Bij DeezTech is een interessant artikel online gezet waarin Rambus DRAM en DDR SDRAM met elkaar worden vergeleken. In dit artikel, wat erg positief is over DDR SDRAM, worden eerst de 'standaard' voor- en nadelen opgenoemd (RDRAM heeft een hoge latency en hoge kosten, DDR SDRAM is makkelijk en goedkoop om te maken en wordt niet zo heet) en wordt daarna wat dieper ingegaan op de stof en op toekomstige geheugen-technologieŽn (DDR II en QDR). ook wordt er nog wat gezegd over de rechtszaken die Rambus Inc. de laatste tijd aanspant tegen geheugenfabrikanten:
DDR SDRAM is popular with memory manufacturers for perhaps obvious reasons: it's easy to make and they already have most of the equipment to make it (if they aren't producing it already). They also don't have to pay to license the memory technology like they do with Rambus. Or do they? Not long ago Rambus sued Hitachi for failing to pay royalty fees for SDRAM.
That's right- it seems that Rambus owns patents for technology critical to SDRAM and DDR SDRAM, and is now trying to charge royalties for it. For those of you fairly new to the PC industry, the filing of an IP (intellectual property) lawsuit is often an excellent demonstration that a company's product sucks or it's otherwise getting its proverbial ass kicked. An acquaintance of mine once commented that his new video card was going to be based on nVidia's TNT video chipset, his reasoning being that since all the other video companies were suing nVidia, their products must be great.
His statement had a perverse truth to it. Rambus' memory is far from popular, so because they can't compete in price they're trying to hurt everyone in the courtroom. Their plan is to charge the lowest licensing fees for regular SDRAM, higher fees for their own Rambus memory, and not surprisingly, the highest fees for their (hopefully) nemesis-to-be DDR SDRAM. Toshiba agreed to license SDRAM and DDR SDRAM from them a few days ago, and Hitachi has, after being on the receiving end of much litigation from Rambus, also worked out an agreement with them.
Recently Micron has stated that it won't cave in to Rambus' demands, so its fight with Rambus will surely continue for a while. The other memory manufacturers have taken no action yet, but Rambus has not yet sued them. Certainly this is all bad for SDRAM and DDR because it will increase their end price, but I still doubt seriously that Rambus memory will ever gain price/performance parity with DDR SDRAM. Several benchmarks have demonstrated that DDR SDRAM is superior to even dual-channel Rambus in almost all respects, so Rambus has good reason to try to make it expensive as possible by charging the highest licensing fees for it.
Met dank aan Venator voor de tip.