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% =
Cachemem Read Mb/s: (i850/i845) x 100% =(1701.3/993.4) x 100% =
Sandra 2001 Int ALU/RAM: (i850/i845) x 100% = (1452/691) x 100% =
Sandra 2001 Float FPU/RAM: (i850/i845) x 100% =(1434/669) x 100% =
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.