According to tomshardware.com cpu compairison chart
, the slower processor is actually faster. Now, all they had was the Intell P4 940, and not the 945 that you listed. I can't imagine that there's a huge difference between the two (940 & 945, although I didn't see the 940 listed on newegg.com!), but there's a substantial difference in speed between the 2 you listed, with the P4 D 945 being faster. Reason it's faster is that it's dual core, so ensure that your mobo will support dual core!
War produces veterans, wounded both physically and mentally. They have sacrificed for us.....and it is now our job to help these veterans, as they have already helped us in ways we will never know, in ways that we cannot fathom, and in ways that we take granted every day.