My motherboard has an open PCI slot, and I was wondering if it would be possible to use a PCI to PCIe adapter and then a USB 1x PCIe riser to power a GPU for mining. Does the PCI slot have enough bandwidth to support running a GPU for mining?
I have never seen an adapter that will allow a PCI-E card of ANY type to be plugged into a PCI slot.
VERY VERY different standards, and PCI-E is VERY MUCH higher performance than PCI ever was.
There are a very few cards made for PCI that can mine - but they are very low performance by current standards, don't think any of them have more than about 128 "cores" and not sure if they go THAT high (48 is actually comming to mind as the top in a PCI GPU, but I might thinking of AGP).