I just purchased an EVGA GTX 550 Ti video card and the PSU requirements for it are: 400 watt or greater with minimum of 24 amps on the +12 volt rail.
My current PSU has the following specs: 400watt, two +12 volt rails with 16 amps on each one. I'm not sure how the calculations work, but would these two rails combine to provide enough juice for my video card?
The brand of the PSU is Delta Electronics, Inc. and the model is: DPS-400RB A
This power supply unit is part of the Gateway FX7024 I bought about 3 years ago, and it also came with a EVGA Geforce 8800GT video card (which fried just last night) and this PSU was able to support that. And yes, it has the 6pin connector.
Should be fine. The 8800GT had a power draw of 110W. I just looked online and found an OC'd 550TI that had a TDP of 116. The cards should be close enough that 6-10W won't cause an issue. You might to upgrade your PSU as they don't last forever, but you should be fine.