Jaded TC wrote:OK, if the power supply is adeguate what would be keeping it from getting enough power?
Possibilities (all are still SWAG's in this case! )
1. Well, not all power supplies meet rated power. That is one issue. You have to get a reliable manufacturer to do that.
2. Sometimes, to get high current in the +5 and +12 volt lines, they use what are called multiple "rails". Sometimes, these are insufficient for a given load (like a graphics card).
3. Yes, the total supply may be higher than you need, but the specific current on the voltage line to the card may be too low.
Most importantly, you just said that the card needs 300W and you are running a 430W supply. Yes, the mftr probably is taking into account a "typical" system, but you may simply need more than that, if you have other stuff in the system.
I would strongly suggest trying a good 600W to 650W supply and see if that cures your problem - these will run between $60 - $85 or so.
Z