GTX 670 Sli Configuration

Project Shinra

Honorable
Oct 1, 2013
6
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10,510
As a uni student with the itch for higher fps, but lacking in the wallet, upgrading my current GTX670 is nothing more than a distant dream. Although earlier this week a mate offered me his old GTX670 with the option to run Sli. As far as my set up being able to handle the inclusion of a new card i was curious more on the configuration level.

My current card:
*GTX670-DC2-2GD5*
https://www.asus.com/us/Graphics-Cards/GTX670DC22GD5/

New Card
*GV-N670OC-4GD*
http://www.gigabyte.us/Graphics-Card/GV-N670OC-4GD#sp

So my question lies as since they are both different brands and offer variances in Clock speeds (I know the Speeds are matched to the lowest). Also 2GB vs 4GB of ram.
- Does this mean i need two different Overclocking drivers?
- Is there a 3rd party one that handles both?
- Should i run the 4GB card as my Primary?
- Essentially what is the best way to handle this ?

I understand there is a fair amount of info on forums, but a lot dating 4+ Years old and understand a lot on the driver/Software level have changed since.

Also, Yes i know i should just upgrade to a newer card and i will be at the end of the year. Till then tho...