For all those members who are new to Sli
So here is a step by step guide I have put together to ensure you configure and enable your SLi rig
You will need two Nvidia SLi cards which need to be the same model ie 2 x GTX460 ( but the cards do not have to be the same make)
You will also need a Sli bridge here is some examples below depending on your motherboard
Some people also get confused on with connector to put the SLi bridge it makes no difference if its placed in position 1 or 2 as per below image.
You will also need to download the latest drivers from
Nvidia or from the
Evga support site and install them on your computer.
Once your drivers and both of your cards are installed with the Sli bridge connector and power cables connected to your Gpu your ready to go.
1. To ensure Sli is enabled right click on your desktop and select the nvidia control panel
2. Once in the Nvidia control panel select
Set Sli and Physx configeruration on the Task menu on the left hand side
to enable SLi Select radial button
Maximize 3d performance as per below diagram.
For
Physx settings select the Physx drop down bar which gives you three options
1.CPU
2 GPU 1
3 GPU 2
I use my GTX480 2 as Physx but its self preference
or if you have a Physx/Gpu card for dedicated Physx select which GPU you want to use and tick the
dedicated to Physx box 
3. Ok now that we have Sli enabled we can move on to Manage 3D settings to get the best out of your cards
so select Adjust image settings with preview on the Task menu on the left hand side.
Here we have three choices.
A. Let 3D application decide
B. Use the advanced 3D image settings
C. Use my preference emhasizing Quality
Select radial button next Use the advanced 3D image settings and click
Take me there link
Now we have two tabs
Global settings and Program settings A. Global settings By adjusting global settings this will adjust all programs/and settings games used by Nvidia control panel
Its self preference what you want to set within Global settings
There is two settings I change with in
Global Settings 1st. Multi-display/mixed-GPU acceleration to
single performance mode (as I only run one screen ) now select apply button at bottom of screen
to save changes.
2nd SLi rendering mode to
Nvidia recommended now select apply button at bottom of screen
to save changes.
B. Program Settings In program settings we can add applications by selecting the add button then browse your files and add the link used for that application ie BFBC2 start up shortcut this will allow you to set the setting for each individual program.
You can also add profiles from the Nvidia website to your Nvidia control panel.
This again is self preference as most modern games have AA and AF adjusments within game
The only thing I adjust is
Sli rendering mode on my video media software and Firefox IE8 ect to
single GPU for watching video's/browsing, I also change the
Power managment mode to
Adaptive to help save on power consumption.
For BFBC2 i have
Sli rendering mode set to
Alternative rendering frame 2 and my
Power managment mode to
Prefer Maximum Performance 
4. To check whether SLI is working in your game or not, go to the
3D Settings in the horizontal menu bar at the top of your Nvidia control panel.
Check
Show Sli visual Indicator as this will enable the SLI visual indicator in 3D Applications like games.
Now close you Nvidia control panel and open a game or application you should see a green bar on the left side/middle of the screen and SLi written next to it. This means SLI is working :-)
Well I hope this has helped any members on how to enable and check enable Sli......
post edited by samarlian - 2010/10/01 03:06:42