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Bron: Silicon Insider

Silicon Insider heeft een erg goed Put Your Ass in the Known artikel over de Rambus technologie gepost. Hier een stukje:

The good news about Direct Rambus is that it is faster than current memory technology, but the bad news about Direct Rambus is it is slower than current memory technology. How can something be both faster and slower? Because there are different aspects to memory speed.

Think of the data flow out of a memory system as being similar to the baggage carrousel at an airport. The delay between the start up of the carrousel and the appearance of the first suitcase is analogous to memory latency, while the rate at which subsequent items appear out of the chute is equivalent to memory bandwidth. Direct Rambus is strong on bandwidth. In fact, data can flow in or out of each DRDRAM data pin at up to 800 million bits per second (Mbps), a rate eight times faster than today's memory standard bearer, the PC100 synchronous DRAM (SDRAM).

The bad aspect of Direct Rambus is latency. Rambus Inc. likes to say that its fastest DRDRAMs have the same 20 ns page access latency as the fastest PC100 SDRAMs. This is technically true when you consider the memory chip in isolation. But DRDRAM-based memory systems differ from SDRAM-based systems in several significant ways in how the chips are wired together and communicate with the memory controller ASIC which add tens of ns to the effective latency.

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