No SLI option in Nvidia Control Panel

[MrR3N3]

I recently received a new GPU which is a GTX 760 2gb. I decided to install this second card and run it in SLI with my current GPU which is a GTX 760 4gb. After installing the 2nd card I went to the Nvidia control panel but the activate SLI option was not available to me even though both cards are detected by the Nvidia control panel. I am reading mixed answers to this problem, some saying different Vram will not work in SLI, others saying that it will work on the lowest common denominator and I have also heard that if your PSU is not powerful enough then it may cause this problem. I have tried reinstalling drivers and reseating the GPUs however it has not worked.

note: when i switched the GPUs in the PCI slots, one GPU was not detected

My PC specs are:
Intel extreme KDZ77RE-75K
Intel i5-3750K
G.Skill Ripjaws-X 8gb DDR3
Thermaltake 700w PSU
GTX 760 OC 4gb
GTX 760 2 gb

Any help will be greatly appreciated

 

[mickypheonix]

Hi MrR3N3
if you try each card on its own in the first pcie slot , is each card recognized on its own ?

 

[MrR3N3]

Hi MrR3N3
if you try each card on its own in the first pcie slot , is each card recognized on its own ?

hey thanks for replying, um yes both GPUs are recognized when on their own in the first PCIE slot

 

[mickypheonix]

is the option for sli available in the nvidia control panel ?

 

[MrR3N3]

is the option for sli available in the nvidia control panel ?

no there is still no option for the SLI activation

 

[mickypheonix]

this has happened to me on numerous occasions
try uninstalling anything nvidia then reinstall the latest drivers for your card
i have installed drivers and the option for sli is not there in the nvidia control panel
after uninstalling all nvidia and reinstalling the option is there , not saying this is your problem but may be worth a try

 

[MrR3N3]

this has happened to me on numerous occasions
try uninstalling anything nvidia then reinstall the latest drivers for your card
i have installed drivers and the option for sli is not there in the nvidia control panel
after uninstalling all nvidia and reinstalling the option is there , not saying this is your problem but may be worth a try

So delete the entire the Nvidia file in my HDD?

 

[mickypheonix]

yes uninstall anything Nvidia the reinstall the latest drivers for your card
edit dont delete files , go to control panel / add or remove programs and uninstall

 

[MrR3N3]

yes uninstall anything Nvidia the reinstall the latest drivers for your card
edit dont delete files , go to control panel / add or remove programs and uninstall

well i deleted the Nvidia files sorry i didnt see your edit there, i did use the uninstall programs app. After putting both GPUs in the PC and downloading the latest Driver there is still no SLI option.

 

[mickypheonix]

see if there is any update for nvidia in windows update , if not perhaps the two different memory sizes may be a problem

 

[MrR3N3]

see if there is any update for nvidia in windows update , if not perhaps the two different memory sizes may be a problem

There are no updates for Nvidia in Windows Update. Even though there is no SLI activation I still have noticed an improvement in my games. I can now run the games I play on the highest settings which i thought was wierd. Is there anyway around the memory problem? or will i just have to purchase the same size GPU?

 

[mickypheonix]

I found this quote ,
The SLI will not work if both GPUs have different vRAM amounts. For example, attempting to SLI a GTX 680 4 GB with a GTX 680 2 GB will impair the 2 GB GPU and only the primary GPU will be active. The SLI will only work if the second GPU is also a 4 GB variant.
i also hear as you have that will work on the lowest common denominator but in my experience i have never personally seen two different vram cards working in sli or proof of this , i have set up dozens of sli rigs but only ever with same gpu and vram
Perhaps another card might solve this

 

[MrR3N3]

I found this quote ,
The SLI will not work if both GPUs have different vRAM amounts. For example, attempting to SLI a GTX 680 4 GB with a GTX 680 2 GB will impair the 2 GB GPU and only the primary GPU will be active. The SLI will only work if the second GPU is also a 4 GB variant.
i also hear as you have that will work on the lowest common denominator but in my experience i have never personally seen two different vram cards working in sli or proof of this , i have set up dozens of sli rigs but only ever with same gpu and vram
Perhaps another card might solve this

alright then thanks man, I didn't expect someone to help me out so quickly.