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8Pin to 6Pin mod

post #1 of 9
Thread Starter 
My GTX670CU came with a dual molex adapter - to - 6pin.

I was thinking that maybe its not enough power, since the 6pin is actually 3x12v while one white connector is 1x12+1x5v (double that for the molex).

Still a bit lower than i could provide my card with.

The problem is my PSU, the now extinct ToughPower 750W came with 1x6pin + 1x8pin.

While the GTX has 2x 6pin slots.

What i did is use a pocket knife to shim the plastic between upper 3rd Pin and 4th. I did cut into the connector itself, just made em clear from each other, like they are two parts.



The connector then plugs just fine back on the video card smile.gif)

post #2 of 9
Dont worry about the dual molex. They will carry 20amps constant for a dual molex tongue.gif
12*20 + 12*32 (6pin) + 12*6 (PCIE Slot)
What makes you think it won't handle a overclocked 670? let alone a OC'd 690
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post #3 of 9
Thread Starter 
Its just that the 6pin has 3x12v wires, while with dual molex u get two.
post #4 of 9
Quote:
Originally Posted by seithan View Post

Its just that the 6pin has 3x12v wires, while with dual molex u get two.
Dont worry about that. As long as your power supply is using proper 18AWG cables (they better are) you don't have to worry. PCI-E on the other hand feels like also AWG18 i think.
I've got AWG16 DMM probes so i know pretty much if a PSU's PCI-E cables are abit on the weak side and AWG16 can carry 20amps not a problem PER WIRE. (In open air, not in a case)
Seems like EPS12V/2XATX12V are about AWG16 and indeed they are
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by DaveLT View Post

Dont worry about that. As long as your power supply is using proper 18AWG cables (they better are) you don't have to worry. PCI-E on the other hand feels like also AWG18 i think.
I've got AWG16 DMM probes so i know pretty much if a PSU's PCI-E cables are abit on the weak side and AWG16 can carry 20amps not a problem PER WIRE. (In open air, not in a case)
Seems like EPS12V/2XATX12V are about AWG16 and indeed they are

but how about the fact that the 6pin carries 3x12v wire instead of the 2x12v from molex?
post #6 of 9
Quote:
Originally Posted by seithan View Post

but how about the fact that the 6pin carries 3x12v wire instead of the 2x12v from molex?

Two wires instead of three means 50% higher resistance: 0.00319 ohms / foot instead of 0.00213 ohms / foot (not accounting for return path, the ground wires) for 18 AWG. With say 8A going through each set of two or three wires and a few feet of wires, you might be losing say some tens of mV or so, not too much. Actually, there might be some more from the contact resistance from the adapter. Or something in that range.
post #7 of 9
Unless you are using a really crappy power supply you generally don't have to worry about voltage drops and as i've SAID.
Whether PCI-E is having 3 AWG18 pairs or not it still stands, dual molex is going to carry FAR more than you ever need
20A alone from a dual molex, that sure is enough. IF you're drawing more than that from a single socket i'm afraid you have a legitimate problem with your GPU or you are wasting 600-700W in a single GPU (OC'd to insane heights)
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post #8 of 9
Agreed, it's clearly not an issue (unless in some rare case an adapter comes loose and the resistance around the contact area thus spikes, and you get melting plastic), if the previous posts didn't make that clear.

The calculations are a demonstration of it not mattering. GPU voltage regs are stepping down the voltage anyway. Tolerance range and spec is a lot larger than any difference here.
Edited by mikeaj - 3/17/13 at 1:16am
post #9 of 9
Thread Starter 
Still a nice simple mod smile.gif
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