Intel V8 Eight-Core Platform Benchmarked
 

Even the games that are formally optimized for multi-threading, such as Quake 4 and Supreme Commander, run relatively slow on a dual-processor system with quad-core Xeon X5365 processors. The thing is that despite optimizations these games can form a limited number of threads. Namely, Quake 4 creates only two threads, and Supreme Commander – four. This doesn’t allow Intel V8 system to show its real advantage, while the memory subsystem with higher latency aggravates the result even more.

http://www.xbitlabs.com/articles/cpu.../intel-v8.html