Rambus
 

Where is the Rambus used on is it used for PC memory as in RAM?

Yes, RAMBUS is used as RAM. There are different types of RAM. SDR (Single Data Rate) is your normal PC33/66/100/133. DDR (Double Data Rate) is better because works on both the rise and fall of the clock tick. RAMBUS, I believe, is similar to DDR but very different (I know it sounds odd to put it like that). It was used on the early P4 machines but it never really took off and now most thing use DDR instead of RAMBUS.

HTH

cool thanks

Rambus is a company, RDRAM is the RAM and it is what you might call QDR, if I am not mistaken. Much like the Pentium 4 processors bus clock, it triggers at a low voltage on the rising edge, a high voltage on the rising edge, a high voltage on the falling edge, and then a low voltage on the falling edge of the clock. This gives it 4 operations per actual clock cycle. Which means a 100Mhz. RDRAM part puts out the bandwidth of a 400Mhz. Regular SDR SDRAM part. Which means it can push some serious bandwidth without a needing a ridiculously high frequency clock. It is also why it matched so well with the Pentium 4 in Intels mind. However RAMBUS the company (which never actually builds anything) went screaming intellectual property on everyone and the cost of the memory went sky high. They backed down on a promise they made when attending a standards body meeting on SDRAM patents and tried to bully the memory makers so many refused to manufacture RDRAM.

Plus RDRAM has a very high latency because the memory chips weren't up to the task of feeding the bus so they are constantly behind the requests.