I am looking to upgrade my dell xps 8300. I bought a msi hd 6970 for 40$ and am wondering if the 460 watt psu can handle it or if I need to get a new one.
The HD 6970 was a bit of a power hog and the recommended PSU was more in the 550w range. I would not run that combo as it is not only on the edge, but being an OEM unit from Dell is likely not going to get its stated output of 460w. When looking for a PSU, stick with a Tier 1 or Tier 2 unit. Look toward XFX or Seasonic, then if needed turn to Antec or the EVGA G2 lineup.
These guys are often recommended on a budget => http://pcpartpicker.com/parts/compare/seasonic-power-supply-m12ii520bronze%2Cseasonic-power-supply-m12ii620bronze%2Cxfx-power-supply-p1550sxxb9/