Originally Posted by Dustin_Broke
Before anything I need to know how can you tell when you are using too much power when adding a new video card? Like will the system now power up or something like that? If so then probley forsure I need a power supply and maybe the 250 watt one will work.
There's several ways to tell it wouldn't work. Either right of the bat, it won't power up. It could shut down after a few minutes. You could hear a loud pop, meaning your PSU fried. You could completely ruin the video card/motherboard for not feeding it/them enough amperage.
As a rule of thumb, get as many amps on the 12V that your budget will allow.
This doesn't mean buy a PSU that claims 30+ amps on a 12V rail for $20 new. This means, buying a REPUTABLE brand that your budget will allow. A lot of low-end manufacturers test their equipment in simulations/tests that can not be produced in real world applications. Be VERY wary of those, "too good to be true" PSU's.