50w more according to NewEgg's calculatior, grain of salt is that it does not have the GT230 - I used the GT240 instead.
Your original PC vendor sized that power supply to run at ~85% load at all times, since they are cheap bastards and care nothing for you. You very likely exceeded the sticker rating of your power supply when you changed video cards.
And if you read the HardOCP article I linked, sticker rating isn't all...
"No can brain today. Want cheezeburger."
From NGE: Nobody Dies, by Gregg Landsman
http://www.fanfiction.net/s/5579457/1/NGE_Nobody_Dies
Your original PC vendor sized that power supply to run at ~85% load at all times, since they are cheap bastards and care nothing for you. You very likely exceeded the sticker rating of your power supply when you changed video cards.
And if you read the HardOCP article I linked, sticker rating isn't all...
"No can brain today. Want cheezeburger."
From NGE: Nobody Dies, by Gregg Landsman
http://www.fanfiction.net/s/5579457/1/NGE_Nobody_Dies