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Thread: GTX770 Power Limit

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    Default GTX770 Power Limit

    I have a GIGABYTE GV-N770OC-4GD (GIGABYTE GV-N770OC-4GD GeForce GTX 770 4GB 256-Bit GDDR5 PCI Express 3.0 HDCP Ready WindForce 3X 450W Video Card - Newegg.com). In the latest vesion of MSI Afterburner, the power target would go up to 102%.

    The TDP of the card is 230W. But the cooler is rated for 450W, and the power supply 300W (PCI + 6 pin connecter + 8 pin connecter).

    So I modified the BIOS with Kepler Bios Tweaker and set the power limit to 133%, and flashed it. I ran a stress test and got the card to use almost the full 133%.

    But why would GIGABYTE set the limit at just 102%? Is setting it this high safe?

    I read that increasing the power limit is completely safe (unlike increasing the voltage), as long as the temperature is okay.

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    Default Re: GTX770 Power Limit

    Welcome to PureOC. Glad you stopped by. The problem is the answers you have received on the other forums about this same topic will likely be repeated here. You could have included some of the facts given to you so everyone doesn't repeat it and start from the beginning yet again. But hey that is just me........

    You will not get very far overclocking that GPU with a 300w PSU. GB suggests a 600w Minimum.
    You can play with the settings all you want but it will continue to perform lower then your lofty expectations because 300 watts wont cut it and you have a voltage locked rev. 1 770. Rev 2 (voltage unlock) has 2 x 8pin PCIe power connectors.
    Sorry to be the bearer of bad news. Stop flashing bios because it can not change a hardware lock.

    Are you testing for power draw at the wall or using some other means to verify your power usage? It cant possibly pull more then your PSU can actually output. Most reviews also have the 770 below 225. Here look. Power Consumption - The GeForce GTX 770 Review: Calling In A Hit On Radeon HD 7970? So you are well within the expected range.

    What kind of system are you using that only has a 300w psu? A HP or Dell box pc? If so I would stop benching that card until you get a new PSU. No games No benching. Your milking that PSU big time.
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    Default Re: GTX770 Power Limit

    You don't mention the other components but looking at your psu connectors it has the 6 pin and 8 pin available so it must be bigger than Cyber is postulating (guessing) When you don't give us the rest of the specifications it becomes difficult to help you.

    By design graphics cards tend to fall into one of two camps defined by the presence of 6 pin or 8 pin connectors so the physical safe limit for pcie x16 slots is 75 watts plus 75 watts for each 6 pin pcie connector plus 150 watts for every 8 pin connector so yes your card is built with one of each making it between 225 and 300watts by design which, if these connections are present on your psu, without any adapters, should not be an issue.

    see this power guide: http://www.pcisig.com/developers/mai...11c665ac770768

    The vast majority of folks will be happy with what they got from the factory and those settings have been proven by Gigabyte to be stable and they are also able to offer a warranty based on their research on this.

    Flashing the card voids the warranty so although you get better performance, Gigabyte get a get out of jail free card if your card fails in any way because they can see what you have done.

    Is it safe? probably. But if it were truly safe Gigabyte would set this at the factory and sell this much faster product at a premium. there is a good reason why they do not. choosing to do what you have done at the expense of your warranty is entirely up to you.

    On the voltage locked/unlocked front I know little or nothing so Cyber's comments likely apply.

    Some before and after benchmarks posted here would be useful for us all to compare too Fly..... the proof of the pudding is in the eating as they say.... I'd like to see what gains you made doing this.
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    Default Re: GTX770 Power Limit

    Quote Originally Posted by grumpydaddy View Post
    You don't mention the other components but looking at your psu connectors it has the 6 pin and 8 pin available so it must be bigger than Cyber is postulating (guessing) When you don't give us the rest of the specifications it becomes difficult to help you.

    By design graphics cards tend to fall into one of two camps defined by the presence of 6 pin or 8 pin connectors so the physical safe limit for pcie x16 slots is 75 watts plus 75 watts for each 6 pin pcie connector plus 150 watts for every 8 pin connector so yes your card is built with one of each making it between 225 and 300watts by design which, if these connections are present on your psu, without any adapters, should not be an issue.

    see this power guide: http://www.pcisig.com/developers/mai...11c665ac770768

    The vast majority of folks will be happy with what they got from the factory and those settings have been proven by Gigabyte to be stable and they are also able to offer a warranty based on their research on this.

    Flashing the card voids the warranty so although you get better performance, Gigabyte get a get out of jail free card if your card fails in any way because they can see what you have done.

    Is it safe? probably. But if it were truly safe Gigabyte would set this at the factory and sell this much faster product at a premium. there is a good reason why they do not. choosing to do what you have done at the expense of your warranty is entirely up to you.

    On the voltage locked/unlocked front I know little or nothing so Cyber's comments likely apply.

    Some before and after benchmarks posted here would be useful for us all to compare too Fly..... the proof of the pudding is in the eating as they say.... I'd like to see what gains you made doing this.

    How am I guessing? It was stated in his 2nd sentence. "The TDP of the card is 230W. But the cooler is rated for 450W, and the power supply 300W (PCI + 6 pin connecter + 8 pin connecter)." Also stated on the other 2 forums he ask the same questions on.

    I personally have never seen a PSU that small that has a 6 + 8 pin either. That is why I ask what kind of system he is using. An PC Oem would be the only tool to create a 300w PSU with 6+8pin pcie cables. I look forward to his reply.
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  5. #5
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    Default Re: GTX770 Power Limit

    We have to guess when we have no info....I'm guessing that if the psu has the 225w of pcie connections and you factor in the pcie slot too for a total of 300w, in order to run graphics at this level it must surely be a good deal bigger than 300w overall....... Or it is such a POS that the Manufacturer/Seller needs shooting. ...or as you put, it is tool ( I like that expression ). As you say the two figures are at odds with each other.

    flyoffacliff..... Name and model of psu please
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