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GTX 780 Ti needs at least 550-600W Quality (80+PLUS Bronze minimum) due to a GPU TDP of 250W
What brand+model 500W do u have?
Besides, you're misguided if you think that the computer will be destroyed. One of three things would happen: The PSU would blow out, the computer wouldn't even start up properly, or the PSU would use a safety shut-off feature to prevent damage. You need to learn more about computers before you can assume such information.
mobo (possibly cpu/ram), gpu, drives or anything plugged into usb ports
Like Corsair HX or AX for example.
Or something from Seasonic or XFX.
http://www.ncixus.com/products/?usaffiliateid=1000031504&sku=59616&vpn=P1650SNLB9&manufacture=XFX&promoid=1264
Overkill, you can run two GTX 780 Ti with 850W PSU. 650W is plenty for one.
And seriously ?! 1000W for a 780Ti ?! U mad bro !
a 650 or 700W PSU will be enough !!
Example;
CPU max/tdp wattage
GPU max/tdp wattage
Factor in roughly 100W for the motherboard and connected component (HDD, SSD, Optical, Card Reader, RAM)
That is what you'll require. All that comes out to roughly 450W w/ high-end/high TDP CPU, like 95W + 250W for a GTX 780 Ti. So with a quality 600W or so, you will have breathing room.
Now if u are planning ahead for possible SLI setup; then by all means get a quality 850 - 1050 watts
i would not trust a diablotek 1050w with a gtx750 in any system
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=187
get a quality power supply
look up reviews, if you cannot find any load testing reviews (via load tester and oscilloscope) do not buy it