Graphics Power Draw Question

I just upgraded from an old EVGA 8800 GS to a Gigabyte Geforce 450. The computer and windows boot up just fine, but anytime I start up a game or other high graphics intense program, my computer locks up within 5-10 minutes. As this is the only part that I replaced I'm thinking this is either a graphics card or PSU issue. Anyone have any idea whether the 450 draws more or less power than the 8800 GS? The 8800 ran without issues for years. I have a 450w PSU currently.
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More about graphics power draw question
  1. I can get the exact make/model a little later today, but it just freezes, no restart.
  2. You should be alright with a GTS 450 on a 450 watt PSU... unless it's a shite PSU.
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