PSU,Or CPU

Hey,ive been having problems with my computer Inspiron 531s ive been having blue screen crashes and i thought it was my cpu but i really dont know but this is what happens ive noticed that changed since i got my graphics card upgrade and psu upgrade when i turn on my pc i hear the fans and everything sounds and looks as if its working but my screen dont get anything intill after a while the fan rise very loudly then a beep goes and then the computer acutally start to display something.and my cpu been getting up to 100% but i think its normal.. for me.. is it my powersupply?

Inspiron 531s
Radeon 5670
2.0Ghz Proccesor(SINGLE)
320w powersupply KDM (Going to send back just realised it wasnt vertified)

What is the best power supply for my dell inspiron 531s DX
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More about tomshardware
  1. bit offtopic but y do you need 5670 when you have single 2.0 cpu? and 320 watt psu ont sufficient enough for that card,

    http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/ati-radeon-hd-5670-overview/Pages/ati-radeon-hd-5670-overview.aspx#3

    you need atleast 400watt, and that is a GOOD psu with 400watt,
  2. cause i used a psu calculator and it said i only needed 300w to run all of it because im just using a little home desktop and im using it for gaming do u know a powersupply that will work with a Inspiron 531s
  3. did i mention it wasnt the reguluar 5670 its Radeon 5670 LOW PROFILE sapphire
  4. An ATI Radeon HD 5670 has a Maximum board power of 64 Watts (5.3 Amps from the +12V rail).

    The SeaSonic SS-300TFX Bronze 300W TFX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply - OEM for $44.99 will fit in the Dell Inspiron 531s' slim line case and is probably the best TFX form factor power supply unit available. With its ability to provide 21 Amps on the +12 Volt rail it will have no problems powering your system with the Radeon HD 5670.
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