Sorry to burst your bubble but 939 is dead. AMD has already announced that they are no longer producing socket 939 chips. The CPUs and Motherboards for 939 that are on the market right now are all there will be. Maximum PC Magazine did a nice little obituary for socket 939. I believe it was the January or February issue.
I was talking about upgrading a 939 system a person might already own.
In such a case right now you can get a very effective bang for your buck.
I have no doubt that given the cost of not needing to buy all the new MB/CPU/RAM/GFX/PSU and moniter that any such upgraded system will run most anything a home user could run for years to come untill parts failure or a real life need for hardware forced by the majority of software sold.
If a person already owns an "older" 939 and was thinking of "something better" right now is a good time to get an Optron and RAM upgrade that will carry them for years for very little money....while they can do so.
The same would apply to older Intel units as prices on some good value CPU's have dropped.
Funny how when we think of "old hardware" we are often talking about items no older than three years and often a CPU upgrade to high end on those systems replace parts whose "then" costs a person might build a whole system for today.