That's a good point (including your previous, much longer post), as I hadn't been thinking of it as quite so similar to X86 CPU's as that, but I suppose the architecture is going to be more or less the same at some base level.
I think what is important, regarding dual-channel vs single-channel RAM in these dual-core phones is knowing if the 1GB is a single 1GB DIMM, 2x 512MB DIMMs, 4x 256MB DIMMs, etc... From my understanding, the OMAP4460 should theoretically function most efficiently if the memory is set up as two 512MB DIMMs, while the Snapdragon (despite being dual-core) will function most efficiently if it is only 1 1GB DIMM. This is due to the integrated memory controllers and their inherent limitations, which is why the fastest RAM they're putting into phones runs at ~500mhz or so, although likely with relatively low CAS timings, at least as I understand it.
This has me wondering...
If these manufacturers have yet to "master" dual-core CPU's and dual-channel memory in these phones, especially when integrated together...what kind of mess are we gonna see when the quad-core processors come out in the not-so-distant future? Take the Tegra3, with it's 4+1 core design and its 12-core GPU, limited to a dual-channel memory controller. How are 5 CPU's and 12 GPU's (17 cores, essentially) going to work with 1-2GB of dual-channel memory?
I think the BIG LEAP we're going to see is not the quad-core CPU's, the multi-multi-core GPU's, or whatever... It will be when they are able to integrate a combination of a DDR3-type RAM running as many channels as there are cores, as well as dedicated GDDR5-type memory for the GPU('s).
It's almost as if they're all trying to one-up another so badly, they're putting stuff out on the market before the last product they put out is even optimized! Imagine that!
For the record, I am an AMD/ATI guy... so your comparison seems backwards to me
