I'll uncheck Proc affinity on all my HT systems.
Thanks again......
===================================
"Michael D. Ober" <obermd.@.alum.mit.edu.nospam> wrote in message
news:7_ULd.4189$cl1.109@newsread3.news.pas.earthlink.net...

Set Affinity is used to override Windows default processor selection on a
multi-processor system.  In the case of a true multi-processor system,

this

can slightly improve performance by eliminating processor data cache

misses.

However, on a HT processor, it can cause the processor's data bus to
overload, thus causing the processor to become data starved.

Mike.