My Rig,
sli gtx 980ti gigabyte windforce (Boost: 1241 MHz / Base: 1152 MHz) & evga SC ( not overclocked ) (Base Clock: 1102 MHz / Boost Clock: 1190 MHz )
CPU- i7 3960x oc( 4.7ghz)
Motherboard- asus rampage iv latest bios
RAM- 4x8gb 2400mhz ram corsair platinum
PSU- Evga Supernova 1500
Cooling- custom cooling for cpu
Monitor- Asus rog swift gsync 144hz
 
lately i wanted to overclock my cpu/gpu to get performance increase as am not happy with the performance i see in most games on my gaming monitor or on my 4k tv,
so i wanted to overclock and i did my cpu i overclocked it to 4.7ghz but yet i didnt see any performance increase in either benchmark or games in 3dmark what was different is the physics score by 2k thats it,
now i have been trying to overclock my gpu and my gpu is the issue as u see i have 2 different gpu ref so different clock core i started to overclock the core on the first one slowly i started with +100mhz core and i did benchmark when i open gpuz or nvidia inspector or even 3dmark advanced i see my system information and i see my gpu has the extra +100mhz i put on the core but when i run stress test or benchmark or any game on max settings and check with osd on and gpuz sensors i see max i get is 1240mhz on core which means the overclock not taking the effect something is wrong,
i have been trying all day to get it working i did raise by 10mhz core to see if any difference but nothing and i did everything power limit to the max volt to the max everything but stil nothing i cant see more than 1240mhz on core and on games or benchmark not all the time at 1240mhz mostly at default 1101mhz.
 
i have the latest driver installed 368.39, i even tried the latest hotfix but nothing also.
any suggestions or any idea what would be the problem ?

maybe i misunderstood (and this is all irrelevant), but i think you said you have an sli setup, and have tried just overclocking 1 card (was it the gigabyte or evga?). if you're in sli, the gpu's will limit themselves to the slowest clock speed amongst the two cards - might that be the simple problem?
regardless, depending on the effort you want to put forth, it might be useful to overclock one card at a time (not in SLI) to test the limits of the individual cards. once you find the limit of each, you can choose the appropriate clock speed that works for both.

yatz10
maybe i misunderstood (and this is all irrelevant), but i think you said you have an sli setup, and have tried just overclocking 1 card (was it the gigabyte or evga?). if you're in sli, the gpu's will limit themselves to the slowest clock speed amongst the two cards - might that be the simple problem?
regardless, depending on the effort you want to put forth, it might be useful to overclock one card at a time (not in SLI) to test the limits of the individual cards. once you find the limit of each, you can choose the appropriate clock speed that works for both.

This may be the issue, however, msi afterburner/precision x link the cards by default.

cincity003
how do i unlink them ? plus if i want to overclock each card alone do i have to remove it from the case and do the overclocking or i can turn off a setting and do the overclocking ?

Inside afterburner...
 

So the overclock is now working?

cincity003
yes i did remove the evga sc and left the gigabyte on the pc and i did the overclock and it seems to be working well atm, so what do i do ??
 
overclock one card then remove it and overclock the 2nd to be exact the same core and memory on both cards and then use both ?

No. Both cards need to be in the system. Make sure both cards are linked inside afterburner and then both cards will overclock at the same time. Sli needs to be enabled inside the nvidia control panel too.

cincity003
but i tried that before and it did not work it wasnt taking effect, so how do i do it ? should i overclock the one with lowest core clock or what :S as i said both cards have diff core clock base and boost

If it wasn't working then you need to do what I suggested in post #2 then report back if you're still having a problem or not.

cincity003
i did that already, and overclocking wasnt taking effect in games or benchmark but when i removed the 2nd card ( the lowest clock one ) overclock is taking effect at this moment but when i place the 2nd card how do i overclock it :S.

Then you should try un-linking the cards and overclocking them individually. Sli needs to be enabled when doing it. Both cards need to be in the system too.

i did that also and it was the same not taking a effect also ? can u tell me how to unlink them incase am doing it wrong but i guess its on msi afterburner settings and unchecked the synchronize settings for similar graphics processors

didnt try, i tried to overclock the gigabyte one and when i saw its not taking effect i tried taking the evga off and tested without it and it was taking effect,
 
should i put the evga back on and enable sli and try to overclock the evga first ?

whoah, a lot of conversation went on while i was typing my post! follow sajin's advice first (and watch the video arestavo suggested:)
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hey, at least it's encouraging that when tested separately the overclock worked on the gigabyte.
to use the cards overclocked in sli you need have both in together and also re-apply the desired overclock in PX or Afterburner. so what i'd do i suppose:
- put them both back in
- it's often recommended to overclock them to the same clock frequency speed; so since they're different models with different core clocks, you might get the most straightforward understanding by unlinking them (click the little chain like thingy in PX) and setting the overclock parameters for each separately.
- overclock both separately (e.g. to base of of 1200ish for both, so +48 on gigabyte and +98 on evga)
if you still see no benefit, then you've confirmed something odd might be happening.
if it does work, you can either just start increment-ing them up to find the max stable (keep both in - low effort), or take one out and find the limits separately (higher effort)
there are some good videos out there about overclocking in SLI - to get the basics, it's probably way easier to watch those than read short blurbs:)

Prerequisites to overclocking in SLI:
 
#1 Both cards need to be installed into the system.
#2 SLI must be enabled inside the nvidia control panel.
#3 Cards must be linked and not un-linked inside msi afterburner. Cards a linked by default, so unless you un-linked the cards they should be linked already.
 
If you have everything set correctly then overclocking inside msi afterburner should work as follows... you adjust one card and both cards are set to the same speed.

If it's not working like I just said then your system has a software issue. Uninstalling/reinstalling afterburner should fix the issue. If uninstalling/reinstalling afterburner doesn't fix the problem you should try a different overclocking utility after uninstalling afterburner and rebooting the computer. If no overclocking utilities are working for you then you may need to re-install windows.

yah, what do i do to lower the evga sc temp ? its getting very hot yea 

i guess my evga gpu is throtting when temp 80c+ :S, i didnt touch anything i only added 100 to the core to both cards and increased temp to 91c didnt touch power limit or volt or anything, what do i do ?