<< well, as far as SDRAM goes, single-sided modules overclock better...i'd imagine rimms work similarly. >>
Nope, it doesn't work the same way. The single sided modules use newer double density RDRAM that doesn't overclock nearly as well. The single-density double-sided Samsung modules are the best for overclocking by far. These are sold by Googlegear.com for $80.
Corsair may not overclock as well (if its not relabeled Samsung modules). You need not only the Samsung single density chips, but the Samsung PCB as well.