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AMD Motherboards & CPUs Questions or comments on AMD products?


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Old 13th January, 2006, 10:22 PM
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There are other differences as well. The most notable one would be the NUMA (Non-uniform memory architecture).

With the A64's (hypothetically speaking) if performing SMP the memory bus has to be shared by both CPU's/Cores. However, in the case of an Opteron, a Hypertransport link connects the 2 cores/CPU's and the memory buses are independant.

In case of a NUMA system, processors experience low latencies for accessing local memory (especially compared to an SMP system). At the same time, remote memory (belonging to the other processor) is accessed at higher latencies. That's where the non-uniform memory organization notion originates from.

To take advantage of this, you must enable PAE (Physical Address extention) in your registry.

Hope this helps.

S-N
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