GPU Overclocking Help

qwertyexp

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May 8, 2015
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Before anyone asks, my build: http://pcpartpicker.com/user/Exp/saved/3FQcCJ
And a Zotac GeForce GTX 750 Ti. I am using MSI Afterburner, Heaven Benchmark, and this is my first time overclocking. Yes, I have updated my graphics drivers.

I am currently overclocking the above graphics card, and even though I have read many guides, I still have many unanswered questions. I am following this guide (http://lifehacker.com/how-to-overclock-your-video-card-and-boost-your-gaming-30799346). First of all, how can I find "safe" voltages for my GPU? I've searched far and wide, and can't find any clear answer. The best I've come up with is only going +0.5-1 higher than stock, but still, I feel like this would be different depending on the GPU. And this leads me to my second question, is it safe to increase the voltage of my GPU if it draws power from the motherboard? I can't find enough info on the motherboard on whether it can handle it or not, so I was wondering if this was unsafe for it, or if I could give it a try.

I also have a few questions on artifacting and instability. Exactly how obvious are artifacts, and will the presence of artifacts damage my GPU over time? So far I have only encountered an unusual blue streak next to the flag on the castle, which I'm sure is an example of one, and the rainbow-colored circles that happen when the camera is facing the sun or is getting a reflection of the sun seem to be more prominent. I can post pictures if needed.

That's all I can think of for now, thank you very much for your patience, and please be as descriptive as possible in your responses.
 

Greybush

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Jun 16, 2013
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To answer your first and second question, Nvidia locks the voltage at a level they consider safe, so just as long as you are not using a modded OC utility you will never be able to push your voltages over a limit that Nvidia doesn't deem safe. So as long as your temps are below 90c, which is the max safe range determined by Nvidia, you are good to go.

For your third question, great question btw, your motherboard has a molex connector above the pci and pci-e slots, this connector helps provide additional power to the pci and pci-e slots. So if your graphics card does end up needing more power, the card will draw the power from the molex connector instead of the 24 pin connector.

And for your last question, you will definitely notice artifacts. Artifacts usually tend to show up as line shooting randomly across your screen or random colors and shapes popping out. When you have reached instability, your graphics driver will crash and that is usually caused by an unstable core clock. If your computer starts to freeze or your screen turns a solid color that is usually cause by an unstable memory clock.
 

qwertyexp

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May 8, 2015
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Does the fact that the card is manufactured by Zotac change its ability to lock the voltage?