780 Classified overclocking.

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Hello Tom's Hardware. I am currently working on overclocking my 780 Classified and am having hang ups at about 1200 Mhz. I know my card should be capable of much more and I was hoping somebody would have some current info for these cards. I have been using precision X which sounds like from my research could be my problem. I am on my LN2 BIOS and running at 1202 Mhz boosted. If I try to push further (regardless of raising voltage) I end up with crashes. I am noticing in my GPUz monitors that my voltage will drop to zero out of nowhere and BAM - black screen and auto reset to default. My temps seem fine, I have never seen my temp go over 80 C and that was when I was benchmarking around 1350 Mhz, which never came close to stable in games. Using Heaven and Valley to benchmark. At 1254 Mhz my temp was never going over 73C and I had my voltage up to 1.212 but during games I would still get the random voltage drop to zero which would black screen me again. Could it be possible that my PSU is giving me the voltage drop randomly? I am pretty new to GPU OC but I did a lot of research for a few weeks before attempting overclocks. Any advice would be great!

 

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So, I have no idea what happened, but my rig won't boot. My cpu light, then memory light, then GPU light come on as normal on my mobo, then my boot light comes on for a second and then the machine just shuts down. Not sure if it is an issue with my GPU or my motherboard. I switched back to my LN1 BIOS on the GPU for now which is at stock settings. If anyone has any idea where I should start with figuring it out, let me know. I am at a loss as of now. Thanks!

 

[nikoli707]

sounds like it could be a motherboard issue. find the reset jumper on the motherboard then reboot.

 

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Wife left the room door open and the cat(which is banned from the bedroom) got in and stuck her paws in my case. Pulled some fan wires out and most importantly unplugged my pump in my CPU cooler. So my CPU was hitting crash temp by the time I was getting to Boot device during POST, and shutting down to avoid damage. Which thank god my system is set up that way. CPU doesn't appear to be damaged and everything seems to be running fine again. Haha! Friggin animals!

 

[nikoli707]

Wife left the room door open and the cat(which is banned from the bedroom) got in and stuck her paws in my case. Pulled some fan wires out and most importantly unplugged my pump in my CPU cooler. So my CPU was hitting crash temp by the time I was getting to Boot device during POST, and shutting down to avoid damage. Which thank god my system is set up that way. CPU doesn't appear to be damaged and everything seems to be running fine again. Haha! Friggin animals!

ouch. cat, you are banned. yes, its very doubtful any real damage was done, protection is there for a reason. i do believe if the mobo receives no return signal from the pwm fan, it can "stop" all functions as protection so you might not even hit a high temp. anyways if it was a high temp, it was at a low core voltage and not sustained anywhere near long enough for electromigration to set in.

 

[Globber]

Everything is running pretty smooth so far. Waiting for my 4th monitor to complete my setup. The 780 is cranking out some power now! Running Lichdom:Battlemage on maxed settings on 144hz and it looks awesome! Framerate is staying over 70, temp hits max of 85C though. But so far seems nice. Seems like Metro:Last Light and Battlemage are pretty demanding on max settings to test overclocking. Benchmarked on Heaven and Valley up 1342 Mhz but not very stable.

So now I am curious about the other 2 sliders on my Classified Controller. FBVDD and PEXVDD. What do they do? What are they for? I most likely would not touch them until I get a good EKBlock and loop set up. But I still would like to know what they are for. I am familiar with the PWM freq. which I have set to 312 and sometimes 400 Khz(depends on voltage demands of my games being played). Thoughts?

 

[nikoli707]

i wouldn't let it hold 85c.... kept at at 80c and let the stock temp target of 82c stay the same, unless your doing quick benchmarking and letting it cool down.

frame buffer voltage, and pciexpress voltage. you shouldn't need to play around with these under stock air. thouhg the pwm freq moved up a little can help with stability but your voltage under load will raise slightly. though chil8318 controller doesn't allow much vdroop on the cards anyways, or unless your at an exotic voltage. you likely dont need it unless your past the normal 1.212 limit. i would imagine if your at 1.30v under water, you would want to test pwm freq settings by using a multimeter on the card to see what the actual voltage is vs what the software is telling you.

 

[Globber]

Yes, I know that 85 is too high. It was only that high for a night when it was around 95F in my house. I knew temps get high that night. I haven't seen it go over 78C since. However, my monitor configuration is not working as expected. Here is how I had my monitors set up:
1 ASUS VE248Q - Up Top Center - DVI-I
1 ASUS VE248Q - Left Monitor - HDMI
1 ASUS VG248QE - Center Main Monitor - Dual Link DVI-D
1 ASUS VE248Q - Right Monitor - DisplayPort

Now, what I wanted to do was swap the 2 center monitors, The VG248QE to move up and stand alone and the 3 VE248Q monitors all to be side by side in landscape mode on NVidia surround. I wanted the VG248QE to be set at 144Hz and the 3 VE248Q monitors to be set as one monitor at 60Hz. So I hooked it up this way and it would not work. Is this just not possible? Would I be able to accomplish this once I get my 2nd GPU for SLI mode? I could not seem to get my configuration to work with three monitors in surround without using both DVI connections. Is there a way to change it so that the DVI-D connection does not have to be used in surround?

Second question, I know this has been discussed but it seems like info is not so straight forward. My mobo can handle 2 way SLI at x16/x16 or 3 way at x16/x8/x8. Is it worth getting 3 way SLI if it means dropping down to x8? Or is it better to just run with 2 way SLI at x16/x16? Ultimately I would like to be running 3 VG248QE's in landscape mode at 144Hz and I am wondering what the minimum requirements would be for this to be able to handle everything maxed at 144Hz?

Thanks! Always loving talking computers!
-Globbah