Advanced Micro Devices has claimed that the additional cache on the Barton core for its Athlon XP processors puts the Athlon XP 3000+ ahead of rival Intel's highest-performing processor.
Athlon XP 3000+, released today, now features 640Kbytes of on-die cache, up from 384Kbytes on the older Thoroughbred core, said John Crank, senior brand manager for the Athlon product line. Otherwise, the processor is identical to older Athlon XPs with a 333MHz front-side bus.
AMD cited benchmark tests that showed the 3000+ processor provided a higher level of performance than Intel's 3.06GHz Pentium 4 processor, which features a technology known as hyperthreading, which allows an operating system or application to believe a system has a second processor in addition to actual chip, causing it to send more instructions to the processor. AMD claimed Intel's hyperthreading technology caused a 4% fall performance, compared with a 3.06GHz processor with hyperthreading turned off
Intel defended its technology. "The Pentium 4 processor gives up to a 25% performance improvement in multithreaded application scenarios," said spokesman George Alfs.
"When a multiprocessor kernel is loaded, there can be a 1% to 2% overhead [drag on performance], but that is more than made up for in a more responsive system when multitasking and running multithreaded applications."
Many users consult benchmarks to compare processor performance, but a benchmark only reflects the performance of that processor for the particular application on which it was tested. AMD used several 3D gaming benchmarks, including Unreal Tournament and Quake III, as well as Sysmark 2001, an office productivity and digital media benchmark developed by the Business Application Performance.
AMD itself attacked the Sysmark 2002 benchmark last year, when it claimed it was altered to favour Intel's Pentium 4 processors. Since making those allegations, AMD has joined BAPCo, but at the time Sysmark 2002 was developed, Intel was the only desktop processor vendor involved in that standards-setting process.
AMD is expected to post the benchmarking results and the specifications of the systems used to obtain the results on its Web site today.
It will extend the Barton core to its previously announced Athlon XP 2800+ processor. When the 2800+ was launched, it was only made available in a limited number of specialised gaming systems, and AMD will not manufacture any more of those 2800+ processors with the Thoroughbred core.
The 2800+ with the Barton core runs with a slower clock speed than the 2800+ with the Thoroughbred core, allowing AMD to keep the same processor rating despite the increased cache, Crank said. AMD's rating system is officially based on the performance of existing processors relative to AMD's original Athlon core, but the numbers mirror the clock speeds of competing processors from Intel.
The Barton 2800+ runs at 2.083GHz, compared with the older 2800+ clock speed of 2.25GHz. The 3000+ runs at 2.167GHz.
A processor with the Barton core was supposed to launch late last year, but was delayed last September. AMD also recently delayed the 64-bit Athlon64 desktop processor until later this year, saying that the Barton core will provide enough performance for the company to stay competitive until Microsoft Corp. delivers a 64-bit version of Windows XP for the x86 instruction set.
The 3000+ processor is available internationally in systems from NEC Computers from otoday, Crank said. Hewlett-Packard is expected to develop a system with the 3000+ processor in coming weeks.
The chip is priced at $588 (£360) in quantities of 1,000 units, compared with a price of $637 for the 3.06GHz Pentium 4 processor in quantities of 1,000 units. With Monday's announcement, the price of the 2800+ drops to $375 from $397.
AMD will launch an Athlon XP 3200+ with the Barton core around the middle of this year.