flashmonkey said:
How much of a difference does that actually make when using the PC? (Gaming, multi-tasking, video editing etc.)
The difference between registered memory and unbuffered memory is the additional hardware to increase consistency and predictability of the address and data tranmission paths however it was made.
Registered memory is addressed by the CPUs or the Controllers through an additional set of registers, the registers remained the same input impedances to the CPUs and to the Controllers however the memory was made, be it Single-Sided or Double-Sided, 4 chips or 10 chips or 50 chips construction.
Unbuffered memory have varied input impedance depending upon their construction, Single-Sided and Double-Sided have widely varied input impedance from each other.
When using them
properly within their limits, there is no difference between them whatsoever for using the PC (Gaming, multi-tasking, video editing etc). Simply expect that there is additional latency introduced by add-on registers in trade for address and data tranmission path greater consistency and more predictable quality despite their varied constructions.
If you are an OC'er - Registered memory additional latency caused slight loss of maximum possible data throughput, mobos using registered memory normally were not made with overclocking in mind as that is definitely not a recipe for consistency and predictability.