I have been using this for over a year now. What I wonder is how to calculate amp requirements for my GPU when it comes to more than one rails like my graphics card which needs two +12v cables to be connected.
http://www.xilence.de/en/products/power-supplies/gaming...
My PSU is listed as having 4 +12v rails. The first two are 18amps and the last two are 20amps.
http://forum-en.msi.com/faq/article/power-requirements-...
Here it says that my graphics card needs around 31A and a 550W PSU.
I have the following hardware:
Gigabyte X79S UP5
5 sata harddrives, 1 dvd writer
1 ssd
Intel i7 3820 running at 4.3Ghz
A PCI wireless card.
How do I calculate how much amps are needed on the two +12 rails for my graphics card?
So if the card requires 550w, and my PSU is 80% efficient:
550 / 12 = my graphics card needs 45 amps
45 / 0.8 = 56 amps ?
Is this how it's calculated? There are two power connectors on the graphics card and I guess it also draws power from the PCI Express slot as well. So how do I calculate this when I'm feeding the card with two power cables?