How many watts would i need?

Hi 650w is more than enough, 500 - 550w of a quality psu would be enough.

However, the psu you selected is of poor quality.

GX-650 650 Failed efficiency rating. Failed load testing. Medicore voltage regulation. Poor DC output quality on 3.3V rails. Outdated design. Hard OCP

Tom

hi , thank for the quick reply so i decided to look for another psu with a decent price and this is what i found

Silver Power SP-SS500 500W PSU but im not sure if it can run SLI or Crossfire

and if you have any PSU in mind that can run SLI or Crossfire i would highly appreciate it

From where will you be buying? Link a website so that we can help you.

Where are you looking for your PSU's? Are these from a store or online (and what country)?

Reason I am asking is because I couldn't even find that brand of PSU on Newegg.com.

I would instead look at PSU from a more recognizable company. Also, what is your budget? Try searching for a PSU that is at least "80 PLUS" rated, but preferably at least "80 PLUS Bronze". There are a few (bronze ones) on Newegg.com for $68-$80 before any rebates, taxes, or shipping is applied.

here is the site, im from norway and this is the only site i know where i can find computer parts

http://www.komplett.no/k/k.aspx

Hi again - tot sys power draw with two 660's will run about 440w, so I would say
550w would be the min & you might want to go a little higher, maybe even the 650w
you mentioned earlier except a decent brand.

what's your budget? need to know so I can recommend

don't know your budget but these are quality units:

http://www.komplett.no/k/ki.aspx?sku=657686

http://www.komplett.no/k/ki.aspx?sku=771294

http://www.komplett.no/k/ki.aspx?sku=657685

http://www.komplett.no/k/ki.aspx?sku=635819

my budget would be around 500 - 1000 kroner (80 - 120$)

try to obtain this
http://www.komplett.no/k/ki.aspx?sku=758532

Great - the 1st one I linked the XFX 650 @ 739kroner will work
very well for you.

Tom

I agree, the first one you linked http://www.komplett.no/k/ki.aspx?sku=657686 will work perfectly.