Hopefully I am not too late with the reply but, if the PCI 1x Slot Cards are small then yes, you can put plug them in but, the free slot that is next to the graphics card is going to be right next to the card and it could block airflow so if you really want two pci 1x cards and are willing to give up some airflow then yea this should be fine.
Just tried it, it didn't reach it and it wouldn't have been able to fit through the gap :P
All fps tests with 1080p monitor
Arma 2 maxed out with at least 30 fps
Borderlands 1 & 2 maxed with over 60 fps
counter -strike maxed out with 2.0x dsr over 100 fps
Max Payne 3 maxed out averaging fps of 50
I saw one at micro center and they cost quite a bit too much for me, but still thanks for the recommendation.
I know right! I don't know what i'll upgrade first and thanks!