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  Pentium 4 Scaling with DDR Memory 
  Feb 04, 2002, 08:30am EST 

Results - STREAM & 3DMark2001

By: Dan Mepham


STREAM essentially illustrates in greater detail what we saw in the latter half of the Linpack benchmark. STREAM presents the amount of memory bandwidth available to the processor. Naturally, DDR333 provides the most bandwidth, while PC133 provides the least. The 500/266 figure actually falls slightly behind that of the 400/266 platform -- this is due to the fact that the memory is actually running very slightly slower in our 500/266 platform (actually 250 MHz DDR, not 266). See the Test Setup section for more information.

It is interesting to note, however, that the scores consistently tapered off as CPU speed increased, albeit by a very slight amount.


The 3DMark2001 scores present a somewhat expected pattern. 3DMark appears to rely (not heavily) on memory bandwidth. Here, we see that the 845/SDR platform does not scale as well as the faster platforms as clock speed is increased. Both the platforms using 266MHz DDR memory (and different FSBs) score virtually identically, indicating that 3DMark2001 favors memory bandwidth as opposed to increased FSB bandwidth.

1. Introduction
2. Processors 101
3. Memory Considerations
4. Test Procedure
5. Results - Linpack & Cachemem
6. Results - STREAM & 3DMark2001
7. Results - Quake 3 Arena
8. Results - MP3 Encoding
9. Results - ScienceMark
10. Results - SPECviewperf
11. Conclusion
12. Appendix A - SPECviewperf

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