MrDavid Richmond 2011-05-20 10:24
I built a new pc around a 840 cpu.I was going to use a i3 clarkdale originally but when I went to buy the supplyer only had the new sandybridge as I was on a tight budget I took the amd route instead.A great choice fsst at most tasks and cheap.
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