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Is my PSU limiting my overclocking ability? 670 Power Target and Overclocking. - Page 3

post #21 of 32
I'm having hard time believing that. What CPU are you running and at what kind of overclock if there is any? Shouldn't the PSU shut itself down if it was overloaded rather than limit the GPU's power? headscratch.gif
post #22 of 32
It's not your PSU.

Setting your power target higher isn't going to make that card go to that value.
 
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post #23 of 32
Thread Starter 
Quote:
Originally Posted by deafboy View Post

It's not your PSU.

Setting your power target higher isn't going to make that card go to that value.

But it does allow the card to go to that value when necessary. In an identical setup, same mobo, CPU, GPU, yet with a higher wattage PSU with a higher amperage 12V, the GPU did in fact reach a higher value. Running the same benchmark with the same settings.

I understand that different cards act differently...but the fact that we both have a power target of 145% and only one of us can reach it with identical set-ups makes me suspicious. But prove me wrong! I'd love to find out that my PSU is fine, and that perhaps in the future I'll do better in the GPU lottery.
post #24 of 32
Thread Starter 
Quote:
Originally Posted by DNytAftr View Post

Im not sure what your system rig is, but im currently using the 450 watt psu with my GTX 670 SC (4gb) and SG05, according to my meter im only pulling 300 watts on load (from the wall). tongue.gif So i would say from what i can tell it shouldnt be the PSU

That's true, my wattage has generally been pretty low. I think I maxed around 260-280 from the plug (AC) while playing BF3, with an i5-3570K at 3.8.

But so far this is the only evidence that would point to my card being the problem.
post #25 of 32
Quote:
Originally Posted by Brandonandon View Post

But it does allow the card to go to that value when necessary. In an identical setup, same mobo, CPU, GPU, yet with a higher wattage PSU with a higher amperage 12V, the GPU did in fact reach a higher value. Running the same benchmark with the same settings.

I understand that different cards act differently...but the fact that we both have a power target of 145% and only one of us can reach it with identical set-ups makes me suspicious. But prove me wrong! I'd love to find out that my PSU is fine, and that perhaps in the future I'll do better in the GPU lottery.

It is unlikely, the maximum boost clocks on kepler are controlled by a number of things that may add up to yours not boosting high enough to eat up the whole available power target. One of my 660's only goes to around 130% while the other will go to 165% with a flashed BIOS, and the cards are identical. That being said, I did pop a 450W SFX PSU with a 670, H77 board and non-OC'd E3 Xeon.
post #26 of 32
Thread Starter 
Hmmm... Do you think using Nvidia Inspector to set the P-state and lock the clockspeeds would result in any difference, since you believe Kepler Boost 1.0 has something to do with it?
post #27 of 32
Quote:
Originally Posted by Brandonandon View Post

Hmmm... Do you think using Nvidia Inspector to set the P-state and lock the clockspeeds would result in any difference, since you believe Kepler Boost 1.0 has something to do with it?

I really don't think so, more likely the clock speed the chip will run without crashing just doesn't need the extra few %. I wouldn't worry about it in all honesty, it probably is just an efficient chip. Check the ASIC because that factors in to the Kepler boost.
post #28 of 32
Thread Starter 
Alright, thanks. smile.gif I'll check that when I get my system reassembled.

My GPU isn't stable at the clocks speeds my friend has achieved. :/ I would blame power draw, but maybe it's just the silicon lottery.
post #29 of 32
Quote:
Originally Posted by Brandonandon View Post

Alright, thanks. smile.gif I'll check that when I get my system reassembled.

My GPU isn't stable at the clocks speeds my friend has achieved. :/ I would blame power draw, but maybe it's just the silicon lottery.

What were his clocks? I've had a half dozen 670's at this point and they varied wildly. One would only manage about 1100mhz while two of them would push past 1400.
post #30 of 32
Quote:
Originally Posted by Brandonandon View Post

But it does allow the card to go to that value when necessary. In an identical setup, same mobo, CPU, GPU, yet with a higher wattage PSU with a higher amperage 12V, the GPU did in fact reach a higher value. Running the same benchmark with the same settings.

I understand that different cards act differently...but the fact that we both have a power target of 145% and only one of us can reach it with identical set-ups makes me suspicious. But prove me wrong! I'd love to find out that my PSU is fine, and that perhaps in the future I'll do better in the GPU lottery.

Define an ideal setup?

When I was just running 1 card it still never got anywhere near that. And that's with a PSU with a 62A 12v rail. 3930k at 5.2GHz and 16GB of 2133 RAM. All watercooled. Same deal when I added a second card.

The power target is there if the card needs it, most cards don't. Or if you have modded it and are doing properly extreme stuff.
 
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Intel X25-M G2 80GB Redundant 840W PSU Dell 710 2.5" - Google Search Appliance Dell Perc H700 Raid Controller 
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Dell iDRAC6 Enterprise Mellanox Connectx-2 10Gb SFP+ NIC 
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