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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 88.05+1.0%3:59 PM EST
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To: tinkershaw who wrote (75177)6/29/2001 8:05:58 PM
From: Dan3  Read Replies (1) of 93625
 
Re: But the fact that someone had the gaul to say that SDRAM100 is "faster" memory than RDRAM...

Were you thinking of this post?
RDRAM isn't fast memory at all, it's actually slower than SDRAM 133 - what it does is to compress a very wide bus onto relatively few pins.
Message 16011167

You'd better go back and read it again. And read some of the documents on Samsung's, Rambus's, and other sites until you understand them. Because the memory in RDRAM memory runs at 100MHZ - so the memory in PC133 SDRAM is faster - and DDR memory is much faster.

The benefits and drawbacks of RDRAM all come from the way it collects data from 8 (relatively) slow memory cells, puts in into a packet on the chip itself, then squirts it out at high speed (the 800MHZ part of Rambus). After that, the packet has to be converted back into 8 bits again - which takes a little bit of time.

There are good effects and bad effects from this. The good effect is that RDRAM gets the same effective bus width from 32 traces on the motherboard (16 in and 16 out) as SDRAM DDR
gets from 128. So if you need more than 64 bits in a row, (the width of SDRAM/DDR busses) RDRAM moves that "high volume" of memory faster - that's bandwidth. But if you just need to know what value is stored at a particular address, then SDRAM/DDR is faster because, well, it's faster. You just don't get as much in each "chunk" read.

You have to understand this much, or none of the discussion on Rambus will make any sense.

Dan
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