Not quite true.
Yes, the 939 does support Dual Channel Ram and the 754 doesnt.
There are still differences other than that. For example, the Socket 939 is futureproof, which means you most likely don't have to buy a new motherboard if you decide to buy a dualcore amd processor later this year. Also, there are processors with the Winchester Core (90nm instead 130nm Newcastle). The lower nm allows the processor to consume lesser power which means it runs cooler. Plus Winchester CPUs are like 4% faster than Newcastle ones. Considering theres no price difference between them, go for the 90nm winchester by all means.
Conclusion: DO NOT get a Socket 754 motherboard because it's a dead socket. AMD doesn't make new CPUs for it so you 3700+ max which costs quite a lot.
Get the 939'r and I'd suggest you to get a CPU with winchester core. (So far, only 3000+,3200+, 3500+).
Lastly, the motherboards.
There are quite a few good out now. The majority of the mobo makes have nForce 4 built in which is NOT a bad thing. It performes a lot (~5-7%) better then a nForce 3 chipset and the story about so many problems is not true anymore.
Asus has two mainboards for the 939 out which are in an awesome quality. One supporting SLI and Dual Raid, the other without Dual Raid. However, MSI is good too and performes about the same as the Asus mobos.
I am not quite sure about the quality of the VIA chipsets but I know they perform some percents lesser. Plus if you want to overclock, nForce is the way to go. Also, 939'r cpus with winchester core are best for overclock because of the lesser power consumption what makes the cpu run cooler.
Bottom Line:
754 is old stuff, don't get it unless you want to upgrade in less then a year again. The 939 is futureproof (940 is a server socket, although there was a fx53 out for it, so I let it out). Mainboards, I'd either go the Asus or MSI way but there are other good makes out there. I'd however go for a nForce chipset for sure.
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