AMD strictly moderated (AMD)

[chipdesigner]

Another issue is that Conroe has a large 4MB L2 cache. It is the smaller cache AMD parts that will benefit the most from lower latency to main memory.

This and the fact that latency to main memory is about 2x longer on Intel systems, due to the chipset in the middle, so this sort of improvement results in ~ 1/2 the improvement (in % terms) in overall latency to main memory on an Intel system.