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AMD Athlon 64 4000+ and FX-55
By CPU-zilla
Category : CPU
Published by Jimmy Tang on Tuesday, 19th October, 2004


The New Athlon 64 4000+ and FX-55

Today, AMD pushes the performance envelope even higher with the introduction of the new Athlon 64 4000+ and Athlon 64 FX-55 processors. Although AMD has recently announced that they will begin manufacturing 90nm processors, these new 90nm parts are not due until the later part of this quarter although reports about the availability of these processors have begun circulating around the Internet. These high speed processors would still be manufactured in the 130nm SOI process as we think AMD's yield for that process is much better at this point of time, although things may change once AMD has mastered the 90nm SOI process.

The new Athlon 64 4000+ and Athlon 64 FX-55 processors are now clocked at 2.40GHz and 2.60GHz respectively. If you exclude the clock speed and compare its specifications, the two processors are exactly identical. In fact, if you compare the technical specifications of the Athlon 64 4000+ and the older FX-53, you'll find that they have the same clock speed, and the same L2 cache size. In essence, the Athlon 64 4000+ is a replacement for the FX-53 while FX-55 is now the fastest Athlon 64 processor for the desktop.

If this isn't confusing enough, the older Athlon 64 3800+ is actually clocked at 2.40GHz, similar to the Athlon 64 4000+ processor. However, the only difference between them is the L2 cache size, where the 4000+ is equipped with up to 1MB of cache. Thus, if you were to benchmark these two processors side by side, you won't find much difference in terms of performance if the benchmark is just solely measuring the processor speed. Therefore, in certain cases, you might be better off buying the cheaper Athlon 64 3800+ processor.

Confused yet? Well, let's clear the confusion a little by referring to the table below:-

Comparison With Older Athlon 64 Models
Processor Model AMD Athlon 64 3800+ AMD Athlon 64 4000+ AMD Athlon 64 FX-53 AMD Athlon 64 FX-55
Clock Frequency 2.40GHz 2.40GHz 2.40GHz 2.60GHz
L2 Cache Size 512KB 1MB 1MB 1MB
Manufacturing Technology 0.13µm SOI 0.13µm SOI 0.13µm SOI 0.13µm SOI
HyperTransport Frequency 1GHz (2GHz bidirectional) 1GHz (2GHz bidirectional) 1GHz (2GHz bidirectional) 1GHz (2GHz bidirectional)


The Athlon 64 4000+ processor is supposed to compete with an equivalent Intel Pentium 4 processor clocked at 4GHz and it doesn't seem that Intel is ready to release any 4GHz parts soon. In fact, it was reported recently that Intel has no plans to release any 4GHz processors this year. Rumors so far only points to Intel's plan to release a 3.80GHz processor later this year, and a Pentium 4 Extreme Edition processor clocked at 3.46GHz (running at 1066MHz FSB). For now, AMD seems to top the performance chart with pretty impressive specifications. However, we will have to reserve further comments until we see some benchmark scores. Here's a comparison of AMD's new processors against what Intel is currently offering.

Current High-End Processor Technical Specifications
Processor Model AMD Athlon 64 4000+ AMD Athlon 64 FX-55 Intel Pentium 4 560 Intel Pentium 4 3.4GHz Extreme Edition
Codename ClawHammer ClawHammer Prescott Northwood
Manufacturing Technology 0.13µm SOI 0.13µm SOI 90nm (0.09µm) 0.13µm
No. of Transistors 105.9 million 105.9 million 125 million 178 million
Die Size 193 mm² 193 mm² 112 mm² 237 mm²
Front Side Bus - - 800MHz 800MHz
L1 Cache (data + instruction) 64KB + 64KB 64KB + 64KB 16KB + 12KB 8KB + 12KB
L2 Cache 1MB full-speed 1MB full-speed 1MB full-speed 512KB full-speed
L3Cache - - - 2MB full-speed
Clock Multiplier 12x 13x (unlocked) 18x 17x
Clock Frequency 2.40GHz 2.60GHz 3.60GHz 3.40GHz
HyperTransport Frequency 1GHz (2GHz bidirectional) 1GHz (2GHz bidirectional) - -
HyperTransport Links 1 1 - -
Core Voltage 1.50V 1.50V 1.25V - 1.40V 1.525-1.60V
Current (Icc) - Max 57.4A 80A 119A 83.9A
Thermal Design Power (Max) 89W 104W 115W 109.6W
Hyper-Threading Technology No No Yes Yes
x86 64-bit ISA Yes Yes No No
NX Bit (No eXecute Bit) Yes Yes No No
Feature Sets MMX, SSE, SSE2, 3DNow!, new 128-bit SSE/SSE2 MMX, SSE, SSE2, 3DNow!, new 128-bit SSE/SSE2 MMX, SSE, SSE2, SSE3 MMX, SSE, SSE2, SSE3
Form Factor Socket-939 Socket-939 LGA775 Socket-478 / LGA775

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