Problem in overclocking 2080 Ti

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rohitgupta1975

rohitgupta1975

Aug 29, 2018
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I am not able to get beyond 50MHz increase for the core clock on my Zotac 2080 Ti AMP! even after giving full headroom for core voltage and power. Used Precison X1 and Afterburner . Temperatures stays around 70C. I have seen people getting 150 to 200MHz overclock. Even OC Scanning just suggests 61MHz more. What is wrong with my GPU? What should I be doing to get higher overclock on this stock GPU (air-cooled)?
 
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rohitgupta1975

rohitgupta1975

Aug 29, 2018
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PSU: Corsair HX1000i . Power target: Max allowed on this card. Max temperature headroom (though it never reaches that). No GPU memory clock overclocking yet.

I do want to mention that I connected the two 8-pin power sockets on the card through a single 8-pin connector from the PSU (the cable is a splitter). I don't think that should limit the power available to the card (hopefully).
 
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rohitgupta1975

rohitgupta1975

Aug 29, 2018
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I will do this as soon as I reach home. I hope it's simply that problem. But I am still curious: If the overclocking software shows that the card is using 110% to 115% of its TDP during benchmarking (it keeps fluctuating), then it MUST be getting that power from the PSU, right? Then the splitter may not be limiting the current, right?
 
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Lucky_SLS

Lucky_SLS

Glorious
Dec 16, 2016
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2 8 pins can give 375w of total power.

1 8 pin gives 150w max. The mobo pcie connection gives 75w.

The 2080ti reference design is 250w tdp. Overclocking can easily take 350-400w.

But mind you, the auto oc scan stresses the gpu to find max stability at a given oc. Gaming loads for that particular oc will be typically 50% of that load and increases depending on that particular scene graphics rendering.
 
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rohitgupta1975

rohitgupta1975

Aug 29, 2018
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Ok. That single 8-pin power socket on the PSU is only delivering 150W max. And the mobo another 75W max. So that's only 225W max for the GPU though it actually needs much more during benchmarking.

Noted your point about load during actual gaming.

 
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anthonyajax1995

Sep 10, 2018
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Wait, I'm currently using 1 PCI-e cable that goes from 1 8 slot PCIe to 2 6/8 slots PCIe's. (2 x male 6+2 pin to male 8 pin)

Like this: https://imgur.com/a/5beNyMP
Came with this PSU: http://www2.seasonic.com/product/m12ii-750-evo/

Are you saying the power is being split between those 2? So I should use 2 x8 pins on the PSU, only using 1 of the 6/8 pins on each?

 
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Lucky_SLS

Lucky_SLS

Glorious
Dec 16, 2016
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^ but like said, a single 8 pin will give 150w max (depends on the psu, the hx1000i for example won't have any issues, but lower capacity like a 450w may not give 150w)

So for a gtx 1080 class and below, a single 8 pin and pcie's 75w will give enough juice. Higher wattage cards like the Vega 64 and 2080ti will suffer.
 
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rohitgupta1975

rohitgupta1975

Aug 29, 2018
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I have now two separate cables from PSU to the GPU (each Y-cable has an 8-pin on one end and (6+2)-pin on the other. Plus it has another (6+2)-pin connector that I have not connected.. So TWO such cables for a card.). But it didn't help me with the issue. I updated my BIOS. No effect. I am not near the thermal limit or temperature limit. I don't know why my system crashes (Black screen. I have to hard-reboot) as soon as I push the core clock above 50MHz during a Heaven (4K) benchmark run.
 
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micvperalta

Oct 19, 2018
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btw, default bios gives me 290, evga bios 330. i managed to improve oc by 60mhz using Evga bios. but a game that utilizes your card like Hunt:showdown, card goes down to 1920. Otherwise, it will hit 2130.

still it can't hold the clock when on peak.
 
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rohitgupta1975

rohitgupta1975

Aug 29, 2018
33
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@micvperalta: I have an ASUS mobo (ROG Rampage V Ed 10). It DOES have a switch for BIOS1 (default, I am using that) and BIOS2 (never used). Is that BIOS2 equivalent to your mobo's EVGA bios? I can try switching to BIOS2 and see if it improves OC beyond 50MHz.

Did you run Heaven (4K) (Extreme settings) after you did 60MHz OC and your GPU did not crash?

@Lucky_SLS: I will check the power draw at 50MHz OC with and without two cables. But if it's unable to go beyond 50MHz even with two cables, then power draw may not be the issue.



Do you think if the GPU is made cooler (by watercooling) it will be able to OC to higher core frequencies, everything else remaining the same?
 
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Lucky_SLS

Lucky_SLS

Glorious
Dec 16, 2016
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There is binning process involved in gpu as well as cpu. That's y evga has those DT models which are poor overclockers.

I expected the Zotac gaming to be atleast a bit higher tier binned than their reference/blower style cards. But that may not be the case if you are unlucky.

First confirm if you have lost in the Silicon lottery. There is no point in spending more cash on a gpu die which is poorly binned / can't oc.
 
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micvperalta

Oct 19, 2018
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@rohitgupta1975: i don't mean the MOBO bios but the Vcard bios. Im using EVGA's which is 330W compared to 300W. I can clock 70/750 which translates to 1930-1980 @ 97% utilization.
 
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