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AMD Phenom II X4 840 - HDX840WFK42GM / HDX840WFGMBOX

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AMD Phenom II X4 840 specifications

General information
TypeCPU / Microprocessor
Market segmentDesktop
FamilyAMD Phenom II X4
Model number  ? 840
CPU part numbers
  • HDX840WFK42GM is an OEM/tray microprocessor
  • HDX840WFGMBOX is a boxed microprocessor
Stepping codesAADIC AD   NADIC AD
Frequency  ? 3200 MHz
Bus speed  ? 667 MHz Memory controller
One 2000 MHz 16-bit HyperTransport link
Clock multiplier  ? 16
Package938-pin organic micro-PGA
SocketsSocket AM2+
Socket AM3
Weight1.4oz / 39.2g (CPU)
12.5oz / 353.6g (box)
Introduction dateJan 4, 2011
Architecture / Microarchitecture
Processor core  ? Propus
Core stepping  ? BL-C3
Manufacturing process0.045 micron SOI
Die size258mm2
Data width64 bit
The number of cores4
The number of threads4
Floating Point UnitIntegrated
Level 1 cache size  ? 4 x 64 KB 2-way associative instruction caches
4 x 64 KB 2-way associative data caches
Level 2 cache size  ? 4 x 512 KB 16-way associative caches
Level 3 cache sizeNone
Virtual memory256 TB
  • MMX instructions
  • 3DNow! technology
  • SSE / Streaming SIMD Extensions
  • SSE2 / Streaming SIMD Extensions 2
  • SSE3 / Streaming SIMD Extensions 3
  • SSE4a  ? 
  • ABM / Advanced Bit Manipulation  ? 
  • AMD64 / AMD 64-bit technology  ? 
  • AMD-V / AMD Virtualization technology
  • EVP / Enhanced Virus Protection  ? 
Low power features
  • Cool'n'Quiet 3.0
  • CoolCore Technology  ? 
  • Dual Dynamic Power Management  ? 
  • Core C1 and C1E states
  • Package S0, S1, S3, S4 and S5 states
Integrated peripherals / components
Integrated graphicsNone
Memory controller
  • The number of controllers: 1
    Memory channels: 2
    Channel width (bits): 72
    Supported memory: DDR2-1066, DDR3-1333
    DIMMs per channel: up to 2
    Maximum memory bandwidth (GB/s): 21.3
Other peripheralsHyperTransport 3 technology
Electrical / Thermal parameters
V core  ? 0.85V - 1.4V
Maximum operating temperature  ? 71°C
Thermal Design Power  ? 95 Watt

Detailed side-by-side comparison

For detailed comparision of the AMD Phenom II X4 840 and any other other chip from our CPU database type in a chip name and/or its partial specs:

You can specify any of the following: manufacturer name, family name, model number, part number, core name, socket name, operating frequency, bus speed, and the last level cache. Here are examples of searches: HDX840WFK42GM, AMD Phenom II X4 3.2GHz, Propus Socket AM2+, Socket AM3

Historical price chart

The chart below shows official prices of AMD Phenom II X4 810, 840, 920 and 925 processors:

Historical official prices of Phenom II X4 810, 840, 920 and 925 processors


Q: Can I upgrade my Phenom II X4 840 processor?
A: Probably yes. CPU compatibility is determined by your motherboard. Please see resource for CPU support list for your board.

Phenom II X4 840 Overclocking

Sorry, overclocking information is not available at this time.

Related news stories

AMD cuts prices of Phenom II and FX CPUs
Feb 28, 2012: As you may know, AMD yesterday launched two FX microprocessors, including company's first production CPU, operating faster than 4 GHz. New product releases are usually accompanied by price drops of older models, and it wasn't an exception this time. AMD cut prices on two FX-Series models, and reduced prices for most of Phenom IIs. They also added pricing for A-Series A6-3620 and A8-3820 Accelerated Processing units (APUs).

AMD drops prices on Phenom II models
Feb 01, 2011: At the beginning of January, AMD announced three Phenom II microprocessors, quad-core X4 840 and 975 Black Edition, and hexa-core 1065T. Although the launch of these models was extensively covered by hardware news sites, and accompanied by large number of published reviews of new Phenom IIs, none of the processors appeared in the retail up to this moment. Today, these Phenom II models were added to AMD price list. At the same time, AMD dropped prices by %2 - 13% on a number of Phenom II chips.

AMD Phenom II X4 840 and 975: two weeks later
Jan 17, 2011: On January 4th at CES show in Las Vegas AMD announced three new desktop microprocessors - quad-core Phenom II X4 840 and 975, and hexa-core 1065T. Quite a few hardware review sites posted reviews of two quad-core Phenom IIs. Two weeks later, boxed versions of Phenom II models are not yet available anywhere in the US.

Compare AMD Phenom II X4 840 benchmark results with all tested CPUs from one of the following families:

To compare this Phenom II X4 CPU with any tested processor please proceed to

For additional benchmarks, comparing multi-threaded performance of this microprocessor with other Phenom II X4 CPUs and the fastest AMD and Intel x86 chips, please visit AMD Phenom II X4 840 benchmarks page.

AMD Phenom II X4 840 Benchmarks

The graphs below show up to 10 microprocessors with approximately the same level of integer (CPU), floating-point (FPU), SIMD and memory performance. All processors were not overclocked, and were tested at a nominal frequency, with a stock heatsink and default BIOS settings. Click on the '?' mark next to each model name to see specifications of that model, and details of the test platform. To find out how the Phenom II X4 840 compares to other CPUs in specific benchmarks or in aggregate milti-threading performance please see benchmark tools section on the right.

Benchmarked processor

CPU ID:100F53
CPU vendor string:AuthenticAMD
CPU name string:AMD Phenom(tm) II X4 840 Processor

Integer performance

Part number   Result
AMD FX-6300  ? 
AMD Phenom II X4 955 (125W, rev. C2, BE)  ? 
AMD Phenom II X4 955 (125W, rev. C2)  ? 
AMD Phenom II X4 B97  ? 
AMD Phenom II X4 955 (125W, rev. C3, BE)  ? 
AMD Phenom II X4 840  ? 
Intel Core i5-2500T  ? 
AMD FX-6100  ? 
AMD Athlon II X4 651  ? 
AMD Athlon II X4 651K  ? 
AMD Athlon II X4 645  ? 

Floating Point performance

Part number   Result
Intel Core i5-2310  ? 
AMD Phenom II X4 955 (125W, rev. C3, BE)  ? 
AMD Phenom II X4 955 (125W, rev. C2)  ? 
AMD Phenom II X4 955 (125W, rev. C2, BE)  ? 
Intel Core i5-4440S  ? 
AMD Phenom II X4 840  ? 
AMD Phenom II X4 B97  ? 
AMD FX-8140  ? 
Intel Core i5-2300  ? 
AMD Athlon II X4 645  ? 
AMD FX-8120 (95W)  ? 

MMX / SSE / SSE2 performance

Part number   Result
AMD Phenom II X4 955 (125W, rev. C2, BE)  ? 
AMD Phenom II X4 B97  ? 
Intel Core i5-750  ? 
AMD A10-6800B  ? 
AMD A10-6800K  ? 
AMD Phenom II X4 840  ? 
Intel Core i5-3210M (PGA)  ? 
AMD FX-4350  ? 
Intel Core i5-2520M (PGA)  ? 
AMD A10-6790K  ? 
Intel Core i5-650  ? 

Memory-intensive program performance

Part number   Result
Intel Core i5-430M (PGA988)  ? 
AMD Phenom II XLT Q54L  ? 
Intel Core i5-420M (PGA988)  ? 
AMD A6-6420K  ? 
AMD Phenom II X2 521  ? 
AMD Phenom II X4 840  ? 
AMD A6-6400K  ? 
AMD Athlon II X4 645  ? 
AMD Athlon II X3 460  ? 
AMD A6-3620  ? 
AMD Athlon II X4 640 (rev. E0)  ? 

CPU ID information for the Phenom II X4 840

Our CPUID database contains 10 records for this microprocessor. See all submitted records.

Use our CPU identification tool to check features of your CPU.

NOTE: The CPU ID information below was taken from one CPU and may include features that are not present in all different steppings of the AMD Phenom II X4 840 CPU.

CPU Family:Phenom II X4
Model Number:840
Frequency:3214 MHz
Part number:
Stepping Code:
Submitted by:
General information
Processor name (BIOS):AMD Phenom(tm) II X4 840 Processor
Logical processors:4
Processor type:Original OEM Processor
Core stepping:BL-C3
CPUID signature:100F53
Family:16 (010h)
Model: 5 (05h)
Stepping: 3 (03h)

Cache: L1 data L1 instruction L2
Size: 4 x 64 KB 4 x 64 KB 4 x 512 KB
Associativity: 2-way set
2-way set
16-way set
Line size: 64 bytes 64 bytes 64 bytes
Lines per tag: 1 1 1
Instruction set extensionsAdditional instructions
MMX Advanced Bit manipulation
AMD extensions to MMX CLFLUSH
Extensions to 3DNow! CMPXCHG16B
  SKINIT/STGI support
Major featuresOther features
On-chip Floating Point Unit 1 GB large page support
64-bit / Intel 64 100MHz multiplier control
NX bit/XD-bit 128-bit SSE instructions
Secure Virtual Machine (Virtualization) 36-bit page-size extensions
PowerNow! / Cool'n'Quiet Advanced programmable interrupt controller
  Core multi-processing legacy mode
  Debugging extensions
  Extended APIC space
  FXSAVE/FXRSTOR optimizations
  Hardware P-state control
  Hardware thermal control
  Instruction based sampling
  LAHF/SAHF support in 64-bit mode
  LBR virtualization
  LOCK MOV CR0 means MOV CR8
  Machine check architecture
  Machine check exception
  Memory-type range registers
  Misaligned SSE mode
  Model-specific registers
  Nested page tables
  OS visible workaround
  Page attribute table
  Page global extension
  Page-size extensions (4MB pages)
  Physical address extensions
  SVM lock
  Software thermal control
  Support for NRIP save
  TSC rate is ensured to be invariant across all states
  Temperature sensor
  Time stamp counter
  Virtual 8086-mode enhancements
  Watchdog timer support

CPUs, related to AMD Phenom II X4 840

Model Cores /
Frequency Turbo
TDP Features Price  
AMD Phenom II X4 family, Socket AM2+ / Socket AM3
   Phenom II X4 8404 / 43.2 GHz 2 MB 95W  
   Phenom II X4 955 (125W, rev. C3)4 / 43.2 GHz 2 MB6 MB125W >
   Phenom II X4 955 (95W, rev. C3, non-BE)4 / 43.2 GHz 2 MB6 MB95W >
   Phenom II X4 B974 / 43.2 GHz 2 MB6 MB95W >
   Phenom II X4 955 (125W, rev. C2, BE)4 / 43.2 GHz 2 MB6 MB125WUnlock >
   Phenom II X4 955 (125W, rev. C3, BE)4 / 43.2 GHz 2 MB6 MB125WUnlock >
   Phenom II X4 960T4 / 43 GHz3.4 GHz2 MB6 MB95WTBT, Unlock >
   Phenom II X4 B994 / 43.3 GHz 2 MB6 MB95W >
   Phenom II X4 965 (125W, non-BE)4 / 43.4 GHz 2 MB6 MB125W >
   Phenom II X4 965 (140W, BE)4 / 43.4 GHz 2 MB6 MB140WUnlock$81>
   Phenom II X4 965 (125W, BE)4 / 43.4 GHz 2 MB6 MB125WUnlock >
   Phenom II X4 970 (rev. C3)4 / 43.5 GHz 2 MB6 MB125WUnlock$142>
   Phenom II X4 970 (rev. E0)4 / 43.5 GHz 2 MB6 MB125WUnlock >
   Phenom II X4 9754 / 43.6 GHz 2 MB6 MB125WUnlock$153>
   Phenom II X4 9804 / 43.7 GHz 2 MB6 MB125WUnlock$163>
AMD Phenom II X4 family, K10 micro-architecture, Other sockets
   Phenom II X4 9204 / 42.8 GHz 2 MB6 MB140.8W >
   Phenom II X4 9404 / 43 GHz 2 MB6 MB139.6WUnlock >
Other families, K10 micro-architecture, Socket AM2+ / Socket AM3
   Athlon II 170u1 / 12 GHz 1 MB 20W >
   Athlon X2 5200+ (0.045 micron)2 / 22.3 GHz 1 MB 65W >
   Sempron X2 1902 / 22.5 GHz 1 MB 45W >
   Athlon II X2 2802 / 23.6 GHz 2 MB 65W$49>
   Phenom II X2 570 BE2 / 23.5 GHz 1 MB6 MB80WUnlock >
   Phenom II X3 B773 / 33.2 GHz 1.5 MB6 MB95W >
   Athlon II X3 4603 / 33.4 GHz 1.5 MB 95W$69>
 • Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)
 • Background color of specs and features indicate whether they are better or worse than similar spec/feature of the Phenom II X4 840
 • Click on the >  icon to compare any CPU in the table with the AMD Phenom II X4 840 (Javascript required).
 • The 'Price' column shows official AMD prices as of Apr 9, 2014. Prices for obsolete and tray-only processors are not provided.
 • List of related CPUs is not complete.
 • Features abbreviations:
TBT - Dynamic Acceleration / Turbo Boost
Unlock - Unlocked multiplier

Pictures (4)

2011-08-05 01:46:28
Posted by: gshv

Back view
2011-08-05 01:48:01
Posted by: gshv

Side view. The box comes with AVG Anti-virus 6-month trial, which is included on a mini-CD inside of the box.
2011-08-05 01:48:28
Posted by: gshv

Phenom II X4 840 box pictures
2011-08-05 01:49:13
Posted by: gshv

Front view.
Phenom II X4 840 box pictures
Comments (9)

You're welcome to post suggestions, corrections, your own personal AMD Phenom II X4 840 review, or your experience with the microprocessor. Please do not ask upgrade and troubleshooting questions, and do not start discussions.

Phenom In Name Alone

2011-01-22 09:38:29
Posted by: Beraid

It's actually not a Phenom, and it doesn't use the Deneb core. Its a quad-core Athlon using the Propus die and has the same amount of L3 cache as the other Athlons: 0 MB. It is, through and through, an Athlon.

Beraid in doubt alone

2011-02-05 22:12:49
Posted by: Stanley

Chip binning requires parts to be at least functional at some levels. AMD wouldn't have named it Phenom unless the part actually has L3 on die but is disabled because it doesn't work.

Response: Stepping code on the CPU specifies the core: AC - 4 cores + L3 (Deneb), AD - 4 cores (Propus), AE - 2 cores (Regor), CB - 6 cores + L3 (Thuban). Phenom II 840 CPUs have "xADxx AD" stepping code, i.e. it's Propus (no L3).


2011-02-09 02:00:29
Posted by: Stanley

True, but that's just lasered text and programming... the actual stepping isn't baked in the core itself. I was more inclined to think that the 840, since they are for OEM's only, are just Denebs with defect L3. Until you physically take a look at the core, anyone can just speculate. However I find it strange that AMD would ignore the main difference that sets apart Phenoms from Athlons.

X4 840 is a strange bird

2011-03-12 17:29:10
Posted by: Lab Level Nine

i just took one back to retailer. the on-chip temp sensors read 8c at idle and 29c with 90% load on all cores. reported wattage put the chip at 107.4 watts. not 95 watt range. the minimum TDP in win7 was 33.6 watts. 2 different programs gave me the same results in an Asus and a Gigabyte m/b with different chipsets.
the bios temps from the m/b's were both around 21c.
i don't know what is in this cpu and i don't have any idea as to it's longevity. installed an athlon II x4 640 instead of this.

NOT A Phenom

2011-03-15 13:56:49
Posted by: TellTheTruth

This has no level 3 cache.
This is a high end Athlon II X4.
There goes AMD misleading is customers. :/
I am disappointed with AMD.

complaints about phenom II X4 840

2011-04-18 02:16:52
Posted by: TOM

AMD dubbed this a Phenom because it performs better than half of all the other phenoms with L3 up until the 955. If you want L3 Cache pay the extra $30 for the minimal performance increase with the 955. I don't understand why people get so upset with AMD over this. If you had a car that was called a Ferarri, looked like a Ferarri, sounded like a Ferarri, and was just as fast as a Ferarri, but had a different engine and was less expensive.... would you complain?


2011-04-23 05:29:33
Posted by: Bryst

Its neither a Propus or Deneb, Its a Thuban core with a faulty L3 and locked cores. The 840T is exaclty the same but with a L3. Both can unlock 5th and 6th cores, but only the 840T can have a L3.

Response: Thuban core has E0 core stepping. This CPU has C3 core stepping.


2011-08-30 06:33:47
Posted by: daniel

I have Phenom II X4 840, and before unlocking it, cpu-z shows it's a Propus core with no L3 cache. Then I unlock it (using ASUS M5A87 board and asus core unlocker function in bios) and then cpu-z shows it's a Deneb core with 6Mb of L3 cache. I test it and it's stable 100%. So, this is basicaly Phenom II X4 955 with disabled L3 cache and locked multiplier....


unlocked the L3 cache with ASUS Core unlocker

2012-01-01 23:10:34
Posted by: Bill

Here is my 840 with 6MB L3 Cache. Has the AC Code in the serial number

unlocked the L3 cache with ASUS Core unlocker

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