Jamison Roof Mar 07, 2005, 11:50 AM Message - Profile - Add Buddy - Alert Moderators
Re: Asus A8N-SLI FAQ
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[The Antec TruePower 550 EPS12V] needs to be modified in order to convert the 8-pin 12-volt connector, coming off of the 2nd 12-volt rail to two 6-pin PCIe power connectors, this is a simple procedure that means extracting the pins from the original connector and splitting them out to two 6-pin PCIe connectors. These will be connected to the GeForce 6800 Ultras directly, hence powering them off of their own 12-volt rail within the power supply.
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I've got the Antec 550 24 pin PSU, and my Xfx 6800 ultra is on its way. I want to make sure I have everything I need to perform the operation above.
-- Does the Xfx come with a conversion power cable I can cannibalize for the pci-e 6 pin connector?
-- The instructions above say to convert a 8 pin connector into two 6 pin connectors. How do 8 pins turn into 12? What am I missing?
Thanks!
Post Edited On: Mar 07, 2005, 12:19 PM
The XFX Geforce Series GPU (Ultra) comes with a pci-e 6 pin with 6 wires that branch into two 4 pin standard molexes.. pci e = 2 yellow - 2 black - 2 brown FEMALE and the two 4 pin molexes have 3 wires each 1 yellow - 1 black - 1 brown MALES
EX - PCI E 6 pin ATX female into video card---------------2 standard molexes male to power supply female (1-2)
Video card.
--yellow---------------------------------------------------------------------------------yellow------------connector 1
--black-----------------------------------------------------------------------------------black-------------connector 1
--brown----------------------------------------------------------------------------------brown------------connector 1
--brown----------------------------------------------------------------------------------yellow-----------connector 2
--black-----------------------------------------------------------------------------------black------------connector 2
--yellow---------------------------------------------------------------------------------brown------------connector 2
So basically the single PCI-E 6pin connector splits into two standard 4 pin male molexes, or a Y. There will be one pin from each connector of the Y male that wont be used (+5V). The grounds (black) on the 8 pin ATX are common on the 12 V system, you can wire the browns from the Y's to any one, with the blacks of course, in any order.
With standard power supplies there is one ATX 4 pin connector, the main 20-24 pin, 6 pin aux, etc. for your motherboard and a bunch of standard 4 pin female molexes to supply devices. The male connector provided with the XFX was intended for such standard power supplies, or to be connected to the 4 pin female connector from the supply.
This EPS power supply has an 8 pin ATX connector, 4 pin ATX for the motherboard, the main 24 pin, 6 pin aux, etc.for your motherboard and a bunch of standard female molexes as well.
The 8 pin ATX has - 4 yellows 4 blacks FEMALE.
EX - PCI E 8 pin ATX female from supply
From power supply
--yellow-----------------------------------------------------
--yellow-----------------------------------------------------
--black------------------------------------------------------
--black------------------------------------------------------
--black------------------------------------------------------
--black------------------------------------------------------
--yellow-----------------------------------------------------
--yellow-----------------------------------------------------
You need to take half of the 8 pin ATX's wires and get them onto connector 1
You need to take the other half of the 8 pin ATX's wires and get them onto connector 2
Parallel runs (*1 - yellow (from male molex) to 2 - yellows (1/2 of 8 pin)) (2 - yellows to 2 - yellows) (2 - blacks to 2 - blacks) (2 - browns to 2 - blacks) in any order will be fine, as this is a single rail power supply.
There are a few methods of getting the 8 pin ATX wires to the 2 - 4 pin male molex connectors which consist of only three wires each.
Buy a prefab connector, if available, or do it yourself.
Just remember that the black and brown are ground/negative.
Yellow is 12V +
Red will not be used. (5V +)
1) Can I bypass the 4 pin Molexes and go straight from the 8 pin ATX to the 6 pin PCI-e?
2) What do I do when I get a 2nd 6800 ultra? Can I run two 6 pin PCI-e's from the 8 pin ATX (either through 4(!) molexes or directly)?
1)Yes
[The Antec TruePower 550 EPS12V] needs to be modified in order to convert the 8-pin 12-volt connector, coming off of the 12-volt rail to two 6-pin PCIe power connectors in a 2 card configuration, one 6-pin power connector in a single card config (1/2 of the ATX 8 pin). This is a simple procedure that means extracting the pins from the original 8 pin ATX and the 6 pin PCI e connectors, and inserting the wires from the 8 pin to the 6-pin PCIe connectors. These will be connected to the GeForce 6800 Ultras directly, hence powering them off of the single 12-volt rail within the power supply. Please be careful when doing this, remember to place the wires exactly as they were on the 6 pin before starting. You will damage your video card(s) and or the power supply if you make a mistake.
If you can't extract the pins from the 6 pin PCI e or the 8 pin ATX, as they can be difficult to remove, you can do one of the following;
Remove the 8 pin ATX connector by cutting it off at the base and install new pins (comes in kits), and get a bare 6 pin pcie connector from a computer or electronics store, then insert the pins into the new connector
Remove the male molex connector from the video card by cutting it of at the base. Strip, splice and tape or heatshrink a wire that has the proper male fitting to slip into one pin of the 8 pin molex female ends (sold in stores and use the same colors). Be very careful in making sure that the single fitting (X8) you use is (are) heatshrinked, snugg and wont fall out of the 8 pin ATX connector. Observe color coding!!!
You can also remove both the 8 pin connector and the molexes and splice a wire directly, one for one splices, with the above mentioned grounding scenerio (Black-Brown together). Do a western union ( Western Union splice The electrical connection made by paralleling the bared ends of two conductors and then twisting these bared ends, each around the other) and heatshrink, makes for a more professional looking job. You will be able to remove the 6 pin PCI E from the video card for servicing if needed.
Just giving you some options...
2)Yes
Double up on the grounds from the video card (parallel), brown and black together into one fitting (X4 - new black male fittings), yellow for yellow (X4) This will give you a total of 8 wires.
Mike
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