Implementations
Intel has adopted the technology for their Xeon 5000/5100 series and beyond, which they consider "a long-term strategic direction for servers".
Sun Microsystems is using FB-DIMMs for the Niagara II (UltraSparc T2) server processor.
Intel's enthusiast system platform Skulltrail uses FB-DIMMs for their dual CPU socket, multi-GPU system.
FB-DIMMS have 240 pins and are the same total length as other DDR DIMMs but differ by having indents on both ends within the slot.
The cost of FB-DIMM memory was initially much higher than registered DIMM, which may be one of the factors behind its current level of acceptance. Also, the AMB chip dissipates considerable heat, leading to additional cooling problems. Although strenuous efforts were made to minimize delay in the AMB, there is some noticeable cost in memory access latency.
Read more about this topic: Fully Buffered DIMM