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SLI two GTX 580 with different VRAM sizes.

post #1 of 6
Thread Starter 
So i spent a couple hours last night working on getting my two GTX 580's (1.5 GB and 3 GB) to SLI. After a long time of browsing the interwebs i was able to piece together how to do it without modding or using modded drivers. Figured if i had this much trouble there's bound to be at least a few others out there who have the same problem so i thought id post how to make it work. BTW i am using windows 8 x64.

1. The drivers that you want are the 310.70 WHQL.

2. You will also need to download and install CoolBits 2.0

3. Once downloaded uninstall the Nvidia display driver via control panel.

4. Run the executable for the 310.70 drivers

5. Extract Coolbits 2.0 from downloads and run the exe it creates. Click allow when asked for permission to edit registry.

6. Go into regedit.exe
> locate [HKEY_LOCAL_MACHINE\SOFTWARE\NVIDIA Corporation\Global\NvTweak]

> right click on the "CoolBits"=dword:00000003 in right panel and click modify.

> Change the Value to 1A. This allows for overclocking and SLI of different VRAM sizes.

7. Restart your machine and when you log in check in Nvidia control panel and the SLI option should be there.
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post #2 of 6
SLI has always been possible with different VRAM sizes... I take it this enables full use of all VRAM?
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post #3 of 6
Quote:
Originally Posted by That Guy View Post

SLI has always been possible with different VRAM sizes...
this!
Quote:
Originally Posted by That Guy View Post

I take it this enables full use of all VRAM?
no way.
post #4 of 6
It's not something new, it's just that there's little to no point.
You lose 1.5GB on the 3GB card.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by That Guy View Post

SLI has always been possible with different VRAM sizes... I take it this enables full use of all VRAM?

Well with the new drivers I don't get an option to SLI my two cards. It shows that both are running but it wouldn't let me SLI with 314.22 or 320.18 drivers. I also found a couple posts with other people asking the same issue.
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post #6 of 6
Quote:
Originally Posted by samwise67 View Post

Well with the new drivers I don't get an option to SLI my two cards. It shows that both are running but it wouldn't let me SLI with 314.22 or 320.18 drivers. I also found a couple posts with other people asking the same issue.

I've been running the 310.70 drivers forever and now I want to update to at least the 320.18 driver so its a little more optimized for the BF4 beta.

Anyone got anything Idea to run a 2Gb and 1GB GTX 560 for the BF4 beta?
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