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| Intel Core 2 Duo Blinded by the light | |
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(Review by MS, July 25, 2006) |
Memory Performance Continued
Peak bandwidth is one aspect of memory performance, another aspect is latency. AMD's processors with their integrated memory controller have set new standards in mmeory access latencies and for quite some time everybody expected Intel to follow in AMD's footsteps and, by extension, get rid of the cumbersome PSB for memory accesses. Using 3D representations, it is somewhat difficult to picture the differences betwen two architectures if the cache sizes are different but we have a couple of images that, in combination, should be able to paint a halfway comprehensive picture.
Intel Core 2 Extreme X6800 (blue) vs. AMD Athlon FX62 (green). Overall, the AM2 platform still has significantly lower memory access latencies than the Core 2 platform.
Sometimes a 2D graph of a limited set of benchmark points is more intuitive than the 3D plot of the entire range of data. In this case we plotted the accesss latencies at a stride length of 2k across the different data chunk sizes. Intel Core 2 Extreme X6800 (blue) vs. AMD Athlon FX62 (green). Again, the AM2 platform has significantly lower memory access latencies than the Core 2 platform, however, this is offset by the 4 MB cache and the low access latencies below the 4 MB data size cutoff, which, for all that we know plays a significant role in every day processing
Intel Core 2 Extreme X6800 (red) vs. Intel Core 2 Duo E6700 (blue). Essentially, it is a wash between the two CPUs, which was to be expected since the memory controller is on the chipset and not on the processor die.
Note that Cachemem does not appear to take advantage of any prefetching algorithms that might reduce effective latencies as for example ScienceMark supposedly does.
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Intel Core Duo T2600 (dual core) |
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