I'm looking at doing a processor upgrade for my S939 system and it seems like the processors for this socket are dissapearing very quickly. Has AMD killed this one off?

Unfortunately, yes, socket 939 is near death. According to this article (http://www.theinquirer.net/default.aspx?article=36046) from The Inquirer, AMD will stop taking orders at the end of the year. Some chips will remain in the retail channel for a while, but as you note they're starting to disappear already. If you do want to upgrade a 939 system, I would do so ASAP.

While AM2 is obviously the way to go for future AMD-based systems, it's odd that they're moving to kill socket 939 so soon. It may be that they're constrained by production capacity.

Shortage of AMD CPUs is often attributed to the fact that Dell is using them now.
Plus ATI aqusition. Plus quad-core. AM3 socket and probably a short-lived AM2+ in between.

Diogen.

I just did the upgrade myself
had a 3200+ and replaced it with an x2 4600+ and WOW so much nicer
was able to get the 4600+ for $250 and i'm hopping to get at least another year of life out of it.

Was going to get the 4800+ but they seem to already be all gone.

I have to say for me it was well worth the cost. I was also luck to find another guy to buy my old CPU so it's all good.

If you can find a good deal on a socket 939 opteron, that would be the best processor to get. They are essentially FX chips at lower clock speeds. (You can overclock them up to FX speeds though).

For dual-core, The Opteron 165 is the chip to get.

If you can find a good deal on a socket 939 opteron, that would be the best processor to get. They are essentially FX chips at lower clock speeds. (You can overclock them up to FX speeds though).

For dual-core, The Opteron 165 is the chip to get.
After much searching I was able to pick up an Opteron 165 today.

If anyone is considering upgrading a S939 system do so immediatelly the chips are vanishing quickly.

I would guess that AMD stopped production of socket 939 chips some time ago (probably several months) in order to convert plants to newer chips. How fast they disappear is strictly due to the number in stock and popularity of the chips. That's true of all retail channels with products that are frequently changed or upgraded. Popular products are often difficult to find and can become unavailable long before the planned date when new products become available.