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  i845, Performance Bottlenecks? 
  Sep 26, 2001, 08:00am EDT 

Memory Benchmarks

By: Sander Sassen

One of the first things we’d naturally be interested in is how the memory subsystem of both chipsets compare to one another, we’ll be using Cachemem to determine memory read/write speeds and as a means to verify Cachemem’s results we’ll be using SiSoft Sandra 2001’s memory benchmark too.

Fig 5. The Cachemem benchmark results, notice how the i850-chipset easily outperforms the i845-chipset.

Fig 6. The Sandra 2001 benchmark results, notice how these results are similar to the Cachemem results.

Naturally it needs no further explanation that the memory bandwidth of the i845-chipset is roughly 1/3 of the i850-chipset’s bandwidth due to the use of PC133 SDRAM. If we look at the Cachemem and Sandra 2001 results once more in terms of % increase, or decrease, in performance we find the following:

Cachemem Write Mb/s: (i850/i845) x 100% = (778.2/420.1) x 100% = 85%

Cachemem Read Mb/s: (i850/i845) x 100% =(1701.3/993.4) x 100% = 71%

Sandra 2001 Int ALU/RAM: (i850/i845) x 100% = (1452/691) x 100% = 110%

Sandra 2001 Float FPU/RAM: (i850/i845) x 100% =(1434/669) x 100% = 114%

From the above derived results we can see that the i850 is respectively 85 and 71% faster in read/write throughput than the i845 when using the Cachemem benchmark. As for Sandra 2001, the i850-chipset is 110 and 114% faster in this STREAM benchmark than the i845.

And although you cannot judge the performance of a CPU-chipset combination solely by its memory bandwidth, this doesn’t look good for the Pentium 4 as its performance is largely determined by memory bandwidth as a result of the NetBurst architecture.

1. Introduction
2. Testing and methodology
3. Memory Benchmarks
4. Office Benchmarks
5. Multimedia Benchmarks
6. Conclusion

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