Everything worked well at stock settings once I cleared up the memory issue. 64-bit Vista is best installed with only 2 gigs of memory, so I guess that definitely holds true for 32-bit.
I spent a few hours attemping to overclock the system with the P5K Pro. The processor has been clocked beyond 3.2gHz from the stock 2.4gHz and the memory clocked over DDR2-1200, both at stock voltages. Add to that the fact that the power supply is about twice the size needed for this setup, so nothing should hold us back from a decent overclock.
Rather than slowly work up the ladder, I started out with what has always been an easy overclock for the P5K Deluxe: 330 FSB x 9 multiplier = 2.970 gHz, memory at DDR2-1125 5-5-5-15. The system wouldn't boot, so I raised the Vcore to 1.39, and loosened the timings to 6-6-6-20. Still nothing, so I raised the Vdimm to 2.15. Keeping those settings, I started dropping the FSB ten mHz at a time, until I got back to the stock 266mHz, and it still wouldn't boot!
I set everything back to auto and things went back to normal. Like I should have in the first place, I started at stock FSB and gradually raised it. After much experimentation, I finally got a max overclock of 295 FSB x 9 = 26.55gHz, with the memory at DDR2-984 5-5-5-15. I also found that the system would not boot with either the Vcore or Vdimm at any setting but Auto.
During all of this testing, temps were with well within reasonable levels. The only thing that I could determine was that the latest BIOS, which was less than a week old was the reason. I were unable to flash an earlier BIOS with AsusUpdate through Windows, with EZ Flash II and a thumb drive, or with AFUDOS and a floppy, so I was unable to see.
I ran a battery of tests to see the performance of the P5K Pro, first at stock clock, then at our overclock to see if I received a real performance boost from overclocking.
I was well satisfied with the performance of the P5K Pro, both the numbers at stock clock, and the increased performance with overclocking.