Is there anything else connected to the +12V3 rail apart from the video card? If so it should certainly be moved.
A PCIe connector is 150W which equates to 12.5A so 16A should be more than adequate.
Here's an interesting issue with this monitor I hadn't seen elsewhere, but there were a few people in this thread who had it:
http://forums.whirlpool.net.au/forum-replies.cfm?t=667210&p=1
So, if a VA panel it must be, does anyone know how the ViewSonic VX2025wm (on a 20" AU Optronics P-MVA panel compares to the S-IPS and S-PVA we see in the Dell? I like the NEC but don't like the price premium involved, heh.