weak 3.3V rail?

[hfc]

i am using a new antec neohe 380W psu and system consisting of:

P4 1.8 @2.5
9800 pro
512Mb ram
1 HDD
1 DVD-rom
1 80mm fan
1 zalman vga cooler fan, and 1 stock cpu fan

with this set-up i managed to burn out a cheap oem psu when gaming at 12x10 that dragged down the 3.3V rail. it used to make the screen blink, so i could only ever play at 10x7 to prevent this from happening. in the end, the psu still blew.

so, i replaced it with the antec. but even now at 12x10 gaming, i occassionally get a flicker of the screen when it blanks out for a split second, and asus probe reports around 2.9V on the 3.3 rail, though much less often than previously (like once or twice in an hour compared with once every 30sec).

I used the extreme psu calc and it shows my system should only be pulling around 225W with the 9800pro.

btw, i used to use the 9800pro in another rig with an extra HDD, more fans and P4 2.4@ 3.2G using an Enermax 350W psu with no probs whatsoever.

Does anyone know what the problem could be? I find it hard to believe that the Antec can't power this system sufficiently. it's certainly not cheap by my books.

btw, the antec is readings on asus probe is approx:
11.9 on the 12V
4.9 on the 5V
3.0 to 3.2 on the 3.3 (fluctuates even when idle)

..and i'm disappointed cos my enermax is always above the rated values and is as stable as a rock.

 

[Susquehannock]

First thing you should do is take the readings with a volt meter instead of trusting software.

Any chance the overclock is causing your instability? Or maybe you sustained some
damage when the other PSU blew.