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OC crashing event

post #1 of 13
Thread Starter 
Hey guys - I followed all the guides on here, flashed Skyn3t's 3A bios on my 780 and have been able to successfully up the voltage to 1.325 and beyond. I have been testing the max clocks I can get without artifacts at the lowest voltage, and ran across a strange circumstance. Using Heaven benchmark, I got my clocks up to 1372 core / 7000 memory stable at 1.325v, and that's a repeatable result.

When I run 3dMark, I can get to 1293 core at 1212v or anything above that, with PT (power slider) at 100.

But if I exceed that number by another 25, I get a hard shutdown of my PC as soon as the first test is done loading. I can throw voltage at it (have gone as high as 1.425 (+0.025) for 1.450 with no success. I have backed my memory back to 6000 while doing the above. I have pushed the PT to 150% with no success. I'm at a loss. It's almost as though it sees 1300+ and won't let it run.

Again, I can push the clocks to 1372 @ 1.325 in Heaven / BF4 / Valley, etc., no issues. At these clocks and power I'm getting GPU temps of about 36 C sustained. No artifacts or anything.

I don't feel its a power supply issue. I have a 1000W Rosewill semi-modular PS with 100A no the 12v rails (although it is not single rail) and I have run a 780 ti on this same build and also run 2 780's in SLI on this build (same card in fact as primary) without issues.

Other than backing out my modest 4.5GHz CPU OC (just got the CPU haven't messed with it much yet or BIOS settings) and trying it, I am at a loss.

Any ideas / thoughts / that might get 3dMark to play nice so I can see what kind of score I can achieve?

Thanks!
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post #2 of 13
Quote:
Originally Posted by gqneon View Post

Hey guys - I followed all the guides on here, flashed Skyn3t's 3A bios on my 780 and have been able to successfully up the voltage to 1.325 and beyond. I have been testing the max clocks I can get without artifacts at the lowest voltage, and ran across a strange circumstance. Using Heaven benchmark, I got my clocks up to 1372 core / 7000 memory stable at 1.325v, and that's a repeatable result.

When I run 3dMark, I can get to 1293 core at 1212v or anything above that, with PT (power slider) at 100.

But if I exceed that number by another 25, I get a hard shutdown of my PC as soon as the first test is done loading. I can throw voltage at it (have gone as high as 1.425 (+0.025) for 1.450 with no success. I have backed my memory back to 6000 while doing the above. I have pushed the PT to 150% with no success. I'm at a loss. It's almost as though it sees 1300+ and won't let it run.

Again, I can push the clocks to 1372 @ 1.325 in Heaven / BF4 / Valley, etc., no issues. At these clocks and power I'm getting GPU temps of about 36 C sustained. No artifacts or anything.

I don't feel its a power supply issue. I have a 1000W Rosewill semi-modular PS with 100A no the 12v rails (although it is not single rail) and I have run a 780 ti on this same build and also run 2 780's in SLI on this build (same card in fact as primary) without issues.

Other than backing out my modest 4.5GHz CPU OC (just got the CPU haven't messed with it much yet or BIOS settings) and trying it, I am at a loss.

Any ideas / thoughts / that might get 3dMark to play nice so I can see what kind of score I can achieve?

Thanks!

 

It doesn't have a +12V capacity of 100A because amperage is multiplied by the voltage that you're using. In this case, 12V. So, 100 x 12 would be 1200W. What's the exact make and model of this Rosewill PSU?

 

To get to the question at hand: you're probably just finding the limit of this video card. :/

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post #3 of 13
Thread Starter 


I was incorrect. It is a 1000 watt unit but only has 52A continuous. I'm wondering if this could be a problem with one gpu and one CPU in this build.
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post #4 of 13
Quote:
Originally Posted by gqneon View Post



I was incorrect. It is a 1000 watt unit but only has 52A continuous. I'm wondering if this could be a problem with one gpu and one CPU in this build.

You're probably tripping an OCP on one of the rails. Plug in the extra PCI-E connectors and use those (one from each rail) on the 780.
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post #5 of 13
Quote:
Originally Posted by gqneon View Post



I was incorrect. It is a 1000 watt unit but only has 52A continuous. I'm wondering if this could be a problem with one gpu and one CPU in this build.

 

That label must be extremely wrong. 52A is 624W which would mean that this is just a really crappy 650W PSU at best. 900W is 75A.

 

Even with 624W though, it should still be way more than enough for one video card - but if this unit is really that crappy that it's a 1000W PSU with a +12V capacity of only 624W (52A), then yeah, I would then be saying that this PSU is the culprit. However, I think it's just mislabled and it should really be reading 75A. Again though, if it's really 52A like it says, then wow... That would be one hell of a crappy PSU.

 

Personally, I don't know anything about this PSU (but that's not saying much), so I most likely wouldn't overclock with it until I learned more about it somehow.

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post #6 of 13
Thread Starter 
Ok so this PSU came with a main harness bundle that has a PCIE 6 and 6+2, which I was using on the lone 780. It has two more plug ins for 2 more sets of PCIE pairs, totaling 3 PCIE sets. So I took a 6 pin from one side and an 8 pin from another, hoping I was spreading the load. No more tripped power. I got into the low 1400's on core clocks and I'm convinced that this chip isn't going much further. I'm still pretty pleased overall though. I'm beating mild OC 780ti clocks (I had one and did my own testing for comparison) and since I got this 780 from a guy at a Pizza hut for $400, I'm not arguing that it's a pretty good deal for what it is.

That suggestion got me from the high 1200's into the low 1400's, so good call!

For being a reference card, I'd say pulling into the 1400's reliably is good enough.

Thanks for all the help!

Chap
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post #7 of 13
Thread Starter 
As an update, I found a photgraph on the Rosewill site of this power supply with a label that's identical except that in the total combined power column it says 75A not 52A, which would be more consistent with what everyone's talking about. It's a little shady no one in QC would have caught that and there are others that have seen the same thing that I was able to find online.

I read a HardOCP review of it's original Tuniq 1000W branding and it was mostly within spec, but I wonder if maybe my unit has more variance than their test sample and whether the aging of the capacitors on this (particularly the secondaries) might be occurring. I shouldn't have to split the load with a single GPU, but I understand the math of why that seemed to solve my issue.

Moving onto an SLI setup I think this would be a good PSU to shelf as a back up and move onto a more efficient and well known branded model.

I was thinking Corsair RM850 (slightly exceeds - by about 100-120W - what my rig should produce, overclocked, at 100% load and 100% duty cycle for benching, and knowing that this load would be less than likely to occur very frequently) or an RM1000 to give myself some extra amperage and breathing room with the same build.

I've read people with builds like mine seem to have no issue at all with a quality 850 PSU. And the tests for this unit and its AX860 brethren seem to be almost identical on the test bench, except that the RM is quieter by a LOT.

You guys have a lot of good knowledge, what would you recommend, even if its not what I am thinking?

Chap
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post #8 of 13
Warning: Spoiler! (Click to show)
Quote:
Originally Posted by gqneon View Post

As an update, I found a photgraph on the Rosewill site of this power supply with a label that's identical except that in the total combined power column it says 75A not 52A, which would be more consistent with what everyone's talking about. It's a little shady no one in QC would have caught that and there are others that have seen the same thing that I was able to find online.

I read a HardOCP review of it's original Tuniq 1000W branding and it was mostly within spec, but I wonder if maybe my unit has more variance than their test sample and whether the aging of the capacitors on this (particularly the secondaries) might be occurring. I shouldn't have to split the load with a single GPU, but I understand the math of why that seemed to solve my issue.

Moving onto an SLI setup I think this would be a good PSU to shelf as a back up and move onto a more efficient and well known branded model.

I was thinking Corsair RM850 (slightly exceeds - by about 100-120W - what my rig should produce, overclocked, at 100% load and 100% duty cycle for benching, and knowing that this load would be less than likely to occur very frequently) or an RM1000 to give myself some extra amperage and breathing room with the same build.

I've read people with builds like mine seem to have no issue at all with a quality 850 PSU. And the tests for this unit and its AX860 brethren seem to be almost identical on the test bench, except that the RM is quieter by a LOT.

You guys have a lot of good knowledge, what would you recommend, even if its not what I am thinking?

Chap

RM series has a few cheap components and is generally not recommended since you can find higher quality units for about the same money or less.

Choose one from here if you must get a new unit but I don't see a reason to replace your existing PSU:
http://www.overclock.net/t/183810/faq-recommended-power-supplies/0_20
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post #9 of 13
Thread Starter 
**I guess my sig upload didn't take. My system is:

i7 4770k @ 4.5 / 1.35v
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post #10 of 13

With one GTX 780, even overclocked and overvolted that high, all you need is a good quality-made 650W PSU.

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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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