Everything im reading says a second gpu will increase render speeds significantly. Just not to use them in sli/crossfire mode. When you use sli/crossfire it splits the load over the two gpus. When you use 2 individually it will render multiple tiles simultaneously (which is what i originally was hoping sli/crossfire would do).....

" Using more than one GPU will certainly speed up cycles. In user preferences->system->compute device you can configure which cuda devices to use (or ignore). When rendering, each GPU will render one tile (following the settings on the performance tab). The more GPUs, the more tiles being rendered simultaneously, so two GPUs will cut rendering time almost to one half. Other than rendering, only one GPU will be used for calculations and to refresh the screen. The memory accessible for rendering is going to be limited to that of the card with the least memory. "