Memory performance (continued)
Don't let the 3D graphs scare you. The graphs are indulgent, but they're useful, too. I've arranged them manually in a very rough order from worst to best, for what it's worth. Shorter bars are generally better. I've also colored the data series according to how they correspond to different parts of the memory subsystem. Yellow is L1 cache, light orange is L2 cache, and orange is main memory. The red series, if present, represents L3 cache. Of course, caches sometimes overlap, so the colors are just an interesting visual guide.
Ok, so the order from highest to lowest latency is totally a rough estimate. Don't pay much attention to the order in which the graphs are presented. Instead, look at how much higher the memory latencies are on the 900-series chipsets at the highest step sizes, 2048 and 4096. Obviously, the 915/925 memory controller behaves very differently with DDR2 than the 875P does with DDR. Although our single sample point on the last page showed decent latencies for the DDR2 chipsets, the reality is that it depends very much on how memory is being accessed. It's hard to say which chipset is generally quicker at accessing memory, based on these results.
The one thing we can say with certainty is that AMD's integrated memory controller is very, very quick.