The majority of DDR3 sold today is in pairs, i.e. dual channel kits. All that means though is that they've been tested together. So something marketed as tri-channel is basically the same product, except there happens to be three sticks in the pack that have been tested together, and so forth. There is no such thing as a dual(or whatever)-channel stick of RAM, the terminology only applies to the kits.
At the consumer level, tri-channel was mainly used for the first get i7-9xx Nehalems, and quad-channel is in the current high end SB-E and forthcoming IB-E platforms, so there's not much market for them.
As far as consumer advice goes, memory frequency really only matters when using integrated graphics, and latency, well, it's really of trivial effect for anything. Still, better rated memory tends to indicate that it's further away from its theoretical limit, and therefore can be said to be potentially more reliable.
So to answer the direct question: Will anything called DDR3 do? The answer is a qualified yes. As in, it'll almost certainly work, but some of them will mean running your system out of spec, which may technically invalidate your warranty if anything goes wrong. Neither Intel or Asus will support you using 1.65V memory, whilst on the other hand, Asus will support the higher RAM frequencies marked 'OC', even if Intel do not
Edited by Humanoid, 31 July 2013 - 01:16 AM.