780 TI SLI under performing or bottlenecking?

TheNaitsyrk · Sep 17, 2014

I stress tested 780 TI in SLI in Heaven 3.0 and Heaven 4.0 benchmark.
I overclocked both ZOTAC 780 TI OC in SLI to 1080 and I kept 1750 memory as is.

Scores:
Heaven 4.0 - 3050
Heaven 3.0 - 3780

According to this, my SLI is under performing by about 700-800 score points.
Look at the table named "Multi GPU" and the 1st score. http://www.techpowerup.com/forums/threads/unigine-heaven-4-0-benchmark-scores.190386/

CPU is definitely not bottlenecking since it's 4790K with 4.0 Ghz stock and 4.4 Ghz boost.

Could it be drivers fault? Using 340.52 (newest ones), or maybe BIOS or Motherboard?

RobCrezz · Sep 17, 2014

Can you try unigine valley 1.0, Extreme HD preset?

TheNaitsyrk · Sep 17, 2014

Will do let me download it 1st and I'll post results.

TheNaitsyrk · Sep 17, 2014

Also, one person from this thread managed to get 1100 OC whereas I'm struggling to get 1085 without a black screen http://www.tomshardware.co.uk/answers/id-2301951/780ti-overclocking-missing.html#14192232

What about Skynet bios? Does it really help?

JimF_35 · Sep 17, 2014

Those guys got those scores by flashing their Firmware. If you want scores like that you might have to do the same. Then you will be able to raise your voltage to 1.212 V so you can get those huge 1124 Clock speeds. Be aware no two GPUs are alike and it could just be that they got a good GPU that allows them to overclock that high. Also I would not do this unless you have liquid cooling. At those volts your fans just will not cut it.

TheNaitsyrk · Sep 17, 2014

What do you mean by "Flashing firmware" (I'm new to overclocking etc). I knew they probably raised voltage, but I wasn't sure. Well, they're using 780 TI in SLI just like me.

azzazel_99 · Sep 17, 2014

On my evga cards I can get to 1300mhz clock but I have the skyn3t bios

JimF_35 · Sep 17, 2014

TheNaitsyrk :

http://www.youtube.com/watch?v=66AL6UCMuF8
http://www.youtube.com/watch?v=LUJN0ubWKvE

Again before you do this make sure you have aftermarket cooling on your GPU.

TheNaitsyrk · Sep 17, 2014

Is there a way to improve the score slightly without flashing firmware? Azzazel_99, I'm using 80.80.34.00.20 (P2083-0030) BIOS on Gigabyte GA-Z87X-OC FORCE mobo.

JimF_35 · Sep 17, 2014

TheNaitsyrk :

You can raise your voltage to max and see how high you can get your clock. IF you hit the wall then it is the highest you can get.

This is also the number one complaint about the GTX 780, 780ti and Titans is that the bios does not allow you to push your system past it breaking point.

TheNaitsyrk · Sep 17, 2014

Also, I don't want to void my warranty by raising voltages, so I guess there is no other way. Is the Skynet bios really that good? Should I update it or leave it as is?

JimF_35 · Sep 17, 2014

TheNaitsyrk :

It use to be any over clocking will void your warrantee but today you can over clock all you want and the warrantee is usually still good. If you flash your BIOs though, I am not sure they will honor it. You may ask NVidia first.

TheNaitsyrk · Sep 17, 2014

I'm almost certainly sure that if I modify something in BIOS or BIOS itself, then they'll know about it. If I use software, there's no way they will find out. So I guess 1080 core clock is all there is for me, since it doesn't let me push it any further. I might try 1090 and 1100 later on without raising memory clock.

azzazel_99 · Sep 17, 2014

My evga cards are covered even with custom bios. As a mattr of fact they released a bios update in one of their forums that raised the voltage capability and allowed higher clocks. I run the classified models though so I have dual bios on each card and the 2nd (ln2) bios is designed for overclocking. I also hit my 1300mhz on air with no temp problems.

TheNaitsyrk · Sep 17, 2014

I'd have to call ZOTAC to make sure that I'll still be covered in case something happens + I can't tell them I'm overclocking. ('cause I own 2x ZOTAC 780 TI OC versions) I only have air cooling (about 7 fans) and I can also enable turbo if needed on 140mm one.

TheNaitsyrk · Sep 17, 2014

Also, just to clarify.... 1080 core clock speed on my 780 TI in SLI and 3050 score in Heaven 4.0 with maxed out settings on 1920x1080 is normal? There's no bottle necking? I just can't push it further because BIOS and -4 -5 -6 protection by NVIDIA doesn't let me do it? If yes, topic is solved.

azzazel_99 · Sep 17, 2014

Correct

TheNaitsyrk · Sep 17, 2014

Okay thank you very much, card is clocking at 1190 (it can be seen in the sensors in GPU-Z or Zotac Firestorm) anyway for some reason (when overclocked to 1080 without raising voltage and memory clock which is fine), however if ZOTAC lets me try the Skynet BIOS, then I'll definitely do it. Not sure if air cooling will be enough but I'll make sure to ask. Thanks you!

Thread solved.

780 TI SLI under performing or bottlenecking?

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