Originally posted by GilesGuthrie
Viper Zero makes 5 points about RDRAM:
1. True.
2. True.
The difference though is that DDR RAM uses some clever technology to increase the bandwidth. Basically, the system timer signals the on/off pulses that the memory uses to change state according to the data flow. RAMBUS memory has a very high speed of pulse, and so changes state on the high/low voltages. DDR instead looks for the change in the voltage rather than the voltage itself, and is therefore able to change state on the switch between low and high voltage, and then again on the switch between high and low voltage. Hence the name, Double Data Rate.
There are factions within the industry that feel that DDR RAM is inherently less reliable than RAMBUS RAM.
3. True, because of the higher clock speeds.
4. False. It's used with later Intel boards, specifically those used to handle the Coppermine processors onwards. I have a PIII/1000 on an Intel board using RDRAM.
5. False. RDRAM is expensive, but it is extremely high quality and highly reliable. It is able to perform above the level of DDR SDRAM without resorting to voltage trickery, which is more likely to induce state errors in situations of unreliable voltage. I have noted that DDR-equipped computers are significantly less reliable when deployed on construction sites than virtually identical machinery equipped with RDRAM.