Not sure why covert24 is saying it's a transistor, it looks almost certain to be one if not two resistors. Look at the silk-screening next to that position, doesn't it look like there are marking something like "R123x" and "R123y" (x and y being numbers I can't read off the picture I saw, the first "might" be R1234).
Whether those being missing effects the card at all, significantly, or completely renders it unusable has everything to do with the function of those parts which I don't know - except that as someone already mentioned they appear to be for one of the memory chips. You may be in luck though, look on your card with it oriented like it is in the picture, roughly 12mm up it appears as though you have the same subcircuit again but laid out in a mirror image of the one below it. In the following picture it looks as though R1243 and R1247 are the corresponding parts. Going by that, if use of a magnifying glass won't allow you to get the markings to determine the values of these resistors, a multimeter may be able to measure them in-circuit, or someone skilled at soldering or with a hot air gun could pull the resistor off to measure it.
What I'd do is put the card back in a system and see if it works. There is a tiny risk doing so with a part knocked off, but it seems worth it to see if it works ok as-is. Then decide whether to find someone who will solder these back on for you, perhaps a friend would do the work for free or a couple beers (would take longer to order the two resistors if that person didn't have them on-hand, than the 2 minutes to solder them on) instead of having a shop charge $60 or more. By shop I mean electronics repair shop, a computer shop does not generally have staff qualified to do this kind of repair. A computer shop might have someone who does such things as a hobby and is quite good at it, but I would be leery of the typical tech at a computer shop claiming they do much SMD repair work, it just isn't the kind of thing a computer shop usually does nor can a shop usually afford to pay someone who has such diverse skills. I'm just saying an electronics repair shop is set up for this kind of work and does it a lot more often, though really anyone with the soldering experience and an adjustable iron with a fine enough tip could do it.
Anyway, here's the picture I was looking at when I made the above comments.
http://www.computeriseasy.com/...s/HD4000/HD4870-bk.JPG
If someone else with one of these cards can assist in identifying the part, even better the value of it or markings, that would go a long way towards fixing it.
Dorkenstein (or anyone else with a close enough match to this card willing to assist), an easier way to get a picture of something like this is to throw it on a scanner and get a zoom of the area at 600DPI or better.
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