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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?

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Do it already and post the results. –  Ярослав Рахматуллин Nov 7 '12 at 0:06
    
Fine, it worked exactly as expected, managed to get 4 5870's into one computer and started mining bitcoins on them at the same time (using poclbm) –  Callum Rogers Nov 7 '12 at 1:25
    
Wow, I've never heard of this decentralized currency concept before. This is awesome! Btw, answer your own question and throw in some details (and sources) about PCI-e being backwards compatible with PCI. –  Ярослав Рахматуллин Nov 7 '12 at 2:51
    
Oops, this question is so old I forgot to read it properly; no, I did not try putting a PCI-e into PCI, but PCI-e 16x cards into PCI-e 1x slots by heavily modifying a 1x extender. I really do not think using a gfx card via a PCI slot will work unless you heavily modify the driver it runs on. –  Callum Rogers Nov 7 '12 at 8:48

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