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~~The GTX 670 Overclocking Master-Guide~~ - Page 253

post #2521 of 3357
Hi all, I was thinking that should I change evgas vrm heatsink when I install h2o 620? For memory I use Enzotech's copper heatsinks.
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post #2522 of 3357
Quick question, for a constant 1137MHz core clock, would do you think the average voltage would be for it?. I have a hard time believing that 1.175v is needed for 1137Mhz when 0.987v can run the card at 915MHz

I don't want to run too high of a voltage unless i absolutely need to. And i know its trial and error.. Just looking for some feedback on what other users may think the required voltage would be.
     
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post #2523 of 3357
Hey guys. I got a question about two unusual things I got with my card.

1) My 670, for whatever reason, only reaches a max of 70% power usage. I have done tests in BF3 with 64 players, did about 20 Valley/Heaven benchmarks, and it still only reaches 70%. Thing is, if I use any other driver besides 320.18, the power % goes down to 30%. I messaged ASUS and they said it shouldn't have any affect on performance, but how would I know if I was hitting the TDP limit if it shows an incorrect reading?

2) This question I believe has something to do with my first one. So far, I can only get +65 on my core offset without it showing me a ridiculous clock speed in games. So my card boosts up to 1032MHz if temps stay under 58C and boosts up another 13MHz when it goes over, so +65 makes my card go up to 1097MHz with temps below 58C, and once again boosts up 13MHz with temps over 58C to 1100MHz. I overclock by +13MHz each time, but if I go, for example +77 or +90 and continue with +13, my card goes up to 1150MHz. Isn't that odd? If I put +77 shouldn't it be at 1100MHz and then 1113MHz if my temps go past 58C?

I don't fully understand how to overclock Kepler 100% but I don't think that is normal behavior.

Any help?
post #2524 of 3357
I am confused as to how this process works. I increased my clock offset by increments of 20mhz and was checking gpu-z to see my core and boost clock. I eventually had my boost to around 1267mhz....but in unigine my card was running at around 1215mhz and then spiked to 1347mhz and crashed. How can the card exceed the boost clock I have set? Also, my power usage never goes above 80%, why is that? I see other people hitting like 120%
Edited by Fallacy - 6/17/13 at 1:33pm
post #2525 of 3357
Rando question, how safe is to modify how many watts the card can pull with a bios edit? x2 6 pins +75w from mb pci-e slot = 225, 75 + 75 + 75. Is it safe to raise that to say 245w? Reason i ask cause my 1202Mhz core clock is border line stable i just need a little bit more on the power control side.
     
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post #2526 of 3357
Raising the power limit isn't going to help you get a higher stable overclock, all it is going to do is stop the card from throttling for power draw (which can also be accomplished by just increasing the power limit in Afterburner/Precision). The only thing that will help you stabalize a higher clock is modding the BIOS for more core voltage.
post #2527 of 3357
Quote:
Originally Posted by Forceman View Post

Raising the power limit isn't going to help you get a higher stable overclock, all it is going to do is stop the card from throttling for power draw (which can also be accomplished by just increasing the power limit in Afterburner/Precision). The only thing that will help you stabalize a higher clock is modding the BIOS for more core voltage.

i probably said that wrong. What i meant to say was is i have a stable voltage. But my power draw is slightly throttling me. At max it takes 225w. Can i raise it safely to 250w+ without major concern?
     
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post #2528 of 3357
Quote:
Originally Posted by EnthusiastG4m3r View Post


i probably said that wrong. What i meant to say was is i have a stable voltage. But my power draw is slightly throttling me. At max it takes 225w. Can i raise it safely to 250w+ without major concern?

 

Gotcha. There appears to be a hardware limit in place, so there shouldn't be any problems changing the BIOS to allow higher power draw. Lots of people have modded them to allow 150% (instead of 132%) for example. I probably wouldn't hard-mod the card, but I don't htink you are going to hurt anything with a software or BIOS mod. Surprising you are outdrawing the card though, since my 680 at 1315/1.21V never drew more than about 125% power - don't 670s have the same power limit?
post #2529 of 3357
Quote:
Originally Posted by Forceman View Post

Gotcha. There appears to be a hardware limit in place, so there shouldn't be any problems changing the BIOS to allow higher power draw. Lots of people have modded them to allow 150% (instead of 132%) for example. I probably wouldn't hard-mod the card, but I don't htink you are going to hurt anything with a software or BIOS mod. Surprising you are outdrawing the card though, since my 680 at 1315/1.21V never drew more than about 125% power - don't 670s have the same power limit?

I have a modded bios with a forced voltage of 1.1875v and a constant clock with no boost at 1202Mhz on the core. I modded the power control targets to max out at 220w 5 below the cards official max, on min default and max so that there would be no fluctuation and it would be consistent.

Heres a pic



The numbers on the left are related to the watts for the power draw, numbers on the right are the fail safe settings.

I want to raise the last number on the left (max) higher so that it doesn't throttle with my current OC, but just wanted to make sure it was safe to do so and wouldn't fry anything.

I needed to raise my voltage from 1.175v which is stock max, to 1.1875v to run a stable 1202 on core and 3104 on memory.

Default the Power Control numbers are :

min - 100000 | min - 100000
def - 142500 | def - 172400
max - 172400 | max - 200000
Edited by EnthusiastG4m3r - 6/18/13 at 12:27pm
     
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post #2530 of 3357
Yes, you can safely increase it. I'm not sure why you chose to do it that way, but you still aren't going to overdraw the card no matter what you set in there. Are you sure you are power limiting though? It's pretty unusual for power limit to be an issue once it is increased above the stock 100%.
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