System crashes when mining..

[Real_nimr0d_3]

I have two gigabyte r9 280x rev 1.0 clocked at stock speeds, now if I mine at stock speeds at 13 intensity (which is the best level for 280x) I get around 600khash/s from first and 650khash/s from the second card, but the system crashes about 3 hours later, and if I lower the core clock to 1050 from 1100 (which is suppose to get better khash/s and it does) the system crashes about in a minute (intensity level 13).
To run the system stable I have to lower the core clock to 1050 and the run the first card at 12 intensity and the second card at 13 and I get around 550 khash/s from first card and 750khash/s from the second card.
Would like to hear your thoughts about this issue??
And also this PC that i'm mining with was my first build, so I have a question, I used PCI extended cables to plugin the two cards, these cables have 3 pci heads, one goes into psu and the second one in the first card and third one in the second card, so are the cards suppose to be powered this way, I was thinking maybe this cable is the issue coz the cable cant take the power for both 8 pin connectors on both the cards, because it still is one cable, so can that be the issue, or these cables are meant to be used to multiple gpu's for cable management and have no issue with carrying power for both cards????


Thanks.

[scaryjam823]

I have two gigabyte r9 280x rev 1.0 clocked at stock speeds, now if I mine at stock speeds at 13 intensity (which is the best level for 280x) I get around 600khash/s from first and 650khash/s from the second card, but the system crashes about 3 hours later, and if I lower the core clock to 1050 from 1100 (which is suppose to get better khash/s and it does) the system crashes about in a minute (intensity level 13).

To run the system stable I have to lower the core clock to 1050 and the run the first card at 12 intensity and the second card at 13 and I get around 550 khash/s from first card and 750khash/s from the second card.

Would like to hear your thoughts about this issue??

And also this PC that i'm mining with was my first build, so I have a question, I used PCI extended cables to plugin the two cards, these cables have 3 pci heads, one goes into psu and the second one in the first card and third one in the second card, so are the cards suppose to be powered this way, I was thinking maybe this cable is the issue coz the cable cant take the power for both 8 pin connectors on both the cards, because it still is one cable, so can that be the issue, or these cables are meant to be used to multiple gpu's for cable management and have no issue with carrying power for both cards????

Thanks.

I would try using a separate cable for each graphics card first and see what that does.

[Real_nimr0d_3]

I would try using a separate cable for each graphics card first and see what that does.

Haven't tried that but I ran the first card only at 13 Intensity Unclocked to 1050mhz and still crashes, so I doubt its a power issue.

[scaryjam823]

Haven't tried that but I ran the first card only at 13 Intensity Unclocked to 1050mhz and still crashes, so I doubt its a power issue.

To find out what's wrong you have to find out what's not wrong. Even if you think something wouldn't be the problem, you still have to check because it could be anything. Take one of your graphics cards out and then try mining with just the one if you don't have another cable. If it's stable, then swap the two cards. If it is still stable then the power cable is your issue.

[Real_nimr0d_3]

To find out what's wrong you have to find out what's not wrong. Even if you think something wouldn't be the problem, you still have to check because it could be anything. Take one of your graphics cards out and then try mining with just the one if you don't have another cable. If it's stable, then swap the two cards. If it is still stable then the power cable is your issue.

Ok boss, trying it now.

[LmeAde2]

I mine on my ASUS R9 280X DCUII at 745Kh/s with these settings.

 

core 1.081V, core clock 1076MHz, mem 1500MHz

concurrency 8192, vectors 1, GPU threads 2, worksize 256, and intensity 13

[Real_nimr0d_3]

To find out what's wrong you have to find out what's not wrong. Even if you think something wouldn't be the problem, you still have to check because it could be anything. Take one of your graphics cards out and then try mining with just the one if you don't have another cable. If it's stable, then swap the two cards. If it is still stable then the power cable is your issue.

Seems to be stable for now with one card. but getting around 650khash/s, weird thing hapnd, i took out the side panel disconnection side fan right, and now when i'm plugging back in it only works on 5v, from 5-7-12v switch in front of the fractal design define r4, and so does the front intake fan.

[scaryjam823]

Seems to be stable for now with one card. but getting around 650khash/s

That's good, switching the cards tells you if one card is bad. But if both cards are stable when ran individually and your system is stable, then power delivery is the issue.

[Real_nimr0d_3]

That's good, switching the cards tells you if one card is bad. But if both cards are stable when ran individually and your system is stable, then power delivery is the issue.

 weird thing hapnd, i took out the side panel disconnection side fan right, and now when i'm plugging back in it only works on 5v, from 5-7-12v switch in front of the fractal design define r4, and so does the front intake fan.

[scaryjam823]

 weird thing hapnd, i took out the side panel disconnection side fan right, and now when i'm plugging back in it only works on 5v, from 5-7-12v switch in front of the fractal design define r4, and so does the front intake fan.

What size power supply do you have? And I'm not sure about that.

[Real_nimr0d_3]

What size power supply do you have? And I'm not sure about that.

ahh it was just a pheripheral cable(Not sure if that what its called,)that got loose, not sure how to plug them, its almost impossible to plug them correctly.

I have Ax860i

[Real_nimr0d_3]

Thanks a lot, it was the Pci cable issue. Now, the system is stable except the first card reaching upto 82 degrees and higher. Should I replace the sp120 at the side panel with AF140 or something else??? 

[scaryjam823]

Thanks a lot, it was the Pci cable issue. Now, the system is stable except the first card reaching upto 82 degrees and higher. Should I replace the sp120 at the side panel with AF140 or something else??? 

Well the first card will get hotter because it is pulling heat from the second card, that's just something that's normal when running 2 graphics cards. But 82c is not that bad, I know the 290 hits 95c which is really hot but amd says it's fine.  :huh:  You can download afterburner and manually adjust your fan speeds to keep them running cooler. For example my 780 runs at about 72c on auto fan speed. But I can put it fixed at 70% and it cools to 60c. As long as you're not hitting 100c you're good. And I thought it was the cable because it sounded like a power delivery issue But I'm glad it's working now.

[Real_nimr0d_3]

Well the first card will get hotter because it is pulling heat from the second card, that's just something that's normal when running 2 graphics cards. But 82c is not that bad, I know the 290 hits 95c which is really hot but amd says it's fine.  :huh:  You can download afterburner and manually adjust your fan speeds to keep them running cooler. For example my 780 runs at about 72c on auto fan speed. But I can put it fixed at 70% and it cools to 60c. As long as you're not hitting 100c you're good. And I thought it was the cable because it sounded like a power delivery issue But I'm glad it's working now.

Ya, u said 82c is not that bad for a 290 but I have a Tahiti 280x

[scaryjam823]

Ya, u said 82c is not that bad for a 290 but I have a Tahiti 280x

I know I don't know what's normal for 280's so I was using a 290 as a rough guide  But 80c-90c is perfectly fine for graphics cards. Like I said you could try manually adjusting the fan speed and it would cool it down or even change the fan curve so the fans kick on sooner would help also.