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My graphics card is XFX GeForce GTS 250 1 GB. I've noticed that there is a jumper on the top of the board - top means the opposite side of the PCIe connector. The jumper is not connected. I couldn't find anything about the jumper in specs. May be it is not to be used for customers but I'm curious, what's the jumper doing on the board?

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It might not necessarily be a jumper - it might be a 2 pin connector of some sort. Is there any silkscreened letters near it? – Journeyman Geek Jan 13 at 12:00
@JourneymanGeek: not sure what is silkscreened letter, but there is no letter nearby. – Donotalo Jan 13 at 12:07
slikscreening is the process they use to put those white letters on a green, black or red circuit boards - quite often circuits have almost every part labelled to some extent, which can be useful in identification – Journeyman Geek Jan 13 at 15:24
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It's an SPDIF connector, it's so that you can stream audio through your HDMI connector.

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there is no HDMI connector on the board. what's the purpose of this SPDIF connector? where have you find this information? – Donotalo Jan 13 at 12:27
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en.wikipedia.org/wiki/S/PDIF You might not have an HDMI port on your card in which case you have a S/PDIF connector on your card, you use it if you're connecting your PC to a digital sound system or more commonly to a monitor with speakers. You could use an HDTV instead of a regular monitor, and connect it all via your graphics card. I got my information from a number of different posts on tomshardware.com and product documentation on what the included cables are used for. Some users claim that they are able to stream audio over the DVI port when using a DVI/HDMI converter. – Dwayne Hinterlang Jan 13 at 12:35
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