Not sure, but mine is certainly more stable with one memory module in than two.
I forgot to mention this on the molk discussion, but it crashes more often with two than one, so I bought a pair of 1gb modules to replace the 512Mb's I had in thinking I had a bad module as suggested by people discussing molk crashes, and it still crashes even with the new unboxed ram, but only if I put both in. If I put one in, its stable with 1gb of ram. I think the board has issues when bank switching between the two modules...
I was thinking about getting it ONE 2gb module and sticking with that but, a gig of ram is enough really, especially since knoppix falls on its face if you define ram as > 512M at boot because of a bug in the linux ppc memory handling code...

Bit buggy, but thats why the price was so cheap (I paid less than the memory + ssd cost for my system).