3D Studio Max 6, Canopus ProCoder v1.50, Cinebench 2003, Kribibench v1.1
3D Studio Max 6
The 840 EE didn't hang around long enough for us to get some comparative numbers, and it repeatedly crashed on the Opteron 175 system (the 275 system with a CPU removed). The HEXUS SuperStress v2 uses the multi-threaded MentalRay render core and doesn't use any GPU acceleration, doing everything on the CPU(s). Under XP 64-bit it actually gets slower, however the Opteron 275 system under either OS version, is way faster (more than twofold on XP 32-bit) than the single FX-55.
3D modelling and rendering is another class of application that can be greatly sped up by multi-threaded programming.
Canopus ProCoder v1.50
Another class of applications that can benefit hugely from multi-threading is video encoding. ProCoder is used to transcode an MPEG2 video clip at greater than DVD resolution, to WMV9. Under XP 32-bit, the Opteron 275 is nearly 15% faster than the single core FX-55.
Under XP 64-bit the Opteron 275 gets faster still
Encoding the same file but to a non-streaming version of WMV9, the Opteron 275 is slightly slower under 64-bit XP, which is the opposite of what happened in the streaming encode version of the test. The Opteron 275 beats the Opteron 175 system, indicating ProCoder can use more than two threads while encoding video.
Cinebench 2003
I report the multi-threaded score where applicable with Cinebench.Cinebench will use whatever you can feed it, in terms of execution resources, and use it well. A score of over 1000 is by far and away the fastest we've ever measured. The Opteron 275 system runs away from the Opteron 175 system here. So if Cinema 4D rendering is what you do for a living, your dream system just made itself known.
Kribibench v1.1
As Tarinder mentioned in his review of the dual-core, HyperThreaded, four-threads-of-execution-in-one-CPU-package, Pentium Extreme Edition 840, that its score of 12.17 was showing off as the fastest we've ever measured.
Under XP 64-bit, the four-thread Opteron 275 nearly doubles that with a score in the 20fps range. A single Opteron 175 is slightly slower than the EE 840, and the test gets faster for the 275s under XP 64-bit.