So I got a tower that has 1PCIe x16 and 2 PCIe x1s. I already got a good NVIDA GTX 650 Ti BOOST card (yeah I know I should use AMD but apparently it wasn't compatible). That is giving me around 70MH/s.

I am wondering how const-effective it would be to get two PCIe 1s. Has anyone used a small GPU like this with any success? What kind of performance is possible out of a PCIe 1?

Thanks!