If DDR3 hadn't been manipulated spiked to triple price from last year, adoption of 4 would be delayed that much more.
4 has little to nothing to do with density btw, thats all process shrinks. And 3 has been through quite a few of those already, ~20nm sure as hell wasn't around in 2007, but the ~20X larger 90nm was.
I'll take the lower voltage and higher bandwidth per clock, but only at a fair market price. I can sit and wait enough quarters for their greed to naturally cause an "oversupply" which occurs when they stop colluding and start competing, then buy it cheap before manipulation happens. Cpus aren't getting that much faster lately anyways. (gee wonder why...)
E5 1680v2 4.5Ghz - "Yes Virginia, they are unlocked"
E5 2696v4 Because Reasons™