On October 9, 2001, AMD introduced the Athlon XP desktop processor family with model numbers such as 1500+ and 1800+ that were not clock speeds. The Athlon XP 1800+, for example, ran at 1.53 GHz. AMD said its rating reflected performance relative to competing processors, arguing that megahertz alone could mislead when chips used different designs.
What AMD announced on October 9, 2001
AMD launched the first Athlon XP desktop processors with four model numbers: 1500+, 1600+, 1700+, and 1800+. Their actual clock speeds ranged from 1.33 GHz to 1.53 GHz, according to Computerworld’s October 9, 2001 report.
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The naming system was branded as a Performance Rating. The 1800+ was the most conspicuous example: it ran at 1.53 GHz, while AMD claimed it could outperform processors running at 1.8 GHz. That was AMD’s performance claim, not a promise that the processor would beat every 1.8 GHz chip in every program or computer.
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AMD said “XP” stood for “extreme performance for Windows XP,” and the processors used a core formerly codenamed Palomino. Those were launch-era company descriptions, not independent assessments of the chip’s performance.
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- AMD Athlon XP 2500+ Barton 1.833GHz 512KB L2 Cache Socket A CPU Only, No Fan or Box
What the Performance Rating meant—and what it did not
A relative-performance label, not a frequency
The number followed by a plus sign was a model designation, not the processor’s clock rate. AMD presented it as a way to convey relative performance when comparing its newer Athlon XP architecture with earlier Athlons and competing processors. The Guardian’s February 2002 account describes the label as a “bridge metric”: a way to give buyers a performance reference while the industry lacked a more meaningful universal measure. It is therefore too simple to say AMD merely renamed each chip to match an Intel clock speed.
The available launch coverage does not establish the full methodology AMD used to assign each initial rating. The labels should be read as AMD’s positioning, not as a standardized score or a guarantee across different applications and system configurations.
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- High-speed Athlon XP processor
- Advanced microarchitecture
- Fully pipelined floating-point unit
- Hardware data pre-fetch
- Advanced two-level translation look-aside buffer (TLB) structures
Clock speed still mattered, but it was not the whole comparison
Clock frequency counts cycles per second. It does not, by itself, tell you how much useful work a processor completes in each cycle. Different architectures can do different amounts of work per cycle, and software, memory behavior, and other system components affect results. The Los Angeles Times’ explanation notes that a lower-clocked processor can be faster in some circumstances if it does more work per cycle or handles data more effectively.
That does not mean frequency is irrelevant or that a lower-clocked chip is generally faster. It means clock speed is one specification among several, and a comparison is most useful when it reflects the programs and tasks a person actually cares about. In the launch report, AMD product marketing manager Mark Bode put it this way: “At the end of the day, consumers need to be looking at how applications actually perform.”
AMD’s broader effort to get beyond megahertz
AMD described the Performance Rating as part of a broader True Performance Initiative intended to encourage a better way to communicate processor performance. In September 2002, The Washington Post reported that AMD had documented tests in three areas: office productivity, digital media, and 3-D gaming.
Those tests covered Athlon XP processors in a single PC assembled by AMD. They were not a universal, cross-vendor retail rating. The contemporary reporting supports the conclusion that AMD wanted consumers to look beyond clock frequency; it does not show that the company established an industry-wide performance standard.
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- AMD Athlon delivers responsive, reliable computing for everyday users
- Includes Radeon Vega 3 Graphics for smooth videos and gaming
- 2 Cores / 4 Processing Threads, includes near-silent cooler
- 3.2 GHz Clock Frequency, 5MB cache, DDR4-2667 support
- Socket AM4, platform-upgradable to Ryzen
How to compare processor performance
A higher clock speed does not automatically mean better performance, but neither does a model number settle the question. When comparing processors, look for results from the same applications or workloads, ideally on comparable system configurations. Independent benchmarks covering the tasks you perform are more informative than a single headline figure.
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- Match the workload: Results for office work may not predict performance in games or digital media tasks.
- Check the system around the processor: Memory, chipset, and software can influence the result.
- Treat clock speed as one data point: It describes cycles per second, not the amount of work completed in a particular application.
- Check what a benchmark actually tested: A score from one configuration or a narrow set of tasks may not apply to another system or buyer.
The Los Angeles Times reported that Intel, AMD, and Apple agreed independent benchmarks across a range of applications were the best basis for choosing a system, while also pointing out that no single reliable measure could represent every kind of use. The practical lesson is to compare like with like and prioritize workloads that matter to you.
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- AMD Athlon XP 2600 CPU Processor Socket A 462 Pin 1.917 GHz 333FSB 512 Cache
- Barton Core
Other numbers in the launch report
Computerworld listed the launch prices for orders of 1,000 units as $252 for the Athlon XP 1800+, $190 for the 1700+, $160 for the 1600+, and $130 for the 1500+. These are historical bulk-order prices from 2001, not present-day retail prices. The report also attributed to AMD a claim that the Athlon XP used 20 percent less power than previous versions; that figure is AMD’s launch-era claim, not an independent test result established here.
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