Rank
Defines a set of DRAM chips (on a module) comprising 8 byte wide (64 bits) data, or 9 bytes (72 bits) with ECC. All devices in a Rank are connected by a single Chip-Select. The actual memory size is not defined. Single-sided memory modules are always Single-Rank. Double-sided unbuffered DIMMs and SODIMMs are always Dual-Rank. Server DIMMs may have up to 4 ranks.
Dual Rank
Defines 2 sets of DRAM chips (on a module) each comprised of 8 byte wide (64 bits) data, or 9 bytes (72 bits) with ECC. All devices in a Rank are connected by a single Chip-Select. The actual memory size is not defined. Normally a module will have one rank per PWB side.
Quad Rank
Defines 4 sets of DRAM chips (on a module) each comprised of 8 byte wide (64 bits) data, or 9 bytes (72 bits) with ECC. All devices in a Rank are connected by a single Chip-Select. The actual memory size is not defined. Normally a module will have two ranks per PWB side.
Had er ook nog nooit van gehood, bestaat precies wel...