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OC Tips Regarding Voltage (780 DCU II)

post #1 of 10
Thread Starter 
I need to check the OC limits of the GPU (in title) but can't go ahead until I find answers to the below queries:

1. Is it true that I only need to start incrementing the mem clock after finding a stable core clock?

2. The maximum voltage Asus 780 DCUII's stock bios allows is 1.212. Any special considerations before doing so other than temperatures?

3. A custom bios shall let me increment the voltage above 1.212 and will increase the temp limit to 95C. Does this mean the card cannot go above 80C at 1.212v?

4. Will increasing voltage impact only core clock, or mem clock too?

5. I'm sure I read somewhere that Precision X is better for OC'ing Kepler GPUs due to something something something. Is that correct? Because I prefer Afterburner.


Really appreciate any help/guidance.

Thanks very much.
post #2 of 10
Quote:
Originally Posted by n00bgamer View Post

I need to check the OC limits of the GPU (in title) but can't go ahead until I find answers to the below queries:

1. Is it true that I only need to start incrementing the mem clock after finding a stable core clock?



Really appreciate any help/guidance.

Thanks very much.
If you want to overclock your GPU use after burner and unlock it then overclock it on stock voltage, you can always enable the voltage control and over volt if you want to, but according to my experince voltage increace has a very low overclocking capability increace,
so i like overclocking my GPU on stock voltage and then clock down a few mhz when it is fully stable and then under volt to 0.8V running the overclock settings if it dosen't crash
Burning GPU in might be able to help you give it a extra mhz clock
Also according to my experince running your GPU cool will allow you to have a few MHZ higher core clock and RAM clock if both of them are chill under 50C
post #3 of 10
Thread Starter 
Quote:
Originally Posted by Iwamotto Tetsuz View Post

If you want to overclock your GPU use after burner and unlock it then overclock it on stock voltage, you can always enable the voltage control and over volt if you want to

Thanks for your response.

So by overclocking on stock voltage, do you mean 1.175 or the maximum allowed by stock bios (1.212)?

And what if GPU-Z is showing "IDLE" VRM temps as Min= -109C and Max= 208C at default 1.175v? Are these really correct readings? And Is it safe to increase the voltage to 1.212 in these circumstances?
post #4 of 10
Quote:
Originally Posted by n00bgamer View Post

Thanks for your response.

So by overclocking on stock voltage, do you mean 1.175 or the maximum allowed by stock bios (1.212)?

And what if GPU-Z is showing "IDLE" VRM temps as Min= -109C and Max= 208C at default 1.175v? Are these really correct readings? And Is it safe to increase the voltage to 1.212 in these circumstances?
Don't care about it and stress it and clock the vrm will never blow up according to my experience
post #5 of 10
Thread Starter 
Thanks for you help mate.
post #6 of 10
Quote:
Originally Posted by n00bgamer View Post

Thanks for you help mate.
It will be nice to see some clocks on screen shot
after burner or what ever
if you have time to upload some for us on your top clocks thumb.gif
Also you have simple one click unlock funtion on voltage and clocks if you are using after burner 3.3 or higher thumb.gif

Which I had tried with my HD7850
Edited by Iwamotto Tetsuz - 1/14/15 at 11:50pm
post #7 of 10
Please, do not follow anything this guy says, his "advice" is almost always dangerous, and he has no experience with the things he is "advising" on (read: instructing them to damage or explode).

I have little experience with the 780s as I quickly sold in favor of a trio of 780Ti Classy Kingpins, but I do know that you will not find a better source than in tthe 780 Owner's Club thread for ACTUAL information, instruction, etc.

Please, please, please, PLEASE go there, and scrub the memory of the rest of this thread from your brain with bleach/TCP/lye....
   
Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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post #8 of 10
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Don't care about it and stress it and clock the vrm will never blow up according to my experience

Do not misinform other uses!!!
Quote:
Originally Posted by nleksan View Post

Please, do not follow anything this guy says, his "advice" is almost always dangerous, and he has no experience with the things he is "advising" on (read: instructing them to damage or explode).

I have little experience with the 780s as I quickly sold in favor of a trio of 780Ti Classy Kingpins, but I do know that you will not find a better source than in tthe 780 Owner's Club thread for ACTUAL information, instruction, etc.

Please, please, please, PLEASE go there, and scrub the memory of the rest of this thread from your brain with bleach/TCP/lye....
Thank you for guiding the OP in the right direction.
post #9 of 10
Thread Starter 
Hi,

I'm sorry I know it's an old thread of mine but since I'm not a regular here, came back to post another thread and saw an update in this thread.

Thanks very much nleksan and ALT F4 for your great concern about other forum members.

Secondly, I hope this help others. Fortunately I never touched the voltage anyway, in whatever OC testing I did on that 780 which has long been replaced with a 980. My tests never went more than ~5-10% hike on core/memory, which supposedly is the very much recommended settings for amateurs like me. And I was happy with whatever minimal performance gains I got out from it.
post #10 of 10
Quote:
Originally Posted by n00bgamer View Post

Hi,

I'm sorry I know it's an old thread of mine but since I'm not a regular here, came back to post another thread and saw an update in this thread.

Thanks very much nleksan and ALT F4 for your great concern about other forum members.

Secondly, I hope this help others. Fortunately I never touched the voltage anyway, in whatever OC testing I did on that 780 which has long been replaced with a 980. My tests never went more than ~5-10% hike on core/memory, which supposedly is the very much recommended settings for amateurs like me. And I was happy with whatever minimal performance gains I got out from it.
I'd wouldn't touch voltages on GPU if the temps are high 60or more
(Temps and voltage percentage = Clock gain, lower temps and higher volts means higherclock)

Since overvolting can give only tiny increace in MHZ
I had 3 hd7850 that can do at least 1000MHZ and undervolt to 0.8V and fully stress stable(860stock)
Unless your gains in clocks are high or you have watercooling I don't really recomend overvolting any gpu at all
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