I have a P4M800Pro-M motherboard with the Pentium D 805 cpu. Very weak motherboard. I tried two different brands of DDR2 memory, both known to be good, and both failed on this motherboard. One would not boot, the other failed memtest almost immediately. I then tried DDR (PC3200, 2 x512), and that seems to work. The memory scores are really low, but it does work without errors. If you search, you can find others who have had the same experience.
The maximum stable overclock seems to be about 3.0 ghz -- this with a cpu that has run 3.4 ghz at default voltage on a better motherboard.
The onboard video is good enough for Office applications and surfing the web, it will not support Aero Glass.