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GIGABYTE Odin PSUs with Software Control - Page 4

post #31 of 35
Quote:
Originally Posted by DuckieHo View Post
It should not matter too much if the cable lengths are short and the 6-pin PCIe is dedicated to the video card. 6-pin PCIe plugs have two +12v wires and the most power that can be drawn is 75w. Therefore, each wire must conduct 3.125A. 8-pin PCIe is rated for 100w. Most PSUs use 18ga wire.

The Vdrop of 18ga wire the distance of 2ft is 0.082v when conducting 3.125A. When you split the line for the 8-pin PCIe, the same wire has to carry 50w instead of 37.5w. That means it would have to transmit 4.17A. The Vdrop over the same distance is 0.11v. Not that bad.
Which is why they extra two leads are both grounds. Less resistance for each wire, so they can transmit more current.
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post #32 of 35
Quote:
Originally Posted by stargate125645 View Post
Which is why they extra two leads are both grounds. Less resistance for each wire, so they can transmit more current.
Note: I found out 8-pin PCIe is rated for 150w, not 100w.

Yes, but two 18ga wires are good enough to carry 75w each... as long as it is a dedicated line from PSU to video card AND the wire lengths are not long.
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post #33 of 35
Quote:
Originally Posted by DuckieHo View Post
Note: I found out 8-pin PCIe is rated for 150w, not 100w.

Yes, but two 18ga wires are good enough to carry 75w each... as long as it is a dedicated line from PSU to video card AND the wire lengths are not long.
You are just proving my point. Reread what I posted! I said that the adapters wouldn't make a difference if another 12V lead were required.
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post #34 of 35
Quote:
Originally Posted by DuckieHo View Post


theres something wrong with those pictures, doesnt make sense to have the negs and positive flipped on teh 6 vs 8pins if the r600 can take both 6 and 8 pins
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post #35 of 35
Quote:
Originally Posted by mz-n10 View Post
theres something wrong with those pictures, doesnt make sense to have the negs and positive flipped on teh 6 vs 8pins if the r600 can take both 6 and 8 pins
Read all the posts; this was already pointed out.
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