Please tell me about power supplies/graphics wattage

Toggle sidebar Toggle sidebar
Solution
smorizio
with power supplys it the 12v rail you want to look at. it the wattage and amp rating of the unit and how well the brand is.
with the12v rail you have the cpu wattage and the gpus. so if it an intel haswell (84w) max.
http://www.evga.com/Products/Product.aspx?pn=03G-P4-3784-KR (show cards draw 250w max)
so your looking at 600w needed on the 12v rail for the cpu and the two gpu.
the power supply vendor rated the 12v line at 71a. so you take 71a times 12v is 852w so you have 252w more then needed for the max of the gpu and the cpu. with no name units or low tier units they will lie on the about of the vgoltage the power supply can output. if there just a wattage rating the devied wattage by the voltage to get the amps.
so if a 850w...
Sort by date Sort by votes
smorizio

smorizio

Titan
Jan 22, 2010
30,984
9
125,315
with power supplys it the 12v rail you want to look at. it the wattage and amp rating of the unit and how well the brand is.
with the12v rail you have the cpu wattage and the gpus. so if it an intel haswell (84w) max.
http://www.evga.com/Products/Product.aspx?pn=03G-P4-3784-KR (show cards draw 250w max)
so your looking at 600w needed on the 12v rail for the cpu and the two gpu.
the power supply vendor rated the 12v line at 71a. so you take 71a times 12v is 852w so you have 252w more then needed for the max of the gpu and the cpu. with no name units or low tier units they will lie on the about of the vgoltage the power supply can output. if there just a wattage rating the devied wattage by the voltage to get the amps.
so if a 850w unit showed 600w on the 12v line you would be 50 amps max. they would have to show the other rails using the other 250w.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817822030
look the 12v rail rated for 53 amps that 636w. where the other 100w used???
 
Upvote 0 Downvote
Solution
someguynamedmatt

someguynamedmatt

Distinguished
Feb 7, 2010
1,551
0
20,160
850w is plenty of power for a single GTX 780, but I'd recommend a 1000w supply if you want to have two in SLI. An 850w PSU would probably handle two of them them, but you'd have very little headroom, and it's a good idea to not run a power supply at 100%, as it generally reduces both the power supply's lifespan from added stress, and maybe even your components' lifespans as voltages can get a little shaky at near-limit levels on less solid units.

For one, 850w is enough. For two, go with 1000w to be safe, though it technically would be overkill. That's what I'd do in your situation.
 
Upvote 0 Downvote
M

Miketang

Honorable
Jan 29, 2014
19
0
10,510



So my 850W gold is fine then from what you're saying if i understand what you just said? lol the one guy below said 1000W to be safe
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom