AMD Phenom X4 microprocessor family

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Athlon 64 X2
  • » K8 microarchitecture
  • » 0.065 and 0.09 micron
  • » Desktop CPU
  • » Dual core
  • » Up to 3.2 GHz
  • » Up to 2 MB L2 cache
  • » 64-bit
  • » SSE2, SSE3
  • » Virtualization
Socket 939
Socket AM2
Socket S1 (S1g1)
Phenom X4
  • » K10 microarchitecture
  • » 0.065 micron
  • » Desktop CPU
  • » Quad core
  • » Up to 2.6 GHz
  • » 512 KB L2 cache per core
  • » 2 MB L3 cache
  • » 64-bit
  • » SSE2, SSE3, SSE4a
  • » Virtualization
Socket AM2
Socket AM2+
Phenom X3
  • » Budget desktop CPU
  • » Triple core
  • » Up to 2.5 GHz
Third Generation Opteron
  • » Server CPU
  • » Up to 3.1 GHz
  • » Up to 6 MB L3 cache
  • » Up to 8-way processing
Phenom II X4
  • » K10 microarchitecture
  • » 0.045 micron
  • » Desktop CPU
  • » Quad core
  • » Up to 3.7 GHz
  • » 2 MB L2 cache
  • » Up to 6 MB L3 cache
  • » 64-bit
  • » SSE2, SSE3, SSE4a
  • » Virtualization
Socket AM2+
Socket AM3
Phenom X4 is the first quad-core microprocessor family based on K10 microarchitecture. First two members of Phenom X4 family, Phenom 9500 and 9600, were introduced in November 2007. Shortly after that AMD offered Black Edition of the Phenom 9600, and in a three more months, in March 2008, released 5 more Phenom X4 microprocessors. At this time (September 2008) the lineup of Phenom quad-core microprocessors consists of 14 processors, including three mid-power CPUs and four Black Edition CPUs.

All Phenom X4 processors include basic features of K10 micro-architecture:

  • Split 128 KB level 1 cache and exclusive 512 KB level 2 cache per core.
  • 2MB level 3 cache shared between all cores.
  • Support for Streaming SIMD Extensions up to SSE3.
  • SSE4a instructions.
  • AMD 64 technology.
  • Enhanced Virus Protection.
  • AMD-V virtualization technology.

The Phenom microprocessors support Cool'n'Quiet, CoolCore technology, and other power-saving features. Like other K8 and K10 families, the Phenoms use on-chip memory controller and one HyperTransport link to communicate with memory and peripheral devices. The HypertTransport link on almost all Phenom X4 CPUs is clocked at 1.8 GHz, which is almost twice as fast as the frequency of HyperTransport links in Third Generation Opterons.

Phenom X4 CPUs are manufactured in 940-pin micro-PGA package. The Phenom processors can be used in both socket AM2 and socket AM2+ motherboards. One of the main differences between these sockets is the version of supported HyperTransport protocol. Socket AM2 doesn't support newer and faster version of the HyperTransport protocol, like socket AM2+ does, as a result Phenom CPUs will automatically downgrade to slower HyperTransport protocol when they are plugged into socket AM2.

Phenom X4 CPUs use 4 digit model numbers that start from '9'. Remaining three digits in the model number indicate relative processor performance.

For averaged performance of Phenom X4 processors please see AMD Phenom X4 multi-threading and single-threading performance pages.

Use the filter below to display microprocessors that have specific feature(s) incorporated:

Production microprocessors

AMD Phenom X4 9500 - HD9500WCJ4BGD / HD9500WCGDBOX
Author: gshv
Core revisions BA and B2, which correspond to part numbers ending with "BGC" and "BGD" respectively, had a Translation Look-aside Buffer (TLB) bug where, under certain conditions, the processor could lock up when loading cached TLB data. This bug was referenced in AMD documentation as errata 254: "Internal Resource Livelock Involving Cached TLB Reload". Temporary bug fix was to disable TLB caching, which had negative impact on processor performance. The temporary fix (or patch) was implemented in BIOS, and was also included into operating systems. On some motherboards it was possible to disable the patch in BIOS and thus increase performance by 10% on average. In cases, when disabling the patch was not supported by a motherboard, or when the patch was enabled by operating system regardless of the BIOS settings, it was still possible to disable the patch by manipulating MSR registers directly with the help of software tools.
Hardware fix for the infamous "TLB bug" was implemented in core revision B3 of Phenom and Third-Generation Opteron microprocessors. These CPUs no longer required the temporary fix, and, as a result, had better performance than B2-revision processors. Actual performance gain in newer processor was very dependent on application type. The gain could be unnoticeable in small, CPU-bound applications, or it could be as high as 60% - 70% in memory-intensive applications, such as WinRAR. On average, B3-revision CPUs had 5% - 10% higher performance. To reflect their better performance, AMD added 50 to their model numbers. For instance, this 2.2 GHz Phenom X4 processor with B3 core stepping has model number 9550, while older B2 stepping Phenom X4 CPU with the same internal clock frequency and CPU features has model number 9500.

Engineering / Qualification / Other samples


B2 stepping

2008-08-11 12:44:47
Posted by: Peter

Other that the TLB erratum crippling the B2 stepping CPU's, I have experienced a lot of stability issues with the 9600 Black Edition with B2 steppings, which did not occur with my X2 processor. I replaced memory, CPU and mainboards several times, and only after insisting a B3 (NON BE) stepping replacement and installing it I managed to get a stable setup.

Beware when buying 2nd hand B2 stepping phenoms, they seem very pickey on mainboards and power supplies. Stability issues may occur.

B2 Stepping

2008-10-30 11:20:09
Posted by: Bob

That's interesting Peter, I've been running a 9600 black edition for 6 months now on a DFI Lanparty 790FX board and its been very good. Runs happily overclocked at 2.5Ghz core and 2000MHz HT. Which is identical to the 9850. I've not experienced any TLB crashes either even though I have the TLB patch disabled in the BIOS. I think it really depends on your luck with each individual chip.


2008-11-08 08:35:09
Posted by: André

Men many sites have thoroughly tested these B2 steppings, in hope to see what is this TLB Bug.
And the results: Didn't reproduce.

These TLB issues, i believe it happens more oftenly in workstations, servers, professional things, we average users, if we experience such crashes we were prized.

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Nov 19, 2007
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