Forester, that is not necessarily true. As I said I also use 3dsmax. Max is optimized for single processor, dual-processor AND Intel SSE, SSE2 and HT instruction sets. 3dsmax does not suffer from the same problems as vue and P4 hyperthreading, yet it also works as expected on dual-processor machines. Not all software sees HT as dual-processors. Poorly written software, maybe, but not all software. Maybe I should do some 3dsmax benchmarks on my machines, to compare the results to my vue results. This would prove 3dsmax is indeed seeing the HT correctly and vue is not. Your arguement may make sense for regular vue, but Vue Pro specifically states on their Vue Pro product website: *Multi-processor rendering support for unlimited number of processors. *Optimized for G5 & P4 HT. You're saing it's not E-On's fault that hyperthreading sucks on their software, yet right there ON THEIR PRODUCT PAGE they claim to suppport HT technology. You're probably right though. Vue didn't bother to update Vue Pro to correctly use HT and instead figured "well, hyperthreading just makes the software think it is two CPU's...we already have dual-processing code, let's just slap a 'HT certfied' sticker on it and be done with it." I call this deceptive product labeling, but that isn't a first for e-on...ie the "pro" moniker of Vue Pro...what a joke...this app is anything but "pro." About the CPU cache, the older Athlons have a !256k! cache, not 2 mb. My P4 prescott has a 1 mb cache, 4x the cache on my AMD chip...so I'm not sure where you got that bit of info. Maybe you're thinking of the operton processors?