http://i3.photobucket.com/albums/y69/patrick_le_great/100_5032.jpg

It would help to know what kind of computer it's come out of.

I figured the physical shape of it would lead one to know what type it is. There's only a couple that I know of, and I'm pretty sure there's just two that work in desktop PC's.
Like 164 pin and 200 pin or something like that. Knowing any more about the computer hopefully shouldn't be needed, as I don't know much about it, and I don't have it around to look at.
I'm not the most savvy on comps, so I may be wrong.

That is a stick of RDRam and is a SIMM - Single In-line Memory Module. They come in 30 - 72 - and 168 pin sticks. That is not a 168 pin so it is probably 72.

Dell used RDRam (168 pin) on their deminsion 8100 and I was stupid enough to buy one. They then went back to using SDram for their next year's models. But they are installed in pairs so another stick like that will be the only replacement, since the lonely twin is sitting useless w/o it. If it has a long serial number on the other side, then google that number and you may be able to find the capacity. I have never seen other than 168 pin RDRam sold anywhere so you are probably SOL on finding another. Maybe they were used in servers but I am only guessing on that.

~~~~edit

If that is a CRIMM then it has no Memery capacity and is used only to fill a memory slot for continuity since all slots must be occupied in order to allow the ram sticks to be utilized.

"The CRIMM - RDRAM RIMM 184-pin Continuity Module is used on motherboards that use RIMMs (RDRAM Modules). Each memory slot must be populated in order for the board to function. CRIMMs (Continuity Modules) are used to fill slots that do not have RDRAM installed. They act as dummy modules and allow for your motherboard to function properly."

^^ This. It's an RDRAM continuity module, which has to be installed for the computer to work but doesn't actually contain any memory.

HP used RDRAM on quite a few of their older workstations and servers too.

Yeah, it's only the placeholder, and not the memory. So am I looking for a RDRAM RIMM 184-pin Continuity Module?

-edit-
Google has helped a lot, as have you guys. Thanks, I think I'm set.