Can I put two cards of different models in SLI or Crossfire for example GTX 770 as first card and GTX 660 as second card and putting SLI bridge between them? or SLI and Crossfire only works with same model GPUs?
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NOO. This would never work! You have to have two card of the same make and model. Otherwise, it wouldn't work.
SLI needs the same model, but crossfire works as long as the GPUs are using the same graphics core. For example, the R9 280, 280X, HD 7970, and 7950 can all be CrossFired with each other.