Why do you keep talking about GPUs?
He asked about RAM, and I told him a good set.
Triple channel has been shown to run better, even by a margin, than dual channel, so why not get it if that's what he wants?
Dual-channel is the past, as of now it provides all the bandwidth necessary, but Triple Channel offers more, and you know that one day (probably not that far from now) the bandwidth of Triple Channel will be used, and the 'true' performance of Triple Channel RAM will be shown.
Anyways, he has a 4890. Nothing wrong with it.