Whatever happened to RDIMM support?

[Prominence]

I recently looked into some hardware with ECC support and noticed that the mainstream Intel server processors and chipsets only support ECC UDIMM. Only Intel chipset that seems to support RDIMM is overpriced and disappointing 2011. On the otherhand, AMD consumer line all support ECC UDIMM, and ECC RDIMM support for the server hardware, but heavily lack choices.

Intel seems to be staying cheap and not implementing another memory controller and just enabling ECC on consumer processor and selling off as server processor for mid to higher end processors. I hear there are a several more benefits to registered memory when it comes to things like scalability, capacity, speed, reliability, and better investment overall, yet it seems increasingly hard to get supporting hardware. AMD is supposedly making 64 bit arm server processor that support SO-DIMM UDIMM, and Intel 2011-3 is least 9 months away from its release.

Perhaps guy who named himself dimm could answer why this is the case and give some future insight.