AMD Athlon 64 FX microprocessor family

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  Athlon 64 FX
  • » K8 microarchitecture
  • » Desktop CPU
  • » Single and dual core
  • » Up to 3 GHz
  • » Up to 2 MB L2 cache
  • » 64-bit
  • » SSE2, SSE3
  • » Virtualization
  • » Unlocked multiplier
  • » 1- and 2-way processing
Socket 940
Socket 939
Socket AM2
Socket F
Athlon 64
  • » Single core
  • » Up to 1 MB L2 cache
Athlon 64 X2
  • » Locked multiplier (except for Black Edition CPUs)
Athlon 64 FX family was introduced at the same time as Athlon 64. While the Athlon 64 microprocessors were intended for desktop computer marker, the Athlon 64 FX was primarily aimed at PC enthusiasts willing to pay premium price for premium performance. FX microprocessors were and still are very expensive - the cost of FX processors was/is at least 50% higher than the price of fastest Athlon 64 or Athlon 64 X2 processor on the market at the time. Difference in performance between FX and fastest Athlon 64/64 X2 was/is about 5% - 15% depending on application, which is significantly smaller than the difference in price. Better performance of FX CPUs was primarily due to higher clocked core and in some cases bigger L2 cache. The microprocessors could have other features making them faster. For example, socket 940 Athlon 64 FX processors had dual-channel memory controller, as opposed to Athlon 64 having only single-channel memory controller.

Athlon 64 FX processors have two-digit model numbers. Single core FX processors have odd model numbers. Dual-core CPUs have even model numbers. Model numbers can be used to tell which FX CPU is faster (higher is faster), but, unlike model numbers of other Athlon and Sempron processors, FX's model numbers cannot be used to estimate how the CPU will perform in comparison with other AMD or Intel microprocessors.

For averaged multi-threading performance of Athlon 64 FX CPUs please see AMD Athlon 64 FX performance pages.

Use the filter below to display microprocessors that have specific feature(s) incorporated:
1 core 2 cores
SSE3 Virtualization

Production microprocessors

AMD Athlon 64 FX-51 - ADAFX51CEP5AK (ADAFX51BOX)
AMD Athlon 64 FX-51, the first Athlon 64 FX processor, was released together with socket 754 Athlon 64 3200+ (ClawHammer) on September 23, 2003. Both processors had 1 MB of L2 cache. Internal frequency of the FX-51 was 200 MHz higher than on Athlon 64 3200+. Athlon 64 FX-51 also had dual-channel memory controller as opposed to single-channel memory controller on the 3200+ CPU. These enhancements translated into up to 10% higher performance, or 5% on average, of the FX-51 CPU over the Athlon 64 3200+.
First Athlon 64 FX processors, like this one, were packaged in 940-pin ceramic micro-Pin Grid Array package, and required socket 940 motherboards. Not only these motherboards were more expensive than socket 754 motherboards needed for early desktop Athlon 64 processors, the FX processors also required more expensive registered (buffered) memory. Combined with high prices of Athlon 64 FX processors, this resulted in high prices of socket 940 Athlon 64 FX systems.
The first socket 939 Athlon 64 FX CPU. The FX-53 CPU in 939-pin micro-PGA package could be used on the same motherboards as socket 939 Athlon 64 microprocessors, which helped to reduce overall price of FX systems. Another advantage of this processor over socket 940 processors was support of cheaper unbuffered DDR SDRAM memory. Performance-wise this processor was as fast as Athlon 64 4000+. In fact, this processor was re-branded by AMD as Athlon 64 4000+ (ADA4000DEP5AS).
The Athlon 64 FX-60 is clocked internally at 2.6 GHz, which is 200 MHz slower than the single-core Athlon 64 FX-57. While this CPU usually outperforms the FX-57 in many benchmarks, it may be slower than the FX-57 in applications that don't use second CPU core. When compared to Athlon 64 and Athlon 64 X2 processors, the FX-60 has better performance than most of them with the exception of Athlon 64 X2 5200+ and faster Athlon 64 X2 CPUs.
At this time (December 2006) this is the fastest desktop socket AM2 Athlon 64/FX processor. This CPU performs better than any other AMD Athlon 64/64 X2/FX processor except FX-74, as well as any other Pentium 4, Pentium 4 Extreme Edition or Pentium D CPU. In many tests the Athlon 64 FX62 performs better than the Core 2 Duo E6400. Still, the FX-62 is slower than the Core 2 Duo E6600, E6700 and X6800 microprocessors.

FX 76 - unreleased

2014-05-24 16:47:30
Posted by: nerd73

There is an unreleased FX-76. It was planned, but never made it.

Clock speed: 3.2 GHz
Core count: 2
Thread count: 2
Dual CPU capable: Yes
Other: Same as FX-74

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At a glance

64-bit microprocessor
Sep 23, 2003
Technology (micron):
0.09, 0.13
The number of cores:
1, 2
Frequency (GHz):
2.2 - 3
L2 cache size (MB):
1, 2