Power supply question

[Sharplucas]

Hey Guys, I just wanted to ask with a Gtx 670 or 7970 could you get away with a 650w Psu with a Nice Oc on the Gpu and Cpu?

 

[jeff6475]

ye will be fine its only if you gonna go SLI/xfire in the future you will need about 850 to be safe

 

[shadow_boxer]

Will be fine as long as its a decent branded one.

 

[jamesfreddie]

What brand PSU is it?

 

[Sharplucas]

This One:

http://www.overclockers.co.uk/showproduct.php?prodid=CA-022-CS

And thanks for the fast Input guys!

 

[shadow_boxer]

Perfectly fine. Good PSU, I have the 750W version.

 

[jeff6475]

corsair spot on will be perfect

 

[Sharplucas]

Never Mind, Decided to go for the 750w Since it was Only a little more

 

[ingramt]

a follow on question to this.

i have noticed the corsair hx/tx 650w is like 54A where as my PSU is 700W but 46A, my understanding is that Watts = Voltage * Amps. the corsair then is 648W, my PSU is 550W so where does the 700W that my PSU is 'rated' at come from and what if anything am i not understanding, how does this make a difference?

 

[beejjacobs]

a follow on question to this.

i have noticed the corsair hx/tx 650w is like 54A where as my PSU is 700W but 46A, my understanding is that Watts = Voltage * Amps. the corsair then is 648W, my PSU is 550W so where does the 700W that my PSU is 'rated' at come from and what if anything am i not understanding, how does this make a difference?

You're understanding is correct about watts (power) = V*A

It's just the companies choosing to rate it differently. So pay attention more to the amps on the 12V rail than the wattage rating.

'cheap' PSUs tend to state a higher wattage, e.g.
http://www.overclockers.co.uk/showproduct.php?prodid=CA-059-OP&groupid=701&catid=123&subcat=1709
is only rated at 44A => 528W

 

[holymonk]

Yes