Message boards : Graphics cards (GPUs) : "Invisible" Graphics Card (780ti)
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valterc Send message Joined: 21 Jun 10 Posts: 21 Credit: 8,425,539,672 RAC: 26,092,581 Level  Scientific publications      | |
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Some time ago I bought four 780ti graphic cards, same brand, not reference. All of them died exactly the same way, I was able to get a replacement for the first three (another brand) but not for the last one (out of warranty). I just would like to tell you 'how' they died, in a very strange way, at least for me: | |
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 Retvari Zoltan Send message Joined: 20 Jan 09 Posts: 2343 Credit: 16,206,655,749 RAC: 261,147 Level  Scientific publications | |
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My GTX690 died the same way. Later I've found the two 12V pins on the 24-pinned MB power connector was burnt. These 2 pins power the 4 PCIe slots and the memory and the chipset. The latter two are negligible when there are 4 high-end GPUs installed. The total power consumption of 4 high-end cards from the PCIe slots could be 4*75W at worst case. There is only that two pins on the 24-pin power connector which have to supply that much power. That is 300W+ combined, or 25A@12V. 25A on two pins is simply too much, so it is quite advisable to choose a MB which has extra PCIe power connector(s) to power 4 high-end GPUs in the long term. | |
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eXaPower Send message Joined: 25 Sep 13 Posts: 293 Credit: 1,897,601,978 RAC: 0 Level  Scientific publications  | |
The total power consumption of 4 high-end cards from the PCIe slots could be 4*75W at worst case. There is only that two pins on the 24-pin power connector which have to supply that much power. That is 300W+ combined, or 25A@12V. 25A on two pins is simply too much, so it is quite advisable to choose a MB which has extra PCIe power connector(s) to power 4 high-end GPUs in the long term. Here's an example of extra 6 pin and (4pin) connector MB. (located in between the pcix1 slot and left side VRM cooling element. 4 pin next to the 8pin.) Some boards have an extra 8pin instead of a 6 pin near PCIe. MB also have both an extra 8 and 6 pin.   | |
| ID: 41502 | Rating: 0 | rate:
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valterc Send message Joined: 21 Jun 10 Posts: 21 Credit: 8,425,539,672 RAC: 26,092,581 Level Scientific publications | |
My GTX690 died the same way. Later I've found the two 12V pins on the 24-pinned MB power connector was burnt. These 2 pins power the 4 PCIe slots and the memory and the chipset. The latter two are negligible when there are 4 high-end GPUs installed. The total power consumption of 4 high-end cards from the PCIe slots could be 4*75W at worst case. There is only that two pins on the 24-pin power connector which have to supply that much power. That is 300W+ combined, or 25A@12V. 25A on two pins is simply too much, so it is quite advisable to choose a MB which has extra PCIe power connector(s) to power 4 high-end GPUs in the long term. The four cards were never together (in the same chassis). They died while inside different computers, only the first one died while together with another one in the same computer. The last one died while alone for a long time. I was able to get 980s as replacement for the first three, I just inserted them in the same slot without issues (I'm quite confident that this not a MB or PSU issue). I will double checked the 24pin power connector but I do not think this was the problem. | |
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mikey Send message Joined: 2 Jan 09 Posts: 297 Credit: 6,139,301,071 RAC: 30,124,542 Level Scientific publications  | |
My GTX690 died the same way. Later I've found the two 12V pins on the 24-pinned MB power connector was burnt. These 2 pins power the 4 PCIe slots and the memory and the chipset. The latter two are negligible when there are 4 high-end GPUs installed. The total power consumption of 4 high-end cards from the PCIe slots could be 4*75W at worst case. There is only that two pins on the 24-pin power connector which have to supply that much power. That is 300W+ combined, or 25A@12V. 25A on two pins is simply too much, so it is quite advisable to choose a MB which has extra PCIe power connector(s) to power 4 high-end GPUs in the long term. A friend is checking a 760 that 'just died' on me, he said he found a short between the power block and the fan housing where they were touching, I had replaced 2 fans on it, and he thinks a plastic spacer or aftermarket fans may bring it back to life. He said that normally the clearance is pretty small so maybe I squeezed it too hard at some point. Mine did exactly the same thing, my fans didn't quit they were just running slowly, resulting in very minor overheating, ie 72c temps, and blowing them out didn't help so I bought 2 replacement fans. After the fan replacement the thing was never recognized by Windows or Linux again, I figured some capacitor had popped but he said nope not that. | |
| ID: 41512 | Rating: 0 | rate:
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Message boards : Graphics cards (GPUs) : "Invisible" Graphics Card (780ti)
