Where can I get a 450 watt power supply?

I need a 400+ watt power supply for my Dell Inspiron 546 ST Slim model case. This is what the case looks like:


It's very slim and small and regular psu's won't fit inside it, I need to replace the Geforce 210 512 64 bit video card inside it with this:


The upgrade is for Cataclysm but the video card requires around 400+ PSU and a 6 pin connector. My current PSU is a 250 watt with a 12V rating of 17A. Can I use my PSU and 3 way split the power from my dvd drive? If not where can I find a PSU capable of fitting in my case and handling this video card?

I cannot swap out the case components to a different case. it's a family PC. I don't want to downgrade to a different video card, there has to be some way to make this work and I came to where the most elite computer people can help me out.

I can run the case without the side panel attached with a air conditioner pointed at it for all I care for overheating issues, I need this video card for WoW Cataclysm, after getting accepted into the beta, I cannot run the new water affects without a fps over 10 on ultra...
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More about where watt power supply
  1. the ATI 5750 hardly draws any power and most generic 350w PSU will run it, luckily this one is not generic
  2. Okay um, my motherboard connector for power is a 4 pinn, I think..? This will power my motherboard and that video card no problems?
  3. it has a 4-pinn cpu power connector but it lacks the PCI-E 6-pin your card needs so forget that idea.

    frankly i would just get this card and call it a day

    no need to upgrade your PSU, its much better then your current card, and your current CPU is what it is. save your cash for a new build.
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