I have a new ASRock X79 Extreme6 mobo with two Gigabyte GTX 670 cards. I have been troubleshooting this system for days, with no luck. When using one of these cards, the system will not boot (fans and lights turn on, but nothing displays on the screen) and throws a "D6" Dr. Debug code which means it doesn't recognize the video card is there. If I plug in a Radeon HD7770 the system will boot and work just fine. I have swapped out my GTX 670 cards, tried other slots, etc. and still cannot get them to work. It is a long story, but I have done all of the basic troubleshooting methods and know for a fact this is VGA related. I would find it pretty hard to believe that both of my GTX 670s are bad. I figured it could be a BIOS generation issues and so last night I updated the BIOS to the latest version using the 7770 card. After that I swapped it out for a GTX 670 but it did not solve the problem. Essentially my motherboard won't recognize either of the 670s.
This got my thinking that maybe the issue is the power supply and that the cards aren't getting sufficient power. The big difference between the 7770 and the 670s is the fact that the first uses one 8-pin connector, while the 670s use one 8-pin and one 6-pin connector. My PSU is a Thermaltake Toughpower 1350W which you can see here. It should have the capability to provide more than enough power. It has (6) PCI 6+2 power connectors and I have tried swapping them out, using different ones, etc. to see if one is faulty but again, this does not fix the issue. I should note that all of these PCI connectors are on one 60A rail. I plan on taking a voltmeter to it tonight just to make sure all cords are providing the 12V they should be.
This PSU thing got me thinking though; the Thermaltake also has four 6-pin, 12V "peripheral" connectors on a secondary rail. There is a warning in bold font to never use these on the CPU socket, which makes sense, but I was wondering if it would be a bad idea to try these in the 6-pin slots on the GTX 670s. They should be the same voltage, so will the cause any harm? The PSU also comes with several 4-pin Molex connectors and a couple of 4-pin to 6+2-pin PCI adapters. It would stand to reason that I could try using these adapters to rule out faulty cords or power ports on the PSU, right? I just want to make sure I'm not going to damage the video cards by trying any of these combinations. I would think that simply trying to POST wouldn't put a huge strain on the video cards and so only low amperages would be required.
Any thoughts or advice? Are there any cords that I should absolutely never use on the video cards, aside from the 8-pin EPS CPU connector which I know is a "no-no"?
This got my thinking that maybe the issue is the power supply and that the cards aren't getting sufficient power. The big difference between the 7770 and the 670s is the fact that the first uses one 8-pin connector, while the 670s use one 8-pin and one 6-pin connector. My PSU is a Thermaltake Toughpower 1350W which you can see here. It should have the capability to provide more than enough power. It has (6) PCI 6+2 power connectors and I have tried swapping them out, using different ones, etc. to see if one is faulty but again, this does not fix the issue. I should note that all of these PCI connectors are on one 60A rail. I plan on taking a voltmeter to it tonight just to make sure all cords are providing the 12V they should be.
This PSU thing got me thinking though; the Thermaltake also has four 6-pin, 12V "peripheral" connectors on a secondary rail. There is a warning in bold font to never use these on the CPU socket, which makes sense, but I was wondering if it would be a bad idea to try these in the 6-pin slots on the GTX 670s. They should be the same voltage, so will the cause any harm? The PSU also comes with several 4-pin Molex connectors and a couple of 4-pin to 6+2-pin PCI adapters. It would stand to reason that I could try using these adapters to rule out faulty cords or power ports on the PSU, right? I just want to make sure I'm not going to damage the video cards by trying any of these combinations. I would think that simply trying to POST wouldn't put a huge strain on the video cards and so only low amperages would be required.
Any thoughts or advice? Are there any cords that I should absolutely never use on the video cards, aside from the 8-pin EPS CPU connector which I know is a "no-no"?
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