The most perplexing problem I had with the new computer build is that as soon as an instance of Prime95 is running and CPU utilization rate hits 100%, my mouse started jumping all over the place by itself. I don't know why. But a quick test shows that a PS/2 mouse has this problem, while a USB mouse doesn't. Strange. This happens with Windows XP as well as Vista. Not sure if this is a problem with the Quad core Kentsfield, or the motherboard. But, this piece of $10 accessory fixes my problem.
The other problem is that the temperature is running at 70C, that's 15C hotter under load than Jeff Atwood's configuration. Although, I notice that my motherboard also pumps in 1.26v at this load, while his only 1.21v. Oh well, I'm going to have to live with it, I guess.
Early on, I had plan to also overclock this new computer. Mostly because someone else had done the hardwork for me. But seeing how I'm running hotter now, and that Jeff's overclocking is only taking the memory Vista score from 5.0 to 5.3, I'm not so sure that the extra benefit is worth the risk now.
Also, although the package does say "USB to PS/2 Converter", it's really an adapter that turns PS/2 devices to USB. Took me awhile to realize that at the store.