Stress test: AMD Opteron Magny-Cours versus Intel Xeon Nehalem-EX

If the number of concurrent processes is large enough (think virtualization), then quad-CPU, 48-core AMD Opteron wins the price-performance race

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The four charts below show the results of the four longer-running tests. The third set of results charted is from a dual-CPU Intel Westmere-EP X5670 server (12 cores total), which I tested for InfoWorld's blade server shoot-out last March. The Westmere-EP benefits greatly from its faster clock speed at lower concurrency levels, but after 24 concurrent processes it can no longer keep up. Hyper-Threading was enabled on both Intel systems.

LAME test
Bzip2 test
Unbzip2 test
MP4-to-FLV test

The moral of this story is like that of the tortoise and the hare. Although the R815 won't break any single-threaded speed records, it has extremely long legs when faced with a significant workload -- and it'll do it for cheap.

Also on InfoWorld:

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