Doing SLI with an outdated performance GPU is NEVER EVER a good idea. Just NEVER.
SLI brings more problems than it solves and an outdated GPU will not give you the performance boost you may want.
To name a few reasons:
- Extended power only usable when the game has an SLI profile, meaning newer games without it will not be playable at first
- Missing features of newer cards will drag you down
- Inefficient power usage
- Not nearly enough VRAM. You have to considered that even though the power doubles, your VRAM does not. A card with the power of 2x570 and just 1.2GB VRAM is a joke
The only time I can recommnd any form of SLI/CF is when the power of the currently strongest GPU on the market is not enough and you need multiples of that.
If it is about budget go with the best AMD card you can currently get for your money.
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