What wattage will I need to run 2 7970's in crossfire?

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John Paul

Alright, it's christmas time. Time to get a new pc (my current one is a somewhat subpar 2010 gaming laptop).I already have my $1500 build made but I'm planning to upgrade to a crossfire in the future. So who knows what wattage I'll need for overclocking these puppies and not burning my house down at the same time?

Answer
For a single HD 7970, AMD recommends that you use at least a 500W psu with one 8 pin and one 6 pin PCIe power connectors.
http://www.amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#/2
Since each 7970 draws around 250W.....500W + 250W = 750W without overclocking. Just an estimate, not max power draw. AnandTech shows that two 7970's in CF have a total system power draw of 648W, without oc-ing.
http://www.anandtech.com/bench/Product/588?vs=508
Overclock both cards...add 100W
Overclock the processor...add another 100W

What laptop does sheldon cooper use in the big bang theory?

RAFA

Just wondering, and do you think it would be good as a gaming laptop?

Answer
You know i thought for sure i saw the alien icon on it looks like a alienware m17x red nebula but seeing the dell logo could be a dell xps 17 inch, later on he uses a mac book pro 17 http://resnicscity.files.wordpress.com/2010/07/sheldon_cooper_laptop.jpg

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