First of all, this is for a GPGPU project so I only need a very small amount of bandwidth. The bandwidth for PCI and PCI-e 1x slots are several orders of magnitude more than I need.
Some people have made a PCI-e 1x to PCI converter. With some simple hacks I can make a PCI-e 16x to PCI-e 1x converter.
The question is, if I plug in a GPU (Radeon 5870) into the PCI slot using this method, will it be recognised by the computer's BIOs and by the AMD fglrx proprietary driver?