Nicole Harrington wrote:

Hello all,
I have been building/using servers that were dual CPU
AMD Opteron systems for some time.  (usually 246
Opteron cpu's)

Now of course the world is shifting to Dual Core.
Using FreeBSD, what is really the difference, besides
power and ability to shove in more memory, between
having the two seperate CPUS's?
What if I did 2, Dual Core cpu's? Would the SMP
overhead and sharing to a [Giant Locked] disk and or
network erase any benefits?


Dual core or Quad Core CPUs performance are far better compared to more socket CPUs since they get shared access to memory cache and reduce memory latency/probing over AMDs hypertransport bus. Anandtech did a pretty good review of AMD 4x4 system which compares 2 AMD dual cores with a single Intel Quad chip, where the Intel chip clearly outperforms consistantly because of this fact. Even when taking Intel out of the equation the benchmarks consistantly show even better performance with less sockets for AMD.
There appears to be no advantage to having seperate CPU socket systems what so ever.

And yes the power usage is also bad, even though this example is a quad setup the fact still carriers over to Dual vs 2 socket CPUs.
Here we have a Quad AMD setup using a whopping 456watts over Intels Quad 263watt system. Thats a performance per watt difference of 73% if you even choose to see the AMD quad multisocket CPU performance as the same as Intels.


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