The wire says PCI-Express on one end. Here is what the cable looks like:

Cable

Can anyone tell me what this cable is called, and what it is used for (e.g., video card, optical drive, etc)?

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Do you have a light? They make for better photographs... – Fake Name Apr 17 '10 at 4:45
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Or even a focus button. – Josh K Apr 17 '10 at 4:57
The picture is terrible quality because I took it on my Droid. It would have been clear if I had an iPhone 3GS. Just sayin'. – user34468 Apr 17 '10 at 5:15
Lol @ Droid vs. iPhone. Do either one have a macro function? – Nathaniel Apr 17 '10 at 5:17
Not if I recall correctly. – Josh K Apr 17 '10 at 12:54
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2 Answers

It could be a 8 pin PCI-E power connector or a 8 pin motherboard connector.

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To add, those are usually used by power-hungry high-end dedicated graphics cards for supplemental power. – nhinkle Apr 17 '10 at 5:06
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I think it's an 8-pin PCI-Express cable. There's a good picture and more information here

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