I have dual L5640 Wesmere processors (dual 6 core = 24 thread) and I get horrible performance no matter which exe I use... or even running via Linux, 100 h/s is about all I get. Is there a bug or something I'm missing?
Try it with 6 threads per cpu, that should better fit the L3 cache and make sure the miner recongnizes AES.
Otherwise I need a lot more info.