• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

Power to the CPU is it 12+

EllisDJ

EllisDJ

EllisDJ

Associate
Joined
18 Feb 2010
Posts
563
Location
Essex
Hi

Does anyone have direct knowledge to confirm this for me please.

The power to the CPU 4 pin is 2 wires 12V+ and 2 Ground

Thanks very much
 
That's correct a pair of +12V lines (Usually Yellow) and a pair of ground lines (Black). This is the separate P4 (CPU) 4 pin connector.

 
Last edited:
Rated at 100W according to the ATX spec. The 8 pin cpu cable is four wires at +12, four at 0, rated at 200W. Eight pin pci-e, weirdly, is 3 at +12 and five at 0.
 
JonJ678 said:
Rated at 100W according to the ATX spec. The 8 pin cpu cable is four wires at +12, four at 0, rated at 200W. Eight pin pci-e, weirdly, is 3 at +12 and five at 0.
Click to expand...

Electrons flow from negative to positive. Hence more negative lines than positive.

The 8th wire is actually meant to be a +12v sense wire but has never been used by the power supply makers and is just wired as an earth to trick the GPU into thinking its there.
 
Electrons are a continuous field, not a load of little balls flowing along a wire, but that doesn't help me follow your reasoning. Why would the direction of current flow mean you need more wires on one side of the card than on the other?

If the 12V wires are carrying 50W each (on the spec limit), the 0V wires still get to carry 30W. Current is conserved and all that. It doesn't really matter which direction you consider current to be flowing, the three wires still get hotter than the five wires.

Interesting point about using the forth wire as sense though, thanks.
 
Having more negative connections provides less resistance and less chance of a voltage drop across the load. This allows a larger load to be drawn with less chance of fluctuation and greater stability.

Electrons move from areas where there are excess of negative charges to areas where there are a deficiency (or positive charge). Electrons move from "-" to "+".

DC (Direct current) always flows in one direction. AC (Alternating current) flows in either direction. The 12v lines in a pci-e connector use DC.

Electron flow is basic science and not my consideration.
 
Last edited:
MOOGLEYS said:
Having more negative connections provides less resistance and less chance of a voltage drop across the load. This allows a larger load to be drawn with less chance of fluctuation and greater stability.

Electron flow is basic science and not my consideration.
Click to expand...

I'm with this guy!
 
You must log in or register to reply here.
Back
Top Bottom