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To: jim kelley who wrote (59191)	10/30/2000 8:37:37 AM
From: Dan3	Respond to of 93625

Re: It is a pretty funny release! The Athlon on a VIA KT133 is thus a little faster than the Pentium III on the i840 because of its larger L2 cache, however with the newer Intel 5.0 Beta compiler the 840 would be virtually on par with the KT133. The i815 gets penalized the most here since it has the same amount of memory bandwidth as the KT133 but it lacks the Athlon's large on-die cache. Now take a look at the Athlon on the AMD 760 with a full 2.1GB/s of CAS2.5 PC2100 DDR SDRAM. The performance is no less than 54% greater than the second fastest KT133. Even with the new Intel 5.0 Compiler Beta the Athlon on the AMD 760 would enjoy at least a 50% performance advantage. The high latency of RDRAM, even in spite of the dual channel nature of the i840's implementation of it, is too high to compete with DDR SDRAM in this case. The peak performance does not change, further supporting the idea that this is mostly a cache/memory test and there's very little you can do to make it perform better on any given CPU other than increasing the clock speed or dramatically changing the architecture. ============================================= The APPLU benchmark plots the solution of five Partial Differential Equations on a 3D-grid. In this case you're dealing with quite a bit of data yet again, however the Athlon architecture in general seems to be providing quite a bit of the performance advantage over the Pentium III here. For example, the Athlon on the KT133 is 14% faster than the Pentium III on the i840. Drop the Athlon in an AMD 760 board with PC2100 DDR SDRAM and a 266MHz FSB and all of the sudden you've got a 52% advantage over Intel's fastest solution. The performance benefit here comes from a combination of the DDR SDRAM and the increased FSB. For the two Intel platforms, peak optimizations did not do much however on both of the Athlon platforms the more aggressive optimizations improved performance by a noticeable degree. ====================================================== anandtech.com