all s939 can run single channel?

[her34]

can all s939 boards run single channel, or does ram have to always be dual channel (only 2 or 4 sticks)?

 

[ts3433]

You can certainly run single channel, but some boards do have trouble booting with three memory modules under any circumstances.

 

[Geomagick]

Read your manual closely to check which DIMM to install first. I know on the A8N its the third one from the CPU, but for others I couldn't say.

 

[hawksballer]

yes it can run with one but I have not tried 3

 

[Rand]

Any S939 board should run perfectly in single channel.... you'll see roughly a 5% performance hit in most instances so it's not too bad. Whether you can utilize 3 DIMM's depends on the board in question, some will handle it, whereas others won't. If you do use 3 DIMM's it'll be forced to run in single channel though.
You'll need 2 or 4 DIMM's for DualChannel operation.