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Titan vs 780: Stock BIOS reference card OC battle - Page 3

post #21 of 27
Thread Starter 
I'm bumping this one more time because I have some further data on my 780 and how it actually compares to my previous Titan. I have yet to see it crash, so 1202MHz/3206MHz seems very stable but having played some more Sleeping Dogs I've come to realize that the power limit is still holding me back. Here's a good 30+ minutes of gameplay at 3840x2160 downsampled:



This shows the worst case scenario, nothing else seems to hit the power limit quite like Sleeping Dogs. In a really intense scene, even the 780 hugs the power limit at 104-106%. This results in throttling down to 1150MHz at the lowest but mainly the clocks are 1189-1202MHz. Still, it's throttling so I decided to give stock voltage another go. I dropped the clocks to 1176/3206MHz with voltage at 1.15V and this is what I've found:



The clock speed graph looks like it's pegged but if you look at the voltage graph, there's those tiny notches down. That's where the card throttles down one voltage bin and one clock bin. What's remarkable is that by lowering my voltage and core clocks, I've actually achieved higher clocks for the worst case scenario: with extra voltage I got drops down to 1150MHz but with stock voltage I can't get it below 1163MHz no matter what I try.

As a side note, there's something funny about the power limit. Look at those two power limit reason flag graphs, that is the "0 or 1" power limit graphs. With higher voltage, there is less of those "1"s in there than with stock voltage. So it seems to hit the power limit more consistently with a lower voltage, but most of those hits seem "soft" enough to not cause a drop in either voltage or clocks.

Now, let's make a worst case scenario comparison between my Titan and 780. At the very worst, my Titan ran Sleeping Dogs at 1006/3006MHz whereas my 780 does 1163/3206MHz. Granted, I didn't go to such lengths to see if I could make the Titan stay higher, but seeing how it was hitting the power limit way harder, I don't think there was much to be done. So Titan has 16.7% more shaders, but in this case it could only run core clocks of 13.5% (1-1006/1163) lower than 780. That's practically a draw in shader power, but the 780 has that little bit more power limit headroom left for memory OC.

Where does that leave me? It leaves me with the exact same performance, dictated by the same power limit for both cards. I suppose my hypothesis in the first post was just about correct.
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post #22 of 27
Quote:
Originally Posted by Kaldari View Post

No amount of lube is going to make that work.

Some things are better left un-said. haha.
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post #23 of 27
Have you tried the custom bios from techinferno? It raises power limit to 350W and disables Turbo 2.0 so the clock you set is the clock you get. All downclocking for 2D video still works perfect. Will increse performance significantly in games like sleeping dogs.

My Valley score at 1.16v 1202Mhz Core:
FPS: 71.5 Score: 2992 Min FPS: 35.0 Max FPS: 135.1
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post #24 of 27
Thread Starter 
Quote:
Originally Posted by jasjeet View Post

Have you tried the custom bios from techinferno? It raises power limit to 350W and disables Turbo 2.0 so the clock you set is the clock you get. All downclocking for 2D video still works perfect. Will increse performance significantly in games like sleeping dogs.

My Valley score at 1.16v 1202Mhz Core:
FPS: 71.5 Score: 2992 Min FPS: 35.0 Max FPS: 135.1

I have not and most likely will not. It is tempting, but the power limit isn't quite as suffocating with 780 as it is with Titan. Sleeping Dogs is the only game that I've seen hitting it, other than that I've only seen it in 3DMark11.

I'm quite happy with the power limit of this 780, whereas my Titan was a bit frustrating.

Nice score, btw. I, too, broke into 70's with 1202/3206 and no tweaking. Might give it a proper benchmark run some day, maybe try for 3000 score but right now I'm just enjoying my games. biggrin.gif
Edited by specopsFI - 6/20/13 at 12:11pm
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post #25 of 27
Quote:
Originally Posted by ahnafakeef View Post

Any way to get a stable clock like that on a Titan? I'll be more than happy even at 1150MHz core if it doesnt throttle at all. Raised the voltage from 1.162 to 1.175 to 1.186 and its still throttling.

Also, what can I do to get 1202MHz stable? At 1.212v, 1202MHz core clock crashed in TR every 15 mins or so. Thats when I gave up and settled for a meager 1150MHz and havent tried using 1202 other than while benching Valley.

I really hope that your expertise will help me solve this issue. Nice write-up btw! thumb.gif
I f you read the long post of
specopsFI
you would see that the limit of the titan is the power limit wink.gif
so with a custom bios you can overpass that.
check on google or on this thread on how to change to another one
post #26 of 27
This test is only relevant if you don't fix Titan's BIOS issues. Once you flash to the engineering BIOS the power limit is no longer a factor and the Titan remains easily 5-10% faster than the 780 at all times. But certainly if you don't want to flash or you really just want the best card for the money you should go with a 780. Titan is for those of us that aren't afraid to push hardware and need the absolute best in terms of benchmarking (or need the 6GB memory buffer for surround or 4k resolutions)....
post #27 of 27
Thread Starter 
Quote:
Originally Posted by Majin SSJ Eric View Post

This test is only relevant if you don't fix Titan's BIOS issues. Once you flash to the engineering BIOS the power limit is no longer a factor and the Titan remains easily 5-10% faster than the 780 at all times. But certainly if you don't want to flash or you really just want the best card for the money you should go with a 780. Titan is for those of us that aren't afraid to push hardware and need the absolute best in terms of benchmarking (or need the 6GB memory buffer for surround or 4k resolutions)....

Very true, hence the headline. Flashing the BIOS is really simple and gives the Titan a real change to stretch its legs. But there is still a risk involved and personally I didn't feel like going there with a card this expensive. I've already had a card dying on me with a custom BIOS in it and no way to flash it back to stock.

The 780 has less to gain from custom BIOS, but a high leakage chip will still get a significant boost not being throttled by hitting the power limit even with the extra voltage bin or two.
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