well i have had 2 prime examples.
1. ME. has an OMNI case, with generic OMNI 300W psu. while it didnt die, it most definately would have during the heat of summer. i just wouldnt let me overclock beyond 1386mhz (or use 1.85v or greater). since i have replaced the omni with a enermax unit. wonderful difference.
much more stable.
2. sisters Fiance' got a athlon 1.4 with a CODEGEN 350W psu (one would think 350W would be quite sufficient would you?)
basically myself and him tried vainly to problem solve the computer for one month. then one day a smokey smell came out the computer and it wouldnt start anymore. we got a 250W temp replacement and found that, yes, the 350W psu burnt itself out. and nothing was overclocked.
after he saw the sucess i had with my enermax he got one too, and since installing it the number of crashes has reduced 98%. when it does crash its usually a driver problem now.
SO:
symptoms of a poor psu include:
random yet reoccuring lockups and spontaneous reboots, particularly when the cpu and/or graphics card are being utilised eg games.
lockups unable to be cured via any method.
symptoms of INSUFFICENT power are:
low value for 5v line in system monitoring programs. (mine was 4.89v for 1200, but only 4.76v for 1350mhz)
voltage drops in system monitoring programs when the cpu goes from idle to full load (especially the 5v line, mine got down to 4.71v at times. not good)
likewise fan speeds also drop... in my case the HSF fan speed fell so much i could hear the change in pitch!
physical heat output of the PSU. i.e. the 300W omni was pumping out buckets of heat as it was running at full throttle. the replacment enermax merly puts out luke warm air, and it also takes extra air away from the cpu area.
enough detail for ya?
Is that a Northwoody in your pocket or are you just eXPited to see me?