Overclocking EVGA GTX 780TI (water)

tomnewdelhi

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Hey,

Before i start, my specs are:

CPU: I5 3570K overclocked to 4.1ghz (stable)
Mobo: GA Z77X - UD5H
RAM: Corsair Vengence 16Gb X2 8Gb
GPU: EVGA GTX780TI

This system is on a single loop with GPU and CPU cooled by 2 360 rads.

Ive just recently brought the waterblock for the GPU and installed it, Now comes the overclocking part.

GPU sits idle now at 22 degrees.

Ive been trying to use MSI afterburner to up the GPU and using Valley Benchmark 1.0 to monitor progress, GPUZ in the back to also monitor temps etc.

So far ive not touched the voltages.

and ive managed to up the core and memory by 150Mhz before crashes. Anything above this will cause the program to crash with an error message relating to D3d initialisation.
(GPU temp has not gone about 30 at this point so i know its not overheating)


I assuming this is due to the voltage not being enough when i try to go beyond 200Mhz?

CPU overclocking i seem to have a handle on but GPU im not so sure on.

Can anyone offer me some advice please?

Cheers

Tom
 
go over to ocn and get a custom bios from team skynet. you will need one to go past 1.212v. you will likely end up running a 1.25-1.28v vcore and whatever core frequency that allows you, probably 1375-1500mhz depending on your chip.

http://www.overclock.net/t/1438886/official-nvidia-gtx-780-ti-owners-club

yes you need more voltage. for now you can slide the voltage all the way up in msi afterburner and then keep adding core frequency. you will need to raise the power slider up to 110%. though you are likely going to start throttling because of your power target limitations on the stock bios. on top of that your core will become vcore starved long before you hit a temperature limit due to your extreme cooling. a custom bios will disable stupid boost mode, allow up to a 200% power target, and allow i believe up to at least 1.30v on the core, if not much higher.
 

tomnewdelhi

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Hey Nikoli thanks for the reply, Ive got the extra roms and downloaded them, before i flash to the skynet one, my card can already go up to 1.3v with AB and precision X but the power is only max setting of 106%

Ive left the mem clocks alone and just tweaked the core. ive been running The valley on UltraHD mode to bench. ive gone up but anything over +300 on the core and i start to get a lower benchmark (this is raising the voltage up to 1.3 in places.) i still cant go beyond +300mhz on the core clock.

Temp wise it hasnt passed 32 degrees so thats no issue.

Is there something im overlooking or is this just my card not being able to OC very well? or do i need to flash the bios to get a higher power setting?
 

tomnewdelhi

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Ive flashed my card to a skynet one, im able to power to 200% and 1.3v.

Ive done benchmarks and a furburn,

my overclock here is:

Power Limit 200%
temp 95
core +150
Memory +450

Voltage is on Auto.


Ive run valley benchmark on Ultra HD and stock score was 2831 with the overclock i got 3144. - this run for about 2 hours with no crash.

Furburn for 4 hours tops out at 39 degrees.

If i up the core or memory evey by 10 i get crashes.

Im guessing that this is the limit of my card, Im still not sure about voltages. Any advice will help.

Cheers
Tom


 
extreme hd valley
i5-2500k @ 4.7ghz ---- evga 780 classified @ 1350mhz core / 1650mhz mem
score 3349
fps 80.0


here is my score and clocks. i think i was using a 118% power target. you need to add more voltage to the core. you should be able to get up into at least the higher 1300s mhz on the core frequency. at that speed your score should be valley score should be 3600ish.
 

tomnewdelhi

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hey, that overclock i mentioned before isnt stable when i run games like GTA, i get an error about D3d initialising and restarting my PC after about 10 minutes.

My asic is 74.7%

Does a Ti SC overclock as good as it seems even if i up the voltage to the max 1.3 i still get the crashes :(
I have the most recent gtx drivers too.