TenPc :
The CX430 is not rated 80 plus so you are not going to get even close to 80% of the total power, more likely only about 375 watts which will cause a power surge to all hardware and possibly blow your videocard if not everything else.
I'd suggest at least 650 watts so that you are not running at peak power continuously and get one with two of the connectors.
■500W (or greater) power supply with two 75W 6-pin PCI Express power connectors recommended
http://www.amd.com/us/products/desktop/graphics/7000/7950/Pages/radeon-7950.aspx#/2
ifreestylin knows rec pwr, I listed it above.
I listed realhardtechs(their expertise) suggested 500w,
but, he has
enough +12v amps and can run the sys.
AMD & NVidia overstate req to allow for psu's that lie
about their specs and older psu's that may be weak on
the +12v rail(s)
the
80 plus rating has nothing to do with the the DC power
the psu delivers to the components. It does influence how
much power gets pulled from the wall. So, yes a less efficient
psu needs more from the wall.
But, that's not the PSU's power rating.
That PSU can deliver it's rated power(430w tot) and deliver 384w on
the 12v rails, for a sys that will draw approx 275w total during use.
There will be no power surge, and he needs
no where near 650w.